SPRUIE9D May 2017 – May 2024 DRA74P , DRA75P , DRA76P , DRA77P
Bits 25:24, this field indicates the type of payload is associated with command descriptor, and thus how to handle the payload.
A 0 indicates that the payload consists of blocks of data with each block having an address and length. The first word after a sub-block contains the next address and length in bytes. This allows for writing to multiple configuration regions in a client. The Configuration Descriptor word1 is the first address and length pair. All addresses used must be larger then the previous address for all destinations except for the MMR destination. If a sub block length is not evenly divisible into 16 then zeroes should be padded in the payload so that the Next Client Address and Length field start on a 16 byte boundary.