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Re: Details about level shifter and isolation cells
as quoted "Block A - OFF, Block B - OFF and Block C - ON"; Block C is inside Block B, when Block B is off, unknown values become might propagate to Block C which we don't want to see. Isolation cells at the inputs of C are to prevent those...
Power rails are laid out systematically in the floorplan where standard cells can be placed on "site" with power and ground connected to the rails. You may find the site info in the def and the power rail information in the special net section.
I would consider metal1 power and ground are rail...
Usually cells are placed with power and ground rails (metal1) connected.
power and ground stripes are the power building network which hook up power and ground from the lower layer (including the power and ground rails from metal1) to the uppermost power and ground layer.
1. are the spacing errors systemic, happened to certain cells?
what I mean is if the spacing violations happened to certain cells only, you may use dont_use attribute on those cells to avoid those cells being used during the synthesis.
2. zone into one of the spacing violations,
measure the...
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