AR# 4041: V1.5.x CORE Generator, NGDBuild, (Virtex block RAM) - "ERROR: BASNB Pin mismatch". I cannot select the netlist bus delimiter format if one of my selections is VHDL or Verilog Instantiation Template.
AR# 4041
V1.5.x CORE Generator, NGDBuild, (Virtex block RAM) - "ERROR: BASNB Pin mismatch". I cannot select the netlist bus delimiter format if one of my selections is VHDL or Verilog Instantiation Template.
Description
Keywords: CORE Generator, COREGen, bus netlist format, delimiter, VHDL, Verilog
Urgency: Standard
General Description: If one of your selections under Options->Core Generator Options is VHDL or Verilog Instantiation Template, CORE Generator v1.5.x does not allow you to select anything other than B as the bus netlist format for the CORE Generator EDIF Implementation Netlist.
Solution
This is a known problem.
The M1.5 version of CORE Generator assumes that the bus delimiter must be "<>" in the .EDN file it generates if either Verilog or VHDL instantiation templates are selected as desired outputs.
The work-around requires two steps:
1. First select only the "EDIF Implementation Netlist" option as the desired output and set the bus delimiter to the required format, then generate the module once.
VIRTEX BLOCK RAM: If you are generating a Virtex Block RAM, you will also need to manually back the EDIF file that is generated in this step to a different file name.
2. For the second iteration, *deselect* "EDIF Implementation Netlist" FIRST to avoid overwriting the EDIF generated the first time around, select "Verilog (or VHDL) Behavioral Simulation Model" and/or "Instantiation Template" for the output format, then generate the module again.
VIRTEX BLOCK RAM: If you are trying to generate the Virtex Block RAM, you cannot generate HDL outputs without also selecting the EDIF Implementation Netlist, so select both, generate the module, then copy back the renamed EDIF file generated in step 1 to your original module name.
This problem is fixed in the COREGen v1.5.2, which is bundled together with the A1.5isp1 and F1.5isp1 Service Packs. These two service packs are available as of Feb. 11 and may be downloaded from this location: