[libre-riscv-dev] [Bug 318] fix LDSTCompUnit

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=318

--- Comment #5 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
one important set of API conventions:

* L0CacheBuffer's operating conventions are that the address must be
  *EXTERNALLY* sustained and held, as must its associated addr_ok
  line.

* this is because otherwise L0CacheBuffer itself has to have an
  address latch

* strictly speaking, LDSTCompUnit does not need an actual latch
  for the address *at all*.

* the reason is because, as you can see from the diagram
  https://libre-soc.org/3d_gpu/ld_st_comp_unit.jpg

  all of the information necessary to "fire" the adder and make
  the address "valid" is *already latched* and will *remain*
  latched until the busy signal is released.

  - op2 is latched
  - the immediate is latched

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