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power routing for pads

gops
I intend to use0.18um TSMC library .When i choose the IO library i came to see that each IO cell need two VDD supply voltages one VDD(1.8V) and another VDDPST(3.3V). Also i found the VDDPAD and VSSPAD are provided for both core and IOs. I dont understand why we need VDD pad for IOs. Can anybody please tell me the reason in detail. Also please tell me reagrding power routing for IO cells.
Parents
  • Hi Kari;
     
    What you told is right.My IO structure consists of several pieces.
     
    Any way can you please give me some details of how to route the IO ring for the following cases.
     
    a) Both core and IO at same voltage.
    b) Core and IO at different voltage.
     
    I think the VDD/VSS IO is rquired only for the second one. Can you please tell me the steps i need to follow for routing the IO ring in above two cases.
     
    Please tell me how to use a power cut cell in the design also.
     
    Thanks n regards
    gops
Reply
  • Hi Kari;
     
    What you told is right.My IO structure consists of several pieces.
     
    Any way can you please give me some details of how to route the IO ring for the following cases.
     
    a) Both core and IO at same voltage.
    b) Core and IO at different voltage.
     
    I think the VDD/VSS IO is rquired only for the second one. Can you please tell me the steps i need to follow for routing the IO ring in above two cases.
     
    Please tell me how to use a power cut cell in the design also.
     
    Thanks n regards
    gops
Children
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