Add PCA9506ish i/o expander logic block, deal with multi-targets and fix mux features #269
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Add input signal so that we can ignore requests to enable multiple mux channels concurrently, even across virtual pca9545s, and test cases to check this stuff. adds the phy consolidator and test
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This block works as an emulated PCA9506 I/O expander.
Tri-state logic control left to the user at the top. Pretty good test coverage on this one, and it leverages the common i2c target phy block like the mux also did.
This also adds a few more outputs (so backwards compatible changes) to the target phy to expose more info like start and stop which allows the upstream state machines to recover more gracefully.
This also fleshes out the missing "mixed-mode" i2c packets in the simulation controller where the controller can issue write-repeated-start-read type i2c transactions.
I added a multi-target consolidator, and multi-target test cases to both the I/O expander and the mux. Doing this uncovered a few bugs related to bus sharing, which have now been addressed and all the sims and the new and old test cases are running well.