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Timing analyser

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knight

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Aug 27, 2008, 11:56:43 PM8/27/08
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Hi

Im using timing analyser.
This is a part of my timing report

Data Path: reset to U1/count_9
Delay type Delay(ns) Logical Resource(s)
---------------------------- -------------------
Tiopi 1.300 reset
reset_IBUF
net (fanout=16) 0.444 reset_IBUF
Tilo 0.759 U1/count_or00001
* net (fanout=11) 0.674 U1/count_or0000
Tsrck 0.910 U1/count_9
---------------------------- ---------------------------
Total 4.087ns (2.969ns logic, 1.118ns route)
(72.6% logic, 27.4% route)


Actuallty U1/count_or00001 is a [FG] which sources more than 20
FlipFlops reset ( which i can see in floorplanner).
And the driving net is U1/count_or0000.( this should source more than
20 FFs)
Then why is the fanout given as 11 ..? (Please refer to * in the
report)
Shouldnt it be greater than 20..?

Symon

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Aug 28, 2008, 5:18:49 AM8/28/08
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"knight" <krsh...@gmail.com> wrote in message
news:01250168-8d89-41c3...@m36g2000hse.googlegroups.com...
> Hi

>
>
>
> Actuallty U1/count_or00001 is a [FG] which sources more than 20
> FlipFlops reset ( which i can see in floorplanner).
> And the driving net is U1/count_or0000.( this should source more than
> 20 FFs)
> Then why is the fanout given as 11 ..? (Please refer to * in the
> report)
> Shouldnt it be greater than 20..?

Sir Knight,
Have a look at the net in FPGA editor. I guess that two FFs in a slice get
fed from a single pin.
HTH., Syms.


knight

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Aug 28, 2008, 6:11:12 AM8/28/08
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On Aug 28, 2:18 pm, "Symon" <symon_bre...@hotmail.com> wrote:
> "knight" <krshe...@gmail.com> wrote in message

thank you...

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