(CELL (CELLTYPE "X_FF")
(INSTANCE count_3)
(DELAY
(ABSOLUTE
(PORT CLK (106:115:115)(106:115:115))
(PORT I (22:24:24)(22:24:24))
(PORT RST (680:693:733)(680:693:733))
(IOPATH CLK O (239:260:260)(239:260:260))
(IOPATH RST O (527:573:573)(527:573:573))
(CELL (CELLTYPE "X_FF")
(INSTANCE count_3)
(DELAY
(ABSOLUTE
(PORT CLK ( 115 )( 115 ))
(PORT I ( 24 )( 24 ))
(PORT RST ( 733 )( 733 ))
(IOPATH CLK O ( 260 )( 260 ))
(IOPATH RST O ( 573 )( 57 )
This is an expected behavior and is seen for all devices.
When the .ucf file is not provided/empty, the .pcf file is empty.
In this case the SDF file generated does not need to be timing aware and you can only perform a default analysis while running timing simulation using the MAX values (worst case) which are only present in the file.
These are the worst delays which would be used by the tool while running simulation.
AR# 50331 | |
---|---|
Date | 01/21/2015 |
Status | Active |
Type | General Article |
Devices | |
Tools |