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AR# 9221

F2.1i Virtex simulation - INTERNAL_BLOCKRAM.GSR - too short PULSE

Description

Keywords: Blockram, Virtex, foundation, pulse width

Urgency: standard

Description: When performing timing simulation on a Virtex design witch contains Block Ram, Logic simulator may give a warning similar to the following:

Signal: My_Mem/BU0/INTERNAL_BLOCKRAM.GSR - too short PULSE, missing time 11.4ns

The warning occurs no matter how long the GSR pin is held high.

解决方案

The 'too short PULSE' warning is incorrect - it is an error in the Foundation simulation model.

A user should be able to safely ignore this warning as long as they verify that the GSR pin has been held high longer than the minimum GSR pulse width specification in the Data Book (typically less than 15 nS).

To avoid this warning a user may edit the time_sim.edn file.
1) Search for all instances of the PWGSRHI property statement.
Example:
(property PWGSRHI (integer 13000)(unit TIME) (owner "Xilinx"))
2)Either delete the entire line or change the integer value
to a small number like 100.

This error will be fixed for the Foundation 3.1 release
AR# 9221
创建日期 05/04/2000
Last Updated 03/12/2002
状态 Archive
Type 综合文章