Bug 338 - CompUnitALU needs go_die to be wired to ALU shadow mask
Summary: CompUnitALU needs go_die to be wired to ALU shadow mask
Status: CONFIRMED
Alias: None
Product: Libre-SOC's first SoC
Classification: Unclassified
Component: Source Code (show other bugs)
Version: unspecified
Hardware: PC Mac OS
: --- enhancement
Assignee: Luke Kenneth Casson Leighton
URL:
Depends on:
Blocks: 81
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Reported: 2020-05-22 17:16 BST by Luke Kenneth Casson Leighton
Modified: 2020-09-21 16:55 BST (History)
1 user (show)

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NLnet milestone: NLnet.2019.02
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Description Luke Kenneth Casson Leighton 2020-05-22 17:16:20 BST
this is for ALU cancellation.  when go_die is pulled on a Comp Unit, it indicates
that the result - computed or in transit to *be* computed - is no longer required
and must be dropped on the floor, immediately.

ALU pipelines are to be set up with "cancellation" capability.  this is set
from nmutil.concurrentunit.ReservationStations "maskwid" parameter, which is
set one per CompUnit.  with the cancellation mask being N bits wide,
N go_die CompUnits may be connected together on the front, one go_die signal
to each cancellation mask bit.