SPRUHZ7K August 2015 – April 2024 AM5706 , AM5708 , AM5716 , AM5718 , AM5718-HIREL
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.