Protocol Specifications for ROSE

Protocol header

Rose will use a 20-byte header for its packets. The headers contain the following components:

CMD (8 bits): Contains the command to the fabric or interconnected devices, see Commands for details.
SRC (16 bits): Contains the packet source address.
DEST (16 bits): contains the packet destination address.
ID (32 bits): contains a packet identifier unique to the source in a large time frame.
RESERVED (64 bits): reserved for future iterations.
CRC (8 bits): reserved for future iterations incorporating CRC checksums.
LEN (16 bits): length of payload.

We will be using SPI in mode 0, where data is sampled on the falling edge of the clock pulse and shifted out on the rising edge.