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AR# 15088

5.1i Primetime, XILINX2PRIMETIME - A translation of the MAXDELAY/OFFSET constraint is incorrect

Description

Keywords: Primetime, MAXDELAY, offset

Urgency: Standard

General Description:
When I run the XILINX2PRIMETIME command, the translation of the MAXDELAY and OFFSET constraints is performed incorrectly.

Solution

To work around this issue, you must modify the SDC file manually, removing the negative or incorrect values.

An example of the bad SDC is as follows:
set_max_delay -from [all_inputs] -to [all_outputs] -20
set_input_delay -20 -clock "clk" [remove_from_collection [all_inputs] [get_ports {clk}]]
set_output_delay -20 -clock "clk" [all_outputs]

These should appear as:
set_max_delay -from [all_inputs] -to [all_outputs] 20
set_input_delay 0 -clock "clk" [remove_from_collection [all_inputs] [get_ports {clk}]]
set_output_delay 0 -clock "clk" [all_outputs]

This problem is fixed in the latest 5.1i Service Pack, available at:
http://support.xilinx.com/support/techsup/sw_updates
The first service pack containing the fix is 5.1i Service Pack 1.
AR# 15088
Date Created 07/09/2002
Last Updated 03/06/2005
Status Archive
Type General Article