Some Basic Rules For Placing Macros
Macro placement
Once you have the size & shape of the floorplan ready and initialized the floorplan, thereby creating standard cell rows, you are now ready to hand place your macros. Do not use any auto placement, I have not seen anything that works. Flylines in your tool will show you the connection between the macros and standard cells or IOs.
- Use flylines and make sure you place blocks that connects to each other closer
- For a full-chip, if hard macros connect to IOs, place them near the respective IOs
- Consider the power straps while placing macros. You can club macros/memories
- Creating Power Rings and Straps
- Avoided the placement of macros in front of ports.
- Arranged the macros to get contiguous core area.
- Macro spacing given by space={[(no. of pins) * pitch] + space} / (no of metal layers in horizontal or vertical direction)
"Macro spacing given by space={[(no. of pins) * pitch] + space} / (no of metal layers in horizontal or vertical direction)"
ReplyDeleteis this pitch means metal to metal spacing?
but it might vary from metal to metal, so we can't take it as a constant for multiplication.
correct me if i'm wrong.
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Deletei thing in general we take the pitch of highest metal layer. that pitch value is provided in technology file.
Deletepitch = width +spacing
Deleteyes correct,the metal spaces varies metal to metal. but this formula not a thumb rule you can have extra spaces between macros. The pitch used here is, at-least we need to have spacing value of the metal layer used for Macro Pins.
ReplyDelete(no of metal layers in horizontal or vertical direction)"
ReplyDelete..
y we r not taking both
Which space value we have to give
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