Xilinx Answer #1167 : XABEL: AHDL2X will hang at "processing equations..." with wide buses.

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XABEL: AHDL2X will hang at "processing equations..." with wide buses.

Record #1167
Product Family: Software

Product Line: Data I/O

Product Part: xabel

Problem Title:
XABEL: AHDL2X will hang at "processing equations..." with wide buses.

Problem Description:

In processing an xabel design, you might see a probelm like this: {jamesm@nuke-8}ahdl2x ndiff AHDL2X ABEL-HDL Processor Xilinx-ABEL 5.12 Copyright 1992-1994 Data I/O Corp. All Rights Reserved.

Module: 'ndiff'

Processing equations.....

and it never makes further progress. This can be due to a
limitation of XABEL in handling larger width counters, adders,
comparators, etc.

Solution 1:

The @CARRY directive allows the reduction of the amount of
logic required for processing large arithmetic functions, by specifying the maximum bit width.

Xabel can handle up to 8 bits without problems. To force xabel
to break a design up into 8 bit sections use this directive:

@CARRY 8;

under the EQUATIONS keyword.

This will force XABEL to generate 8-bit functions only.

End of Record #1167 - Last Modified: 01/22/97 14:14

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