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
Product Part: simulate
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 latest Xilinx model fi
les 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 techsuppor
t@orcad.com if you are interested in getting the updated model files so they can give you the passwo
rd.
There are two model files for each Xilinx family. One file contains the primitives for a particular
Xilinx family and the other file, which has an _M in the name, contains the macros for a particular
Xilinx family. Place any set of these files in your project as VHDL model files and then load you
r project as you normally 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 the global signals be
fore you run a simulation.
Solution 1:
End of Record #1909 - Last Modified: 02/26/97 11:06 |
