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Subject: How to fix all registers in encounter
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myazdani
Posts: 0
Online: User is Offline
12/20/2006 8:01 AM  
Hi,

Does anyone know of any automatic way to fix all registers in encounter after CTS?

It seems like a pretty common task, and I thought I would ping the community before I start digging for a way myself.

Thanks,

Manzur. 
lisiang
Moderator
Posts: 48
Online: User is Offline
12/20/2006 10:07 AM  
proc fixCellPlc {} {
foreach instName [dbFindInstsByCell SDFF*] {
dbSetIsInstPreplaced $instName 1
}
}


you have to change "SDFF*" to your reg master name type.

li siang
mohanch007
Posts: 52
Online: User is Offline
12/20/2006 5:37 PM  

Hi Manzur,

I think it is highly advisable to preserve all the clock network (tree) once you have satisfied CTS results .

Aside the good tcl from li siang for only FF`s ( Does your CTS covers all FF's in your desing ??), i recommend to use .
#-- Change clock status (PLACED -> FIXED)
changeClockStatus -clk FE_CTS_ROOT/Z -fixedBuffers -fixedNetWires -useClock

NOTE : useClock switch has special treatment in routing ( if you specify special attributes like extra space ,top metal layers etc..)
like Ex .
#-- Clock routing
setAttribute -net {@CLOCK} -weight 20 -preferred_extra_space 1

FYI.
-fixedBuffers
 Changes the placement status of buffers, inverters, flip-flops, and gating cells from PLACED to FIXED.
 
-fixedLeafInst
 Changes the placement status of leaf instances from PLACED to FIXED.
 
-fixedNetWires
 Changes status of wires in clock nets from ROUTED to FIXED.
 
-fixedNonLeafInst
 Changes the placement status of non-leaf instances from PLACED to FIXED

With Regards,
CH.MOHAN KUMAR
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Forums > Digital IC > Floorplanning, Place and route > How to fix all registers in encounter


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