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AR# 15502

5.1i ECS - ERROR: "HDLParsers:164 - parse error, unexpected COLON, expecting COMMA or CLOSEPAR..."

Description

Keywords: ECS, parser, comma, closepar, unexpected colon, SCH2VHDL, schematic, CORE Generator, COREGen, one bit bus, (0:0), VHDL, XST, LeonardoSpectrum

Urgency: Standard

General Description:
If an ECS schematic contains a one-bit input or output written in bus notation (i.e., MYbitBUS(0:0)) and the synthesis flow runs through XST VHDL, the design generates synthesis errors similar to the following:

"Compiling vhdl file E:/data/examples/bidi/hash.vhf in Library work.
ERROR:HDLParsers:164 - E:/examples/hash.vhf Line 54. parse error, unexpected COLON, expecting COMMA or CLOSEPAR
ERROR:HDLParsers:900 - E:/examples/hash.vhf Line 56. The label xlxi_2 is not declared."

If LeonardoSpectrum VHDL is used for the same design, the following error message is reported:

"e:/examples/hash.vhf", line 54: Syntax Error near ':'."

(NOTE: A CORE Generator component with a 1-bit data-bus output will have a pin with a defined width of (0:0). If you connect this pin directly to another component that has a simple pin connection (no defined width), the same error will occur when you synthesize.)

Solution

These errors occur because the SCH2VHDL netlist writer is not handling the one-bit bus correctly.

There are two possible methods of working around the issue:

1. Change the name of the net from "NETNAME(0:0)" to "NETNAME".

2. Use the XST Verilog or LeonardoSpectrum Verilog flow when the design does not contain VHDL macros.

This problem is fixed in the latest 5.1i Service Pack, available at:
http://support.xilinx.com/support/techsup/sw_updates
The first service pack containing the fix is 5.1i Service Pack 1.
AR# 15502
Date Created 08/28/2002
Last Updated 01/08/2006
Status Archive
Type General Article