command to find the maximum and minimum drivestrength of a particular std cell

Selva: I am surprized optDesign did not automatically fix max tran for you.

The following online document will help you a lot.

Getting started with DB Tcl scripting in EDI System
Useful single line dbGet scripts

Solution ID:    11598038

30. To query the max_cap for a list of cells

     set cellPtrList [dbGet -p head.allCells.name BUF*]
     foreach cellPtr $cellPtrList {puts "[dbGet $cellPtr.name] [dbFTermMaxCap [dbGet -p $cellPtr.terms.name <term>] 1]"}

Shawn

Thanks a lot Shawn.

I tried that command and it's very useful.

Thanks

selva. 

Selva:
All of the commands in  "Useful single line dbGet scripts"  are useful, this should be required reading and on the pop quiz.
Solution ID:    11598038

Back to your max tran violations. I still don't understand why optDesign didn't fix these automatically.

Max output cap violations are relatively easy to fix, upsize the driver until you are at the cell types maximum drive strength after that you must resort to ecoAddRepeater.

 ecoAddRepeater
    {-net netName | -term inst1/term inst2/ ...}
    -cell masterCellName
    [-loc {x y | x1 y1 x2 y2} [-radius μm]] |
    [-relativeDistToSink value [-radius μm]] |
    [-offLoadSlack ns [-radius μm]] |
    [-noPlace] |
    -offLoadAtLoc {x y}
    [-evaluateOnly | -evaluateAll]
    [-hinstGuide]

Max input trans are not as simple to fix, the root cause is generally the RC loss due to long interconnect.
Simply Increasing the source drive strength may not improve the situation.

Blindly using ecoAddRepeater is dangerous if you do not understand the interconnect topology.
For each input transition violation you must be aware of the, source inst/ type, net name/length/fanout.
These give you some textual hint to the solution, but I always visually verify.

If there is no source max cap , the nets fanin = 1,  then ecoAddRepeater -net is the fix.
If there is no source max cap , the nets fanin > 1,  then ecoAddRepeater -term is the  fix.
Basically you have to differentiate between , sinks near and sinks far.
Adding a buffer on nearby sinks is a waste, you want the sinks far to be in the ecoAddRepeater -term list.

Shawn ... Tapeout Today : )

Hey, can you help me with TCL script to fix DRV violations?