Adam Izraelevitz

Add :<>=, which is a chisel3 API for FIRRTL.<= (to aid in migration from Chisel.:= and Chisel.<>)

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To migrate code from `Chisel._` to `chisel3._`, the bulk connect operators are very different, which requires a significant rewrite of every bulk connection. However, the old connect operator was actually...

### Contributor Checklist - [x] Did you add Scaladoc to every public function/method? - [ ] Did you add at least one test demonstrating the PR? - [x] Did you...

### Contributor Checklist - [ ] Did you add Scaladoc to every public function/method? - [ ] Did you add at least one test demonstrating the PR? - [ ]...

Separable PRs: - [x] Split InstanceSpec numbering into separate PR - [ ] Change to requirement of having IsInstantiable explicit vs implicit TODO(@azidar): - [x] Scaladoc for Proxy.scala - [x]...

### Contributor Checklist - [N/A] Did you add Scaladoc to every public function/method? - [x] Did you add at least one test demonstrating the PR? - [x] Did you delete...

[DRAFT] Contextual and Contexts

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This is a proposal for a new type, `Contextual`, which allows Chisel users to define values differently for instances of the same definition, but access them only outside the instance...

In general, Chisel's connection operators are very broken; their semantics change depending on `import Chisel._` vs `import chisel3._`. Even `chisel3._`'s semantics are not clean; you cannot reason about what will...

Lot's of TODO's

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- [ ] 3.3: Add better description of an Arbiter, and the arguments to the Arbiter constructor - [ ] 3.4: Never define scan, or what the Left or Right...

Add Incoming/Outgoing as alternatives to IO

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### Motivation First step in implementing what was discussed in this issue: https://github.com/chipsalliance/chisel/issues/2643 In short, `Incoming` and `Outgoing` provide a way to create input/output ports that does not "strip flips"...

Check that all IO's are marked @public, if used with D/I

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### Contributor Checklist - [ ] Did you add Scaladoc to every public function/method? - [ ] Did you add at least one test demonstrating the PR? - [ ]...