Changes between Version 3 and Version 4 of howto/XPS_to_PlanAhead

Timestamp:

Mar 4, 2014, 8:55:59 PM (10 years ago)

Author:

murphpo

Comment:

--

howto/XPS_to_PlanAhead

@@ -21 +21 @@
 You should now see the PlanAhead workspace. 
 
-== Creating the PlanAhead XPS Source ==
+=== Creating the PlanAhead XPS Source ===
  1. Start in the PlanAhead workspace and find the '''Sources''' tab, probably in the upper-left of the Project Manager sub-pane.
  1. Right-click and select '''Add Sources'''
@@ -47 +47 @@
 If XPS throws an error,  you probably forgot to copy cores/code from the old XPS project. Also double check that your edk_user_repository is up to date and that the edk_user_repository is in the Global Peripheral Repository Search Path in the XPS preferences (see [wiki:edk_user_repository edk_user_repository] for more).
 
+=== HDL Wrapper ===
+
 At this point your PlanAhead project has one source, the XPS project. Unfortunately PlanAhead does not support XPS projects as top-level modules for implementation.
 
@@ -53 +55 @@
 [[Image(pa_src_top_hdl.png)]]
  1. Notice that the XPS project instance has been renamed {{{xps_top_i}}} - this is important for the next step
+
+=== Constraints ===
 
 You must now add a constraints file to the PlanAhead Project. Your constraints will be based on the top-level constraints from your source XPS project.
@@ -68 +72 @@
 The PlanAhead-wrapped XPS project uses the same net names when connecting XPS ports to top-level pins. For constraints which refer to top-level nets, like {{{NET clk_in LOC = SOME_PIN}}}, no changes are required.
 
-For constraints which refer to nets or instances by hierarchical name, the new UCF must be udpated to reflect the XPS project instance name.
+For constraints which refer to nets or instances by hierarchical name, the new UCF must be updated to reflect the XPS project instance name and hierarchy.
+
+For example, assume your original XPS project {{{system.ucf}}} had the following constraints:
+{{{#!sh
+#XPS system.ucf
+
+#Top-level ports
+NET "led_red"    LOC = A1;
+NET "led_green"  LOC = A2;
+NET "led_yellow" LOC = A3;
+
+#TEMAC loc
+INST "ETH_MAC*v6_emac" LOC = "TEMAC_X0Y0";
+}}}
+
+The updated constraints for the PlanAhead {{{xps_constraints.ucf}}} file would be:
+
+{{{#!sh
+#PlanAhead xps_constraints.ucf
+
+#Top-level ports
+NET "led_red"    LOC = A1;
+NET "led_green"  LOC = A2;
+NET "led_yellow" LOC = A3;
+
+#TEMAC loc
+INST "xps_top_i/ETH_MAC*v6_emac" LOC = "TEMAC_X0Y0";
+}}}
+
+Notice the '''{{{xps_top_i}}}''' prefix on the TEMAC LOC constraint. Because this constraint refers to a design object by hierarchical name the path must include the new XPS project instance name.
+