SPRUIE9D May 2017 – May 2024 DRA74P , DRA75P , DRA76P , DRA77P
The keyboard module uses a posted-read scheme for reading any internal register. The read transaction is immediately acknowledged on the L4 interface. The value of the functional register to be read must be previously synchronized. This has the advantage of not stalling the interconnect system or the CPU that requested the read transaction.
The posted-read scheme can be used only if Freq(KBD_FCLK) < Freq(KBD_ICLK)/4.