65 nm Signals Specification

[master_picengineer]

specification of slews

Hi members,
Please who can tell me what is the rise/fall Time to gate a 65 nm CMOS transistor.
How to determine it.
Thanks in advance for your replies.

 

[iwpia50s]

liberty timing file files

This is a subjective question...what is the environment?

 

[master_picengineer]

What do you mean by environment ?

 

[onlymusic16]

He means to say what are the PVT conditions?

 

[gliss]

Also depends on the load attached to the transistor.

 

[shu001]

I think you mean the delay level for 65n standard cells in normal application, is it? It also depends on PVT as well as gate's loading.

 

[master_picengineer]

Yes Sir.

 

[iwpia50s]

Are you doing library characterization or simply using an existing library with pre-characterized cells? If library characterization then it is more difficult to explain but if you are using an existing library then the cell characterization are in the timing library. Typically for 65nm, data path signals slews on worst PVT are about 200 to 300 ps.

 

[ericyuan]

clock 50-100ps
data 100-200ps

 

[master_picengineer]

Are you doing library characterization or simply using an existing library with pre-characterized cells? If library characterization then it is more difficult to explain but if you are using an existing library then the cell characterization are in the timing library. Typically for 65nm, data path signals slews on worst PVT are about 200 to 300 ps.

Hi all,
I designed some gates for a library and I'm doing the characterization.
I'm sorry cause I'm not familiar with this technique, can you iwpia50s through more light on the PVT ?
Thanks again.

 

[iwpia50s]

For setup timing analysis you want the worst PVT (process, voltage, temperature) condition. The Synopsys liberty timing file is characterized for specific PVT points. The index tables should have the slew vs capacitance load for timing analysis.

 

[onlymusic16]

Are you doing library characterization or simply using an existing library with pre-characterized cells? If library characterization then it is more difficult to explain but if you are using an existing library then the cell characterization are in the timing library. Typically for 65nm, data path signals slews on worst PVT are about 200 to 300 ps.

Hi all,
I designed some gates for a library and I'm doing the characterization.
I'm sorry cause I'm not familiar with this technique, can you iwpia50s through more light on the PVT ?
Thanks again.

Characterization of a cell means you will actually provide a stimulus with an input slew and note down the behaviour of the cell(delay, setup/hold time, etc) witha particular load at the output.

Since the behaviour of the cell (lets talk of delay simply) depends on the temperature, voltage (assuming Process is constant), inshort PVT, hence you cannot ignore these parameters while characterizing the cell. e.g delay at 50degrees would not be same as delay at 60degrees.

Hope this helps!

 

[master_picengineer]

Hi,
For me it is enougth to do it at 27 °C.