Standard Cells Layout Style
Single rows
One routing channel between each row.
This style is common on chips with only one metal layer, but also two metal layers.
Real world examples
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| FC1001 | PS1 GPU | HE83006 | VF4730-0001 | NY5C265C |
Sometimes the rows are alternated.
Real world examples
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| LC72130 | AMS V7308 | 61507-004 |
Double rows
This style is common on chips with only two metal layers.
Real world examples
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| W538T808 | SM8952 | IDT77V1254 |
Alternating rows with OTC routing
No routing channels.
This kind of layout style uses over-the-cell (OTC) routing.
Designs with more than three metal layers use OTC routing.
Real world examples
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| GPL169256 | ATMEGA8 | ICS1893Y-10 | PIC16LF1828 | W83627DHG |