READI Module
MPC561/MPC563 Reference Manual, Rev. 1.2
24-36
Freescale Semiconductor
Figure 24-16. Enabling Program Trace Out of System Reset
24.7.7
READI Signals
The READI signals support Nexus (IEEE-ISTO 5001-1999) auxiliary port interface for debug. There are
two modes available, full port mode and reduced port mode. Reduced port mode allows for a 1 bit input
stream and a 2 bit output stream. Full port mode allows for a 2 bit input stream and an 8 bit output stream.
See
for READI mode selection.
Steps to Enter READI (Nexus) mode:
1. Negate PORESET while holding JCOMP/RSTI low.
2. Configure TMS/EVTI and TDI/DSDI/MDI[0] while JCOMP/RSTI is low. (EVTI = low to enable
Nexus)
3. Negate JCOMP/RSTI.
4. If MDI[0] is high at JCOMP/RSTI negation, then full port mode is enabled otherwise Reduced
mode is selected.
To exit READI mode:
1. Reassert JCOMP/RSTI to disable READI.
Figure 24-17. READI Mode Selection
24.7.7.1
Reset Configuration for Debug Mode
To enable RCPU development access via the READI signals, the reset sequence outlined below should be
used:
•
Assert READI reset (RSTI), event-in (EVTI) and system reset (HRESET)
•
Negate RSTI
•
Upon negation of RSTI, tool should configure the DOR, DME, and DPA fields in the DC register
to desired setting.
•
Tool negates HRESET at least 16 system clocks after receiving the device ready message
Refer to
for further details.
PORESET
JCOMP/RSTI
TMS/EVTI
MDI0
READI-Config
JTAG disabled
READI
READI-Config
READI
T
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...