1 | //---------------------------------------------------------------------------- |
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2 | // user_logic.v |
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3 | //---------------------------------------------------------------------------- |
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4 | // |
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5 | // *************************************************************************** |
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6 | // ** Copyright (c) 1995-2011 Xilinx, Inc. All rights reserved. ** |
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7 | // ** ** |
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8 | // ** Xilinx, Inc. ** |
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9 | // ** XILINX IS PROVIDING THIS DESIGN, CODE, OR INFORMATION "AS IS" ** |
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10 | // ** AS A COURTESY TO YOU, SOLELY FOR USE IN DEVELOPING PROGRAMS AND ** |
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11 | // ** SOLUTIONS FOR XILINX DEVICES. BY PROVIDING THIS DESIGN, CODE, ** |
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12 | // ** OR INFORMATION AS ONE POSSIBLE IMPLEMENTATION OF THIS FEATURE, ** |
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13 | // ** APPLICATION OR STANDARD, XILINX IS MAKING NO REPRESENTATION ** |
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14 | // ** THAT THIS IMPLEMENTATION IS FREE FROM ANY CLAIMS OF INFRINGEMENT, ** |
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15 | // ** AND YOU ARE RESPONSIBLE FOR OBTAINING ANY RIGHTS YOU MAY REQUIRE ** |
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16 | // ** FOR YOUR IMPLEMENTATION. XILINX EXPRESSLY DISCLAIMS ANY ** |
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17 | // ** WARRANTY WHATSOEVER WITH RESPECT TO THE ADEQUACY OF THE ** |
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18 | // ** IMPLEMENTATION, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OR ** |
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19 | // ** REPRESENTATIONS THAT THIS IMPLEMENTATION IS FREE FROM CLAIMS OF ** |
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20 | // ** INFRINGEMENT, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS ** |
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21 | // ** FOR A PARTICULAR PURPOSE. ** |
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22 | // ** ** |
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23 | // *************************************************************************** |
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24 | // |
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25 | //---------------------------------------------------------------------------- |
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26 | // Modifications from base template Copyright (c) 2012 Mango Communications |
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27 | // Distributed under the terms of the WARP open-source license |
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28 | // http://warp.rice.edu/license |
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29 | //---------------------------------------------------------------------------- |
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30 | // Naming Conventions: |
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31 | // active low signals: "*_n" |
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32 | // clock signals: "clk", "clk_div#", "clk_#x" |
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33 | // reset signals: "rst", "rst_n" |
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34 | // generics: "C_*" |
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35 | // user defined types: "*_TYPE" |
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36 | // state machine next state: "*_ns" |
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37 | // state machine current state: "*_cs" |
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38 | // combinatorial signals: "*_com" |
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39 | // pipelined or register delay signals: "*_d#" |
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40 | // counter signals: "*cnt*" |
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41 | // clock enable signals: "*_ce" |
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42 | // internal version of output port: "*_i" |
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43 | // device pins: "*_pin" |
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44 | // ports: "- Names begin with Uppercase" |
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45 | // processes: "*_PROCESS" |
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46 | // component instantiations: "<ENTITY_>I_<#|FUNC>" |
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47 | //---------------------------------------------------------------------------- |
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48 | |
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49 | module user_logic |
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50 | ( |
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51 | // -- ADD USER PORTS BELOW THIS LINE --------------- |
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52 | RFA_AD_spi_sclk, |
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53 | RFA_AD_spi_cs_n, |
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54 | RFA_AD_spi_sdio, |
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55 | RFA_AD_reset_n, |
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56 | |
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57 | RFB_AD_spi_sclk, |
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58 | RFB_AD_spi_cs_n, |
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59 | RFB_AD_spi_sdio, |
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60 | RFB_AD_reset_n, |
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61 | |
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62 | // -- ADD USER PORTS ABOVE THIS LINE --------------- |
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63 | |
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64 | // -- DO NOT EDIT BELOW THIS LINE ------------------ |
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65 | // -- Bus protocol ports, do not add to or delete |
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66 | Bus2IP_Clk, // Bus to IP clock |
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67 | Bus2IP_Reset, // Bus to IP reset |
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68 | Bus2IP_Addr, // Bus to IP address bus |
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69 | Bus2IP_Data, // Bus to IP data bus |
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70 | Bus2IP_BE, // Bus to IP byte enables |
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71 | Bus2IP_RdCE, // Bus to IP read chip enable |
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72 | Bus2IP_WrCE, // Bus to IP write chip enable |
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73 | IP2Bus_Data, // IP to Bus data bus |
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74 | IP2Bus_RdAck, // IP to Bus read transfer acknowledgement |
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75 | IP2Bus_WrAck, // IP to Bus write transfer acknowledgement |
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76 | IP2Bus_Error // IP to Bus error response |
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77 | // -- DO NOT EDIT ABOVE THIS LINE ------------------ |
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78 | ); // user_logic |
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79 | |
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80 | // -- ADD USER PARAMETERS BELOW THIS LINE ------------ |
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81 | |
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82 | // -- ADD USER PARAMETERS ABOVE THIS LINE ------------ |
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83 | |
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84 | // -- DO NOT EDIT BELOW THIS LINE -------------------- |
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85 | // -- Bus protocol parameters, do not add to or delete |
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86 | parameter C_SLV_DWIDTH = 32; |
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87 | parameter C_NUM_REG = 16; |
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88 | // -- DO NOT EDIT ABOVE THIS LINE -------------------- |
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89 | |
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90 | // -- ADD USER PORTS BELOW THIS LINE ----------------- |
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91 | output RFA_AD_spi_sclk; |
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92 | output RFA_AD_spi_cs_n; |
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93 | inout RFA_AD_spi_sdio; |
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94 | output RFA_AD_reset_n; |
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95 | |
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96 | |
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97 | output RFB_AD_spi_sclk; |
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98 | output RFB_AD_spi_cs_n; |
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99 | inout RFB_AD_spi_sdio; |
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100 | output RFB_AD_reset_n; |
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101 | // -- ADD USER PORTS ABOVE THIS LINE ----------------- |
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102 | |
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103 | // -- DO NOT EDIT BELOW THIS LINE -------------------- |
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104 | // -- Bus protocol ports, do not add to or delete |
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105 | input Bus2IP_Clk; |
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106 | input Bus2IP_Reset; |
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107 | input [0 : 31] Bus2IP_Addr; |
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108 | input [0 : C_SLV_DWIDTH-1] Bus2IP_Data; |
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109 | input [0 : C_SLV_DWIDTH/8-1] Bus2IP_BE; |
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110 | input [0 : C_NUM_REG-1] Bus2IP_RdCE; |
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111 | input [0 : C_NUM_REG-1] Bus2IP_WrCE; |
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112 | output [0 : C_SLV_DWIDTH-1] IP2Bus_Data; |
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113 | output IP2Bus_RdAck; |
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114 | output IP2Bus_WrAck; |
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115 | output IP2Bus_Error; |
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116 | // -- DO NOT EDIT ABOVE THIS LINE -------------------- |
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117 | |
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118 | //---------------------------------------------------------------------------- |
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119 | // Implementation |
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120 | //---------------------------------------------------------------------------- |
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121 | |
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122 | // --USER nets declarations added here, as needed for user logic |
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123 | |
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124 | // Nets for user logic slave model s/w accessible register example |
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125 | reg [0 : C_SLV_DWIDTH-1] slv_reg0; |
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126 | reg [0 : C_SLV_DWIDTH-1] slv_reg1; |
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127 | reg [0 : C_SLV_DWIDTH-1] slv_reg2; |
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128 | reg [0 : C_SLV_DWIDTH-1] slv_reg3; |
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129 | reg [0 : C_SLV_DWIDTH-1] slv_reg4; |
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130 | reg [0 : C_SLV_DWIDTH-1] slv_reg5; |
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131 | reg [0 : C_SLV_DWIDTH-1] slv_reg6; |
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132 | reg [0 : C_SLV_DWIDTH-1] slv_reg7; |
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133 | reg [0 : C_SLV_DWIDTH-1] slv_reg8; |
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134 | reg [0 : C_SLV_DWIDTH-1] slv_reg9; |
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135 | reg [0 : C_SLV_DWIDTH-1] slv_reg10; |
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136 | reg [0 : C_SLV_DWIDTH-1] slv_reg11; |
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137 | reg [0 : C_SLV_DWIDTH-1] slv_reg12; |
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138 | reg [0 : C_SLV_DWIDTH-1] slv_reg13; |
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139 | reg [0 : C_SLV_DWIDTH-1] slv_reg14; |
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140 | reg [0 : C_SLV_DWIDTH-1] slv_reg15; |
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141 | wire [0 : 15] slv_reg_write_sel; |
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142 | wire [0 : 15] slv_reg_read_sel; |
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143 | reg [0 : C_SLV_DWIDTH-1] slv_ip2bus_data; |
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144 | wire slv_read_ack; |
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145 | wire slv_write_ack; |
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146 | integer byte_index, bit_index; |
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147 | |
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148 | // --USER logic implementation added here |
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149 | |
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150 | // ------------------------------------------------------ |
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151 | // Example code to read/write user logic slave model s/w accessible registers |
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152 | // |
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153 | // Note: |
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154 | // The example code presented here is to show you one way of reading/writing |
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155 | // software accessible registers implemented in the user logic slave model. |
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156 | // Each bit of the Bus2IP_WrCE/Bus2IP_RdCE signals is configured to correspond |
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157 | // to one software accessible register by the top level template. For example, |
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158 | // if you have four 32 bit software accessible registers in the user logic, |
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159 | // you are basically operating on the following memory mapped registers: |
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160 | // |
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161 | // Bus2IP_WrCE/Bus2IP_RdCE Memory Mapped Register |
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162 | // "1000" C_BASEADDR + 0x0 |
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163 | // "0100" C_BASEADDR + 0x4 |
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164 | // "0010" C_BASEADDR + 0x8 |
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165 | // "0001" C_BASEADDR + 0xC |
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166 | // |
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167 | // ------------------------------------------------------ |
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168 | |
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169 | assign slv_reg_write_sel = Bus2IP_WrCE[0:15]; |
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170 | assign slv_reg_read_sel = Bus2IP_RdCE[0:15]; |
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171 | |
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172 | //Removed [1] from _ack list, so ack can be delayed following write to SPI Tx register |
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173 | assign slv_write_ack = Bus2IP_WrCE[0] || Bus2IP_WrCE[2] || Bus2IP_WrCE[3] || Bus2IP_WrCE[4] || Bus2IP_WrCE[5] || Bus2IP_WrCE[6] || Bus2IP_WrCE[7] || Bus2IP_WrCE[8] || Bus2IP_WrCE[9] || Bus2IP_WrCE[10] || Bus2IP_WrCE[11] || Bus2IP_WrCE[12] || Bus2IP_WrCE[13] || Bus2IP_WrCE[14] || Bus2IP_WrCE[15]; |
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174 | assign slv_read_ack = Bus2IP_RdCE[0] || Bus2IP_RdCE[1] || Bus2IP_RdCE[2] || Bus2IP_RdCE[3] || Bus2IP_RdCE[4] || Bus2IP_RdCE[5] || Bus2IP_RdCE[6] || Bus2IP_RdCE[7] || Bus2IP_RdCE[8] || Bus2IP_RdCE[9] || Bus2IP_RdCE[10] || Bus2IP_RdCE[11] || Bus2IP_RdCE[12] || Bus2IP_RdCE[13] || Bus2IP_RdCE[14] || Bus2IP_RdCE[15]; |
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175 | |
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176 | // implement slave model register(s) |
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177 | always @( posedge Bus2IP_Clk ) |
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178 | begin: SLAVE_REG_WRITE_PROC |
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179 | |
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180 | if ( Bus2IP_Reset == 1 ) |
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181 | begin |
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182 | slv_reg0 <= 0; |
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183 | slv_reg1 <= 0; |
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184 | slv_reg2 <= 0; |
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185 | slv_reg3 <= 0; |
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186 | slv_reg4 <= 0; |
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187 | slv_reg5 <= 0; |
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188 | slv_reg6 <= 0; |
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189 | slv_reg7 <= 0; |
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190 | slv_reg8 <= 0; |
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191 | slv_reg9 <= 0; |
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192 | slv_reg10 <= 0; |
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193 | slv_reg11 <= 0; |
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194 | slv_reg12 <= 0; |
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195 | slv_reg13 <= 0; |
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196 | slv_reg14 <= 0; |
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197 | slv_reg15 <= 0; |
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198 | end |
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199 | else |
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200 | case ( slv_reg_write_sel ) |
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201 | 16'b1000000000000000 : |
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202 | for ( byte_index = 0; byte_index <= (C_SLV_DWIDTH/8)-1; byte_index = byte_index+1 ) |
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203 | if ( Bus2IP_BE[byte_index] == 1 ) |
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204 | for ( bit_index = byte_index*8; bit_index <= byte_index*8+7; bit_index = bit_index+1 ) |
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205 | slv_reg0[bit_index] <= Bus2IP_Data[bit_index]; |
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206 | 16'b0100000000000000 : |
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207 | for ( byte_index = 0; byte_index <= (C_SLV_DWIDTH/8)-1; byte_index = byte_index+1 ) |
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208 | if ( Bus2IP_BE[byte_index] == 1 ) |
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209 | for ( bit_index = byte_index*8; bit_index <= byte_index*8+7; bit_index = bit_index+1 ) |
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210 | slv_reg1[bit_index] <= Bus2IP_Data[bit_index]; |
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211 | 16'b0010000000000000 : |
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212 | for ( byte_index = 0; byte_index <= (C_SLV_DWIDTH/8)-1; byte_index = byte_index+1 ) |
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213 | if ( Bus2IP_BE[byte_index] == 1 ) |
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214 | for ( bit_index = byte_index*8; bit_index <= byte_index*8+7; bit_index = bit_index+1 ) |
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215 | slv_reg2[bit_index] <= Bus2IP_Data[bit_index]; |
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216 | 16'b0001000000000000 : |
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217 | for ( byte_index = 0; byte_index <= (C_SLV_DWIDTH/8)-1; byte_index = byte_index+1 ) |
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218 | if ( Bus2IP_BE[byte_index] == 1 ) |
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219 | for ( bit_index = byte_index*8; bit_index <= byte_index*8+7; bit_index = bit_index+1 ) |
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220 | slv_reg3[bit_index] <= Bus2IP_Data[bit_index]; |
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221 | 16'b0000100000000000 : |
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222 | for ( byte_index = 0; byte_index <= (C_SLV_DWIDTH/8)-1; byte_index = byte_index+1 ) |
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223 | if ( Bus2IP_BE[byte_index] == 1 ) |
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224 | for ( bit_index = byte_index*8; bit_index <= byte_index*8+7; bit_index = bit_index+1 ) |
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225 | slv_reg4[bit_index] <= Bus2IP_Data[bit_index]; |
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226 | 16'b0000010000000000 : |
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227 | for ( byte_index = 0; byte_index <= (C_SLV_DWIDTH/8)-1; byte_index = byte_index+1 ) |
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228 | if ( Bus2IP_BE[byte_index] == 1 ) |
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229 | for ( bit_index = byte_index*8; bit_index <= byte_index*8+7; bit_index = bit_index+1 ) |
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230 | slv_reg5[bit_index] <= Bus2IP_Data[bit_index]; |
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231 | 16'b0000001000000000 : |
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232 | for ( byte_index = 0; byte_index <= (C_SLV_DWIDTH/8)-1; byte_index = byte_index+1 ) |
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233 | if ( Bus2IP_BE[byte_index] == 1 ) |
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234 | for ( bit_index = byte_index*8; bit_index <= byte_index*8+7; bit_index = bit_index+1 ) |
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235 | slv_reg6[bit_index] <= Bus2IP_Data[bit_index]; |
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236 | 16'b0000000100000000 : |
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237 | for ( byte_index = 0; byte_index <= (C_SLV_DWIDTH/8)-1; byte_index = byte_index+1 ) |
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238 | if ( Bus2IP_BE[byte_index] == 1 ) |
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239 | for ( bit_index = byte_index*8; bit_index <= byte_index*8+7; bit_index = bit_index+1 ) |
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240 | slv_reg7[bit_index] <= Bus2IP_Data[bit_index]; |
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241 | 16'b0000000010000000 : |
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242 | for ( byte_index = 0; byte_index <= (C_SLV_DWIDTH/8)-1; byte_index = byte_index+1 ) |
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243 | if ( Bus2IP_BE[byte_index] == 1 ) |
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244 | for ( bit_index = byte_index*8; bit_index <= byte_index*8+7; bit_index = bit_index+1 ) |
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245 | slv_reg8[bit_index] <= Bus2IP_Data[bit_index]; |
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246 | 16'b0000000001000000 : |
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247 | for ( byte_index = 0; byte_index <= (C_SLV_DWIDTH/8)-1; byte_index = byte_index+1 ) |
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248 | if ( Bus2IP_BE[byte_index] == 1 ) |
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249 | for ( bit_index = byte_index*8; bit_index <= byte_index*8+7; bit_index = bit_index+1 ) |
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250 | slv_reg9[bit_index] <= Bus2IP_Data[bit_index]; |
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251 | 16'b0000000000100000 : |
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252 | for ( byte_index = 0; byte_index <= (C_SLV_DWIDTH/8)-1; byte_index = byte_index+1 ) |
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253 | if ( Bus2IP_BE[byte_index] == 1 ) |
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254 | for ( bit_index = byte_index*8; bit_index <= byte_index*8+7; bit_index = bit_index+1 ) |
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255 | slv_reg10[bit_index] <= Bus2IP_Data[bit_index]; |
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256 | 16'b0000000000010000 : |
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257 | for ( byte_index = 0; byte_index <= (C_SLV_DWIDTH/8)-1; byte_index = byte_index+1 ) |
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258 | if ( Bus2IP_BE[byte_index] == 1 ) |
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259 | for ( bit_index = byte_index*8; bit_index <= byte_index*8+7; bit_index = bit_index+1 ) |
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260 | slv_reg11[bit_index] <= Bus2IP_Data[bit_index]; |
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261 | 16'b0000000000001000 : |
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262 | for ( byte_index = 0; byte_index <= (C_SLV_DWIDTH/8)-1; byte_index = byte_index+1 ) |
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263 | if ( Bus2IP_BE[byte_index] == 1 ) |
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264 | for ( bit_index = byte_index*8; bit_index <= byte_index*8+7; bit_index = bit_index+1 ) |
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265 | slv_reg12[bit_index] <= Bus2IP_Data[bit_index]; |
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266 | 16'b0000000000000100 : |
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267 | for ( byte_index = 0; byte_index <= (C_SLV_DWIDTH/8)-1; byte_index = byte_index+1 ) |
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268 | if ( Bus2IP_BE[byte_index] == 1 ) |
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269 | for ( bit_index = byte_index*8; bit_index <= byte_index*8+7; bit_index = bit_index+1 ) |
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270 | slv_reg13[bit_index] <= Bus2IP_Data[bit_index]; |
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271 | 16'b0000000000000010 : |
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272 | for ( byte_index = 0; byte_index <= (C_SLV_DWIDTH/8)-1; byte_index = byte_index+1 ) |
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273 | if ( Bus2IP_BE[byte_index] == 1 ) |
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274 | for ( bit_index = byte_index*8; bit_index <= byte_index*8+7; bit_index = bit_index+1 ) |
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275 | slv_reg14[bit_index] <= Bus2IP_Data[bit_index]; |
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276 | 16'b0000000000000001 : |
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277 | for ( byte_index = 0; byte_index <= (C_SLV_DWIDTH/8)-1; byte_index = byte_index+1 ) |
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278 | if ( Bus2IP_BE[byte_index] == 1 ) |
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279 | for ( bit_index = byte_index*8; bit_index <= byte_index*8+7; bit_index = bit_index+1 ) |
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280 | slv_reg15[bit_index] <= Bus2IP_Data[bit_index]; |
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281 | default : ; |
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282 | endcase |
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283 | |
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284 | end // SLAVE_REG_WRITE_PROC |
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285 | |
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286 | wire [0:7] RFA_AD_spi_rx_byte; |
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287 | wire [0:7] RFB_AD_spi_rx_byte; |
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288 | |
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289 | // implement slave model register read mux |
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290 | always @* //( slv_reg_read_sel or slv_reg0 or slv_reg1 or slv_reg2 or slv_reg3 or slv_reg4 or slv_reg5 or slv_reg6 or slv_reg7 or slv_reg8 or slv_reg9 or slv_reg10 or slv_reg11 or slv_reg12 or slv_reg13 or slv_reg14 or slv_reg15 ) |
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291 | begin: SLAVE_REG_READ_PROC |
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292 | |
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293 | case ( slv_reg_read_sel ) |
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294 | 16'b1000000000000000 : slv_ip2bus_data <= slv_reg0; |
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295 | 16'b0100000000000000 : slv_ip2bus_data <= slv_reg1; |
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296 | 16'b0010000000000000 : slv_ip2bus_data <= {16'b0, RFB_AD_spi_rx_byte, RFA_AD_spi_rx_byte}; |
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297 | 16'b0001000000000000 : slv_ip2bus_data <= slv_reg3; |
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298 | 16'b0000100000000000 : slv_ip2bus_data <= slv_reg4; |
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299 | 16'b0000010000000000 : slv_ip2bus_data <= slv_reg5; |
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300 | 16'b0000001000000000 : slv_ip2bus_data <= slv_reg6; |
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301 | 16'b0000000100000000 : slv_ip2bus_data <= slv_reg7; |
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302 | 16'b0000000010000000 : slv_ip2bus_data <= slv_reg8; |
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303 | 16'b0000000001000000 : slv_ip2bus_data <= slv_reg9; |
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304 | 16'b0000000000100000 : slv_ip2bus_data <= slv_reg10; |
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305 | 16'b0000000000010000 : slv_ip2bus_data <= slv_reg11; |
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306 | 16'b0000000000001000 : slv_ip2bus_data <= slv_reg12; |
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307 | 16'b0000000000000100 : slv_ip2bus_data <= slv_reg13; |
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308 | 16'b0000000000000010 : slv_ip2bus_data <= slv_reg14; |
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309 | 16'b0000000000000001 : slv_ip2bus_data <= slv_reg15; |
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310 | default : slv_ip2bus_data <= 0; |
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311 | endcase |
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312 | |
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313 | end // SLAVE_REG_READ_PROC |
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314 | |
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315 | |
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316 | assign IP2Bus_Data = slv_ip2bus_data; |
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317 | |
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318 | //Reads occur immediately; acknowledge in same cycle as access |
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319 | assign IP2Bus_RdAck = slv_read_ack; |
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320 | //assign IP2Bus_WrAck = slv_write_ack; //Overridden below |
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321 | assign IP2Bus_Error = 0; |
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322 | |
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323 | /* Address map: |
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324 | HDL is coded [MSB:LSB] = [0:31] |
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325 | regX[0] maps to 0x80000000 in C driver |
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326 | regX[31] maps to 0x00000001 in C driver |
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327 | |
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328 | 0: Config: {clk_div_sel[2:0], 1'b0, RFA_AD_rst_n, RFB_AD_rst_n, 26'b0} |
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329 | [29:31] Clock divider bit sel (00=0.5*busclk, 01=0.25*busclk, ...) 0x00000003 |
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330 | [28 ] Reserved |
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331 | [ 27] RFA_AD reset (active low) 0x00000010 |
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332 | [ 26] RFB_AD reset (active low) 0x00000020 |
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333 | [0 :25] Reserved |
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334 | |
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335 | 1: SPI Tx |
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336 | [24:31] Tx data byte |
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337 | [16:23] 8-bit register address (0x00 to 0xFF all valid) |
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338 | [11:15] 5'b0 (always zero) |
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339 | [ 9:10] Num bytes to Tx/Rx; must be 2'b0 for 1-byte Tx/Rx |
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340 | [ 8] RW# 1=Read, 0=Write |
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341 | [ 7] RFA_AD chip select mask |
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342 | [ 6] RFB_AD chip select mask |
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343 | [ 0: 5] Reserved |
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344 | |
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345 | 2: SPI Rx: {RFA_AD_rxByte, RFB_AD_rxByte, 16'b0} |
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346 | [24:31] SPI Rx byte for RFA_AD 0x00FF |
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347 | [16:23] SPI Rx byte for RFB_AD 0xFF00 |
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348 | [ 0:15] Reserved 0xFFFF0000 |
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349 | |
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350 | 3-15: Reserved |
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351 | */ |
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352 | |
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353 | |
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354 | // `define AD9963_SPI_XFER_LEN 5'd16 //AD9777 testing |
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355 | `define AD9963_SPI_XFER_LEN 24 //AD9963 |
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356 | |
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357 | // `define AD9963_SPI_FIRST_RXBIT 5'd8 //AD9777 testing (8-bit instruction, 8-bit data) |
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358 | `define AD9963_SPI_FIRST_RXBIT 5'd16 //AD9963 (16-bit instruction, 8-bit data) |
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359 | |
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360 | |
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361 | wire [0:4] spi_bitNum; |
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362 | wire spi_mosi; |
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363 | wire spi_sclk; |
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364 | wire spi_cs; |
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365 | wire spi_rnw; |
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366 | wire RFA_AD_spi_cs, RFB_AD_spi_cs; |
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367 | wire spi_tx_reg_write; |
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368 | wire [0:2] clk_div_sel; |
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369 | wire spi_xfer_done; |
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370 | |
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371 | wire [0:31] RFA_AD_spi_rxData; |
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372 | wire [0:31] RFB_AD_spi_rxData; |
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373 | |
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374 | wire RFA_AD_spi_mosi, RFA_AD_spi_miso; |
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375 | wire RFB_AD_spi_mosi, RFB_AD_spi_miso; |
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376 | |
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377 | //Extract bits from IPIF slave registers and control signals |
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378 | |
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379 | //spi_io stores 32 bits for Tx/Rx |
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380 | // AD9963 only outputs 8-bit words during reads, always the last 8 bits of the transfer |
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381 | assign RFA_AD_spi_rx_byte = RFA_AD_spi_rxData[24:31]; |
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382 | assign RFB_AD_spi_rx_byte = RFB_AD_spi_rxData[24:31]; |
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383 | |
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384 | //SPI clock divider selection |
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385 | assign clk_div_sel = slv_reg0[29:31]; //0x7 from driver |
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386 | |
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387 | //SPI device resets (active low) |
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388 | assign RFA_AD_reset_n = slv_reg0[27]; //0x10 from driver |
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389 | assign RFB_AD_reset_n = slv_reg0[26]; //0x20 from driver |
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390 | |
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391 | //SPI device chip selects (active high; inverted before use below) |
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392 | assign RFA_AD_spi_cs = slv_reg1[7]; //0x01000000 from driver |
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393 | assign RFB_AD_spi_cs = slv_reg1[6]; //0x02000000 from driver |
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394 | |
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395 | //Internal signal for read vs. write transaction |
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396 | assign spi_rnw = slv_reg1[32-`AD9963_SPI_XFER_LEN]; //0x00800000 from driver |
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397 | |
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398 | //Use the IPIC write-enable for the SPI Tx register as the SPI go |
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399 | // The bus will be paused until this core ACKs the write |
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400 | assign spi_tx_reg_write = Bus2IP_WrCE[1]; |
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401 | |
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402 | //spi_tx_reg_write (Bus2IP_WrCE[1]) de-asserts as soon as transaction is ACK'd |
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403 | // so this mux switches back to the generic ACK as soon as the SPI xfer is done |
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404 | //Thus, the duration of assertion for spi_xfer_done doesn't really matter |
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405 | //A bit fast-n-loose, but works ok |
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406 | assign IP2Bus_WrAck = spi_tx_reg_write ? spi_xfer_done : slv_write_ack; |
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407 | |
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408 | //SPI device chip selects are active low |
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409 | assign RFA_AD_spi_cs_n = ~(RFA_AD_spi_cs & spi_cs); |
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410 | assign RFB_AD_spi_cs_n = ~(RFB_AD_spi_cs & spi_cs); |
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411 | |
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412 | //Mask each device's SPI clock output by its CS; no point toggling signals that will be ignored |
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413 | assign RFA_AD_spi_sclk = (spi_sclk & RFA_AD_spi_cs); |
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414 | assign RFB_AD_spi_sclk = (spi_sclk & RFB_AD_spi_cs); |
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415 | |
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416 | //All SPI devices driven by same serial data output; CS signals control who listens |
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417 | assign RFA_AD_spi_mosi = RFA_AD_spi_cs ? spi_mosi : 1'b0; |
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418 | assign RFB_AD_spi_mosi = RFB_AD_spi_cs ? spi_mosi : 1'b0; |
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419 | |
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420 | //AD9963 SPI data is bi-directional; IOBUFs instantiated here to switch I vs. O mid-transfer |
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421 | //Set spi_sdio pins as inputs except when actively driving, to avoid accidental drive fights |
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422 | // FPGA drives the sdio pin when: |
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423 | // An SPI transaction is in progress AND |
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424 | // The transaction is a read AND the current bit is part of the instruction bytes |
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425 | // OR |
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426 | // The transaction is a write |
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427 | assign RFA_AD_spi_sdio_output_en = spi_cs & ( (spi_rnw & (spi_bitNum < `AD9963_SPI_FIRST_RXBIT)) | (~spi_rnw)); |
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428 | assign RFB_AD_spi_sdio_output_en = spi_cs & ( (spi_rnw & (spi_bitNum < `AD9963_SPI_FIRST_RXBIT)) | (~spi_rnw)); |
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429 | |
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430 | IOBUF IOBUF_RFA_AD_sdio ( |
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431 | .IO(RFA_AD_spi_sdio), //Connected to actual FPGA pin |
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432 | .I(RFA_AD_spi_mosi), //Logic-> Pad, input to OBUFT |
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433 | .O(RFA_AD_spi_miso), //Pad-> Logic, output of IBUF |
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434 | .T(~RFA_AD_spi_sdio_output_en) |
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435 | ); |
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436 | |
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437 | IOBUF IOBUF_RFB_AD_sdio ( |
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438 | .IO(RFB_AD_spi_sdio), //Connected to actual FPGA pin |
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439 | .I(RFB_AD_spi_mosi), //Logic-> Pad, input to OBUFT |
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440 | .O(RFB_AD_spi_miso), //Pad-> Logic, output of IBUF |
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441 | .T(~RFB_AD_spi_sdio_output_en) |
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442 | ); |
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443 | |
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444 | warp_spi_io #(.SPI_XFER_LEN(`AD9963_SPI_XFER_LEN)) spi_io |
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445 | ( |
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446 | .sys_clk(Bus2IP_Clk), |
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447 | .reset(Bus2IP_Reset), |
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448 | .go(spi_tx_reg_write), |
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449 | .done(spi_xfer_done), |
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450 | .clkDiv(clk_div_sel), |
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451 | |
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452 | .currBitNum(spi_bitNum), |
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453 | |
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454 | .txData(slv_reg1), |
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455 | |
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456 | .rxData1(RFA_AD_spi_rxData), |
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457 | .rxData2(RFB_AD_spi_rxData), |
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458 | .rxData3(), |
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459 | .rxData4(), |
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460 | |
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461 | .spi_cs(spi_cs), |
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462 | .spi_sclk(spi_sclk), |
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463 | |
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464 | .spi_mosi(spi_mosi), |
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465 | |
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466 | .spi_miso1(RFA_AD_spi_miso), |
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467 | .spi_miso2(RFB_AD_spi_miso), |
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468 | .spi_miso3(1'b0), |
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469 | .spi_miso4(1'b0) |
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470 | ); |
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471 | |
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472 | endmodule |
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