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Low Power tip of the week: Power switch cells

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Here's this week's Low Power tip of the week:

Power switch cells: Make sure you ask your library provider if the switch cells (power gating cells) they provide are for column-style power switch insertion, or ring-style power switch insertion. Usually these two types of power gating cells are different! Some libraries may have both the column-style power switches and the ring-style power switches.

Feel free to post questions/comments on this...


Originally posted in cdnusers.org by wtan

  • hi,

    what is the difference between these two(column-style power switches and the ring-style power switches). You wrote like these two types of power gating cells are different!.

    Can you please let me know ............

    Thanks


    Originally posted in cdnusers.org by narasaiah

  • Hi Narasaiah,

               There are certain features to ring-style power switches. For example, in some ring-style power switches, if the power switches are laid down side by side (abutting), the input power pin of the switch cells will abut together. This eliminates the need for having a power ring built for the power switch ring.

               In addition, usually ring-style power switches come with a corner cell. The usage is obvious just like an IO ring, the corner cell of a ring-style switch cell library completes the input power pin ring.

    Thanks.
    regards,
    Wei Lii


    Originally posted in cdnusers.org by wtan

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