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Forums > Digital IC > Floorplanning, Place and route

Subject: How to constraint the Input/output Port in SignalStorm?
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aidans
Posts: 35
Online: User is Offline
2/03/2008 4:45 AM  
I use the SignalStorm to calculate delay, the scripts use db_delay db_screen like command.

 I know there are two ommand  related to the IO enviroment, set_driving_cell and set_load
and  there are sytax in the docs, but I could not set it right in my scripts.


set_load
set_load
{-pin | -net | -inst}
name
value


set_driving_cell
set_driving_cell
-pin [cell]:pin
-cell cell_name
-from input_pin
-to output_pin

How should  I define all the Inputs ports or the outputs ports ?

[all_inputs] and [all_outputs] do NOT work.

Anyone interested this problem ?

BobD
Posts: 80
Online: User is Offline
2/07/2008 5:57 AM  
Hi aidans,

From the syntax you show here, it looks like you're using standalone SignalStorm (as opposed to running within SoC-Encounter or Encounter Timing System). Within SoC-Encounter, it seems like [all_outputs]/[all_inputs] would work as you expect:

encounter 9> help set_driving_cell
Usage: set_driving_cell [-library ] [-lib_cell
] [-pin ]
[-from_pin ]
[-rise | -fall] [-min | -max]
[-input_transition_rise ]
[-input_transition_fall ]


It sounds like the behavior is different in standalone SignalStorm. If you're unable/don't want to run SignalStorm from within SoC-Encounter or ETS, maybe you could target the ports with a "*"? Have you tried that? The commands might be smart enough to know that set_load should only be applied to all outputs and set_driving_cell to all inputs.

Please post back and let us know whether this is still an issue for you.

Thanks,
Bob
aidans
Posts: 35
Online: User is Offline
2/12/2008 10:58 PM  
Thanks Bob

Yes, It is standalone version of Signalstorm

with your sugesstion, I use * as the target port, porblem is solved.
The driver cell and load have effect as expected.

The tools are really very smart.

Thank YOU !
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Forums > Digital IC > Floorplanning, Place and route > How to constraint the Input/output Port in SignalStorm?


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