hithesh123
Full Member level 6
I was looking thru the synthesis report of a simple design.
The output buffer delay was listed as 3.2ns. That seems to be too high for a buffer.
Any explanation?
report below -
Timing Detail:
--------------
All values displayed in nanoseconds (ns)
=========================================================================
Timing constraint: Default path analysis
Total number of paths / destination ports: 6 / 1
-------------------------------------------------------------------------
Delay: 7.368ns (Levels of Logic = 4)
Source: B<1> (PAD)
Destination: Y2 (PAD)
Data Path: B<1> to Y2
Gate Net
Cell:in->out fanout Delay Delay Logical Name (Net Name)
---------------------------------------- ------------
IBUF:I->O 1 1.218 0.595 B_1_IBUF (B_1_IBUF)
LUT4:I0->O 1 0.704 0.455 Y21_SW0 (N3)
LUT3:I2->O 1 0.704 0.420 Y21 (Y2_OBUF)
OBUF:I->O 3.272 Y2_OBUF (Y2)
----------------------------------------
Total 7.368ns (5.898ns logic, 1.470ns route)
(80.0% logic, 20.0% route)
The output buffer delay was listed as 3.2ns. That seems to be too high for a buffer.
Any explanation?
report below -
Timing Detail:
--------------
All values displayed in nanoseconds (ns)
=========================================================================
Timing constraint: Default path analysis
Total number of paths / destination ports: 6 / 1
-------------------------------------------------------------------------
Delay: 7.368ns (Levels of Logic = 4)
Source: B<1> (PAD)
Destination: Y2 (PAD)
Data Path: B<1> to Y2
Gate Net
Cell:in->out fanout Delay Delay Logical Name (Net Name)
---------------------------------------- ------------
IBUF:I->O 1 1.218 0.595 B_1_IBUF (B_1_IBUF)
LUT4:I0->O 1 0.704 0.455 Y21_SW0 (N3)
LUT3:I2->O 1 0.704 0.420 Y21 (Y2_OBUF)
OBUF:I->O 3.272 Y2_OBUF (Y2)
----------------------------------------
Total 7.368ns (5.898ns logic, 1.470ns route)
(80.0% logic, 20.0% route)