Cadence Standard Cell P&R Particulars
We will use a tool called Silicon Ensemble for standard cell placement and routing
Requirements
- Pins should align at a grid point (aligned with both vertical and horizontal grids)
- Rows are placed to align with vertical and horizontal routing grids
- Cell height should be multiple of Horizontal grid
- If multiple horizontal grids (i.e, HVH), then cell height should a common multiple of the grid spacing. If the M1 grid spacing is 6 lambda, and the M3 grid spacing is 8 lambda, then cell height should be an multiple of both 6 and 8 (ie., 24 lambda, 48 lambda, etc)
- For this reason, the ratio of M1 to M3 grid spacing should be kept simple (i.e 1:1, 2:1, NOT 11:7 )