Answers Database
Abel macro feedthroughs are being ignored in F1.5
Record #4943
Product Family: Software
Product Line: CPLD Implementation
Product Part: hitop
Product Version: 1.5p
Problem Title:
Abel macro feedthroughs are being ignored in F1.5
Problem Description:
Urgency: Standard
General Description:
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 feedthrough'
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 1:
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
End of Record #4943 - Last Modified: 04/28/99 14:51 |
