Using Foundation schematic with an ABEL Macro. If an output is connected directly to an input then the fitter trims the signal.
example:
module fd_thru Title 'Macro with 1 input and 2 outputs. 1 output inverted, the other is a direct feed through'
Declarations
IN PIN; OUT1 PIN; OUT2 PIN;
Equations
OUT1 = IN; OUT2 =!IN;
end fd_thru
On the schematic the pins are simply connected to buffers and pads. The fitter trims OUT1 but OUT2 is fit correctly. This problem exists for 9500 and 9500xl only. FPGA implementation works correctly.
Solution
The current solution is to add logic to the ABEL file. Possibly put an inverter inside and on the output of a macro with direct feedthroughs.
This has been fixed in software version 2.1
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AR# 4943
Date
06/10/2002
Status
Archive
Type
General Article
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