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tilelink: remove obsolete addr_lo signal (#895)

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When we first implemented TL, we thought this was helpful, because
it made WidthWidgets stateless in all cases. However, it put too
much burden on all other masters and slaves, none of which benefitted
from this signal. Furthermore, even with addr_lo, WidthWidgets were
information lossy because when they widen, they have no information
about what to fill in the new high bits of addr_lo.
This commit is contained in:
Wesley W. Terpstra
2017-07-26 16:01:21 -07:00
committed by GitHub
parent 3cceb866cf
commit 9804bdc34e
19 changed files with 45 additions and 80 deletions
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src/main/scala/tilelink/Fragmenter.scala
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@ -190,7 +190,6 @@ class TLFragmenter(val minSize: Int, val maxSize: Int, val alwaysMin: Boolean =
out.d.ready := in.d.ready || drop
in.d.valid := out.d.valid && !drop
in.d.bits := out.d.bits // pass most stuff unchanged
in.d.bits.addr_lo := out.d.bits.addr_lo & ~dsizeOH1
in.d.bits.source := out.d.bits.source >> addedBits
in.d.bits.size := Mux(dFirst, dFirst_size, dOrig)