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Spit xbar into two levels #301

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Spit xbar into two levels #301

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Commits on Nov 7, 2024

  1. Spit xbar into two levels 

    Attempt to reduce the depth of xbar logic on critical timing paths
to/from the HyperRAM/SRAM by moving most peripherals
from the main cross-bar to a new "peri" (peripheral) sub-crossbar.
Keeps addresses the same, but some few devices have increased
access latency due to being moved to xbar_peri or to improve QoR.

Blocks with increased access latency: timer, system_info, & hw_rev.

Blocks with decreased access latency: plic.
    @elliotb-lowrisc
    elliotb-lowrisc committed Nov 7, 2024
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