Observations Summary
- track group segregation model for switch block design
- simpler mathematical analysis
- draw distinction between wire endpoints, midpoints
- try different endpoint models
- disjoint, universal, Wilton: Wilton better, also most diverse
- is Wilton better because it is diverse?
- different midpoint models
- makes traditional switch blocks more diverse
- checkerboard layout
- makes switch blocks even more diverse
- commutative switch blocks
- order of turns unimportant, switch blocks easier to analyse
- shifty similar to Wilton, but commutative
- can use to optimize diversity (cdf-design)
- diversity measurements
- cdf-design more diverse than shifty, disjoint
- checkerboard increases diversity of shifty, disjoint
- routing results of diverse switch blocks
- shifty consistenly uses less area
- more diversity didn't help!
- in all cases, area savings small (<4%)
- delay shows no trend, +/-4% typical
- is diversity worthwhile?
- diversity: rerouting a net moves it to a new track
- this creates conflicts with new nets, must reroute again
- diversity is difficult for existing CAD tools to exploit
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