Rework the CCU to improve performance #5
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* The original FSM is now split across three modules: decoder, memory_unit and snoop_unit. * The top level design is now identified as ccu_ctrl * Legacy parameter is used to simulate a blocking behavior
* Rework the memory unit to use AXI channels parallelism * Use AXI FIFO to buffer memory transactions * Several bug fixes * Remove Legacy support
* Checks are currently performed by stalling requests targeted at the same set
* Stall the decoder W/R requests if the respective queue is full * Collision now happens on equal tags
* Add one ID bit on the memory side * Add W FIFO to decouple Ax controller and W channel
* Use req/gnt protocol * Serve request in the same cycle if possible
Rework the design to reduce latency
Add perf events, rework the AC control
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@niwis, do you think we can merge this pull request? Further active development will be needed, but we can start from this version and set it as our baseline. |
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The CCU was reworked to: