wt's the cell Library format for decoder..

Hi friends,
..........I need a help regarding standard cell Library format for decoder. there are some std cell lib format for adder,clk etc but i could not findout the lib format for decoder... did the select lines for example s0 s1 also been tabulated in the lookup table along with the input pins.

..........And in adder should the two outputs are also been tabulated in the lookup table.

BY
Muthamil

Make the cell specification by urself only, after that paste it in the library(extension .lib) file which you currently using. Read this library again by either LC or DC shell. That's all i know, hope that it can help you a little bit.

Thanks atena for your reply
.......i am getting how to add our library design in the previous lib file. but i need the default structure like what should be added in decoder input list and output list. that is do we have to include the select lines in decoder as input pin.

like

pin(a){
diection:input;
}
pin(b){
diection:input;
}
then wt about s0 and s1. should i have to induce it to output and measure the value based on tht

By
Muthamil

Muthamil, the structure you are having is the simplest one. Once if you want to introduce (totally brand new element) to your library you have to take in consider 3 problems.
1st : The cell's specification (here is the decoder) must be added to your Verilog Lib or VHDL Package.
2nd : The cell functioning, pin direction as well as its parasitics characteristic as well as the match in timming and power model as you have in your current working library. This is the most complicated,difficult step, if you have a team work it will be easier for you ( elseif you are alone -like me) you have to go thru either HDL-A or HDL-AMS or Spice and Nt_shell and NanoSim to build your cell and do power and timming analysis.
3rd : You have to add the cell's shape in your symbolic library also.

If you have to build your own cell, these are the detailed steps that i know. Otherwise just simply build the decoder by Logic Gates ..... Anyway all the best..

Thanks atena for your reply
Ya i am working(alone as u) on it as you specified.

BY
Muthamil