READI Module
MPC561/MPC563 Reference Manual, Rev. 1.2
24-22
Freescale Semiconductor
24.7.2
Functional Block Diagram
depicts the functional block diagram of the signal interface.
.
Figure 24-11. Functional Diagram of Signal Interface
The signal interface is responsible for handshaking with the message queue and registers. It is also
responsible for requesting new messages from the message queue. A message is always requested from
the message queue if the message queue is not empty, the message buffer is available and a higher priority
message is not requesting to be transmitted. The rate at which data is removed from the queue depends on
the average message length, the number of MDO signals, and the MCKO clocking rate.
24.7.3
Message Priority
Message formatting is performed in the signal interface block. The following priority scheme is
implemented for messages sent to the signal output formatter block, with 1 being the highest priority and
5 being the lowest priority:
1. Invalid message
2. READI register access handshakes (device ready/download information)
3. Watchpoint messages
4. Read/write access message
5. RCPU development access message
Control Unit
Signal Interface
Trace messages from Queue
Data to READI
Output Formatter
Input Formatter
MDO[7:0]
MDI[1:0]
MC
KO
MS
EO
M
SEI
MC
KI
RSTI
EVTI
MUX
BUF
BUF
Auxiliary messages
Watchpoint message
RCPU Dev. Port message
Data
Control
Invalid Message
R/W Access message
Registers
Summary of Contents for MPC561
Page 84: ...MPC561 MPC563 Reference Manual Rev 1 2 lxxxiv Freescale Semiconductor...
Page 144: ...Signal Descriptions MPC561 MPC563 Reference Manual Rev 1 2 2 46 Freescale Semiconductor...
Page 206: ...Central Processing Unit MPC561 MPC563 Reference Manual Rev 1 2 3 62 Freescale Semiconductor...
Page 302: ...Reset MPC561 MPC563 Reference Manual Rev 1 2 7 14 Freescale Semiconductor...
Page 854: ...Time Processor Unit 3 MPC561 MPC563 Reference Manual Rev 1 2 19 24 Freescale Semiconductor...
Page 968: ...Development Support MPC561 MPC563 Reference Manual Rev 1 2 23 54 Freescale Semiconductor...
Page 1144: ...Internal Memory Map MPC561 MPC563 Reference Manual Rev 1 2 B 34 Freescale Semiconductor...
Page 1212: ...TPU3 ROM Functions MPC561 MPC563 Reference Manual Rev 1 2 D 60 Freescale Semiconductor...
Page 1216: ...Memory Access Timing MPC561 MPC563 Reference Manual Rev 1 2 E 4 Freescale Semiconductor...