AR# 1167: XABEL: AHDL2X will hang at "processing equations..." with wide buses.
AR# 1167
XABEL: AHDL2X will hang at "processing equations..." with wide buses.
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.
解决方案
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.