Answers Database

OrCAD Simulate: How to use Xilinx's global reset and tri-state signals for functional simulation?


Record #1909

Product Family:  Software

Product Line:  OrCad

Problem Title:
OrCAD Simulate: How to use Xilinx's global reset and tri-state signals
for functional simulation?



Problem Description:
Xilinx has global signals that are for setting and resetting
flip-flips and initializing tri-state buffers.	These signals are as follows:

GR - Global Reset for Xilinx 2k, 3k, and 5k families.
GSR - Global Set/Reset for Xilinx 4k and 4ke families.
GTS - Global Tri-state for Xilinx 4k, 4ke, and 5k families.

These global signals will not be in the VHDL netlist created by
Capture.  Therefore, in order to simulate them functionally you will need the la
test Xilinx model files that are on the OrCAD web site at:

http://www.orcad.com/simupdat.htm

The name of the file is XLIB.ZIP and it is password protected.	Please e-mail to
 OrCAD at techsupport@orcad.com if you are interested in getting the updated mod
el files so they can give you the password.

There are two model files for each Xilinx family.  One file contains the primiti
ves for a particular Xilinx family and the other file, which has an _M in the na
me, contains the macros for a particular  Xilinx family.  Place any set of these
 files in your project as VHDL model files and then load your project as you nor
mally do.  When you  create stimulus for the design you will notice a new contex
t underneath your design context.  This new context is where you can stimulate t
he global signals before you run a simulation.



Solution 1:





End of Record #1909