= [wiki:OFDMReferenceDesign OFDM Reference Design] History =
== OFDM Reference Design v10 (2008-Jul-17) ==
 * '''Known issue:''' see [http://warp.rice.edu/forums/viewtopic.php?pid=1356#p1356 this forum post] for details; this will be fixed in ref design v11
 * Download the XPS project: [http://warp.rice.edu/bigFiles/OFDM_ReferenceDesign_v10.zip OFDM_ReferenceDesign_v10.zip]
 * Built using cores and code as of repository [source:/@1010 revision 1010]
 * This design requires version 10.1.02 of the Xilinx tools
 * Data-ACK turnaround time is now 23µs (as measured by the fall of data Tx to rise of ACK Tx)

'''Hardware Changes'''

 * Xilinx deprecated the OPB and PLB34 busses. PLB46 is the new (and only) bus standard used in this design
 * The System Generator cores (OFDM transceiver, timer, packet detector & AGC) were created using Sysgen's new PLB46 export flow; sysgen2opb is no longer required
 * Xilinx did not port the plb_ethernet EMAC forward to PLB46. This design uses the xps_ethernetlite EMAC instead, customized to enable promiscuous mode (i.e. no receive address filtering)
 * The xps_centraldma pcore is used to handle DMA (since the EMAC no longer provides its own DMA)
 * The OFDM transceiver has a new interrupt output indicating the reception of a bad header
 * Fixed a few logic bugs in the transceiver's handling of multiple interrupts
 * Merged all user I/O into single GPIO core (LEDs, hex displays, push buttons & DIP switch); a [source:/PlatformSupport/WARPMAC/util/warp_userio.h header file] helps with the required bit masking/shifting. The [source:/PlatformSupport/XBD/boards XBD files] have been updated to use the same user I/O scheme.

'''Software Changes'''

 * Ethernet is now operated exclusively in a polling mode for increased performance
 * [source:/PlatformSupport/WARPMAC WARPMAC/WARPPHY] re-architected and cleaned; the code flows for transmitting and receiving packets are now consistent across various packet types
 * A layer of [source:/PlatformSupport/WARPMAC/util register access macros] was added between WARPPHY and the OFDM cores; these macros adapt the old sysgen2opb register access code to the new Sysgen PLB46 export code. These macros will retired in a future revision.

----
== OFDM Reference Design v09 (2008-Jun-11) ==
 * Download the XPS project: [http://warp.rice.edu/bigFiles/OFDM_ReferenceDesign_v09.zip OFDM_ReferenceDesign_v09.zip]
 * Built using cores and code as of repository [source:/@906 revision 906]
 * This version assumes a different location for TxDCO calibration information in the EEPROM of the radios. Please re-calibrate before running (instructions are [wiki:HardwareUsersGuides/RadioBoard_v1.4/Usage/TxDCOffset here])
 * This will be the last reference design that will use the version 9 Xilinx tools. Reference Design v10 will use the version 10 Xilinx tools.
 * Updated [source:/PlatformSupport/WARPMAC/ warpmac/warpphy] & [source:/ResearchApps/MAC/CSMAMAC/ csmamac]
   * Header interrupts are used to pipeline receive processions (i.e. an ACK is constructed and loaded into a PHY before the packet is even completely received)
   * Fall of Tx data to rise of Tx ACK turn-around time reduced from 80 microseconds to 30 microseconds
   * By default, left and right push buttons use left and right radios respectively (only for MIMO WARP kits)
   * Numerous tweaks to MAC timing parameters

----
== OFDM Reference Design v08 (2008-Feb-08) ==
 * Download the XPS project: [http://warp.rice.edu/bigFiles/OFDM_ReferenceDesign_v08.zip OFDM_ReferenceDesign_v08.zip]
 * Built using cores and code as of repository [source:/@834 revision 834]
 * Updated [source:/ResearchApps/PHY/MIMO_OFDM OFDM PHY]
   * Added support for header-only packets (like ACKs); numFullRateSymbols can be zero
   * Last two bytes of header are now a 16-bit CRC of just the header
   * Added new interrupt output for good header; asserts for non-header-only packets when header CRC passes
   * Added TxDone interrupt output; asserts when a packet transmission finishes
   * Fixed bugs in dynamic modulation mask usage
 * Updated [source:/PlatformSupport/WARPMAC/ warpmac/warpphy] & [source:/ResearchApps/MAC/CSMAMAC/ csmamac]
   * Changes to support new PHY features
   * Added TxDone & GoodHeader interrupt handlers; unused in this version
   * Added lots of comments to the source code to better explain various MAC/PHY interactions