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Command:
sbt scalafmtAll
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Change source and other relevant files to use SPDX license
LICENSE file moved from src/ to ./
Changed license file to refer to this per recommendation
using_spdx_license_list_short_identifiers
WARNING: Tests fail with as of yet undiagnosed error
```
[error] Failed: Total 691, Failed 19, Errors 0, Passed 672, Ignored 15
[error] Failed tests:
[error] chiselTests.QueueSpec
[error] examples.VendingMachineGeneratorSpec
[error] chiselTests.HarnessSpec
[error] chiselTests.ConnectSpec
[error] chiselTests.aop.SelectSpec
[error] chiselTests.PopCountSpec
[error] chiselTests.CloneModuleSpec
[error] (Test / test) sbt.TestsFailedException: Tests unsuccessful
[error] Total time: 379 s (06:19), completed Sep 30, 2020 12:38:17 AM
sbt:chisel3>
```
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This migrates the tests to Chisel 3.4/FIRRTL 1.4. This primarily
involves removing usages of deprecated methods including:
- Remove usages of Driver
- Use ChiselStage methods instead of BackendCompilationUtilities
methods
- Use Dependency API for custom transforms
- Use extractCause to unpack StackError
Signed-off-by: Schuyler Eldridge <schuyler.eldridge@ibm.com>
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Changes the internal state of PRNG to use Vec[Bool] instead of UInt.
This fixes an @aswaterman identified future problem with asynchronous
reset.
A register with an asynchronous reset can only be reset to a literal.
Previously, an LFSR would store state as a UInt. If it was not
parameterized with a seed it should have its least significant bit
reset to something to avoid locking up. It's ideal to not reset the
full UInt (better test coverage, decreased reset fanout). However,
it's difficult to only reset one bit of a UInt. Conversely, it's
trivial to reset one bit of a Vec[Bool]. This also moves PRNG/LFSR
closer to a canonical representation of their internal state, i.e.,
it's natural to think of generalizing Vec[Bool] to arbitrary finite
fields (Vec[A <: Field]) whereas UInt is tightly coupled to GF2.
Minor updates:
- Updates/fixes to some scaladoc
- Add assertion to period test to make sure LFSR is changing
Signed-off-by: Schuyler Eldridge <schuyler.eldridge@ibm.com>
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Add LFSR tests using LFSR16 testing infrastructure. This also adds
tests that are the same as the examples shown for LFSR scaladoc.
Signed-off-by: Schuyler Eldridge <schuyler.eldridge@ibm.com>
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