tree 94baca522855f76ccd06806a466fe4990095677d
parent 619e3124398b90f562aa6eb18834514fcaf53ea9
author Martin Lueker-Boden <martin.lueker-boden@wdc.com> 1634334272 -0700
committer Martin Lueker-Boden <47870387+martin-lueker@users.noreply.github.com> 1634679355 -0700

[ spi_host rtl ] Prepare to move entire SPI_HOST IP the peripheral clock domain

This is the first of two commits which aim to standardize the CDC strategy for SPI_HOST

In this first commit:

- An explicit tlul_async_fifo is created inside spi_host.sv. This FIFO will eventually move
  to the TLUL fabric or the register interface.  However putting it inside the IP for now
  allows for testing of changes to other blocks without changing the interface, which would
  disrupt DV testing.

- The command_cdc has been removed in favor of a shallow synchronous FIFO in
  spi_host_command_queue.

- spi_host_data_cdc with its async fifos have also been removed in favor
  of spi_host_data_fifos, in which the fifos are synchronous

Pending until next commit:

- Migration of TLUL fifo to some automated system (TLUL fabric? Regtool?)
- Removal of "Core" clocks & resets
- Change COMMAND register to hw_ext
- DV Interface updates to change clocks

Signed-off-by: Martin Lueker-Boden <martin.lueker-boden@wdc.com>