tree 2de7b9802557eaff66a95d1f6782559bda1a001c
parent e8d047c0f6ed77c492e8a00017db472884732b51
author Eunchan Kim <eunchan@opentitan.org> 1626902598 -0700
committer Eunchan Kim <eunchan@opentitan.org> 1627935309 -0700
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[spi_device] Add Last Read Address CSR

This commit adds last read address accessed by the host system. While
operating (SPI interface is in active), the CSR is not updated.

The CSB signal is synchronized into the bus clock domain and the logic
creates a pulse indicator. Then using the pulse signal, the logic
latches readbuf address from SCK domain into bus clock domain. It does
not create the CDC issue as the readbuf address won't be changed during
CSb is high.

Signed-off-by: Eunchan Kim <eunchan@opentitan.org>