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Forums > Digital IC > Floorplanning, Place and route

Subject: How to add buffers to all inputs and spare cells
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sundaresan
Posts: 5
Online: User is Offline
4/09/2007 10:52 PM  

1) i need to add buffers and antenna diodes to to all the inputs after completeing the routing,
how to do it?

2) Also i have to add some 20 buffers 20 inverters and 10 nand gates(with thier inputs connected to VSS)  to my design after Routing, how to add these spare cells?

i tried to add spare cells with the Add spare cells option available in encounter but i am not able to insert exactly 20buffers?
 

Kindly help me to do it
mohanch007
Posts: 52
Online: User is Offline
4/10/2007 2:25 AM  
1) is your design a block or chip ??
i) does your design shows any process antenna violations ??

2) does your ECO net-list has any such changes ??
Do you know the net name & buffer , inverters, nand type ??

Once final Q. are you undergoing any training classes or the above talk was your challenge ??
Please let me know !!

Regards,
Mohan
sundaresan
Posts: 5
Online: User is Offline
4/10/2007 4:16 AM  
I am not undergoing any training, but i am new to encounter tool And working on a Block level design using it without any external support.

And these are issues which i dont get proper help from the Cadence documents. thats why i post my questions here

1. Though i dont have any antenna violation, But still i have to insert diodes and buffers at the input pins for the block.

2. i need to insert these spare cells for latter usage. these cells are not part of of the Design netlist. It is just for future usage.
EngHan
Posts: 65
Online: User is Offline
4/13/2007 2:13 AM  
Hi Sundaresan,

From my understanding of your need, the antenna diode, buffer should be added before placement, and after floorplan. See "attachIOBuffer" command.

For spare cell, I usually add it into the netlist. Then use the command "specifySpareGate" to evenly place it in the core. Run the command before placement.


Regards,
Eng Han
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Forums > Digital IC > Floorplanning, Place and route > How to add buffers to all inputs and spare cells


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