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Help with spectre stimulus file for sram read.

rajrevanth61

Hello Experts,

 I have a spectre stimulus file for SRAM read operation , but when i include the file and simulate via the spectre, I am not getting the expected results, can anyone check if my stimulus file is correct or not.

simulator lang=spectre
global gnd!
vdd (vdd! 0) vsource dc=1
gnd (gnd! 0) vsource dc=0
ic Q=1 Qb=0 BL=1 BLB=1
v6 (WL 0) vsource type=pwl wave=[0 0 20n 0 22n 1 40n 1v 42n 0v]

 Please help me.

Thanks

Parents
  • rajrevanth61

    This is the schematic. I have initialized the conditions required for the read operation . i.e., I want to read a value of 1 so i have initialized Q as 1 and QR as 0. and for the read operation to take place both the bitlines have been initialized to 1. I have used PWL as the source for the word line(WL).


    These are the warnings I am getting when i try to simulate. are these warnings causing my output to be improper?

    Notice from spectre during topology check.
        Only one connection to the following 2 nodes:
            BL
            BLB
        No DC path from node `WL' to ground, Gmin installed to provide path.
    Warning from spectre during heuristic topology check - set topcheck=fixall to fix all floating nodes.
        WARNING (SPECTRE-7): No DC path from node `vdd!' to ground.
        WARNING (SPECTRE-7): No DC path from node `gnd!' to ground. 

Reply
  • rajrevanth61

    This is the schematic. I have initialized the conditions required for the read operation . i.e., I want to read a value of 1 so i have initialized Q as 1 and QR as 0. and for the read operation to take place both the bitlines have been initialized to 1. I have used PWL as the source for the word line(WL).


    These are the warnings I am getting when i try to simulate. are these warnings causing my output to be improper?

    Notice from spectre during topology check.
        Only one connection to the following 2 nodes:
            BL
            BLB
        No DC path from node `WL' to ground, Gmin installed to provide path.
    Warning from spectre during heuristic topology check - set topcheck=fixall to fix all floating nodes.
        WARNING (SPECTRE-7): No DC path from node `vdd!' to ground.
        WARNING (SPECTRE-7): No DC path from node `gnd!' to ground. 

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