Motorola MPC533 Reference Manual page 1015

The DSDI message has the following format:
When sending in a DSDI data message, the DSDI data should
contain the control and status bits (start, mode, control),
followed by the 7 or 32-bit CPU instruction/data or trap enable,
MSB first. See Figure 22-84 for DSDI data message
transmission sequence.
22.9.1.2 DSDO Message
The DSDO message is used by the device to upload information from the RCPU.
The DSDO data field has a 3-bit status header followed by 7 or 32 bits of data/instruction,
depending on the RCPU development port mode.
The three status bits in the DSDO data indicates if the device is ready to receive the next
message from the tool.
The DSDO message has the following format:
The DSDO data received will contain the control and status bits
and data from the CPU, MSB first. See Figure 22-84 for DSDO
data message transmission sequence.
22.9.1.3 BDM Status Message
BDM status message is generated by the device to let the tool know about the status of
debug mode.
MOTOROLA
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
[6 bits]
[10 or 35 bits]
TCODE (56)
DSDI data
Max Length = 41 bits
Min Length = 16 bits
Figure 22-78. DSDI Message Format
NOTE
[6 bits]
[10 or 35 bits]
TCODE (57)
Max Length = 41 bits
Min Length = 16 bits
Figure 22-79. DSDO Message Format
NOTE
Chapter 22. READI Module
RCPU Development Access
DSDO data
22-83