Motorola MPC533 Reference Manual page 955

22.1.5.3 Reset Sequence Guidelines
Refer to Section 22.2.3, "READI Reset Configuration," for further details.
22.1.5.4 BDM Guidelines
Refer to Section 22.2.3.1, "Reset Configuration for Debug Mode," for further details.
22.2 Signal Interface
This section details information regarding the READI signals and signal protocol.
22.2.1 Functional Description
The READI signal interface provides the function of transmitting messages from the
message queues to the external tools. The signal interface also provides the control for
timing and logic for formatting the messages.
22.2.1.1 Signals Implemented
The READI module implements one MCKO, MCKI, EVTI, RSTI, MSEO, and MSEI
signal. It also implements one or two MDI and two or eight MDO signals. The input signals
are synchronized to the MCKI input clock and the output signals are synchronized to the
free running MCKO output clock. The READI signal definition is outlined in Table 22-17.
MCKI clock frequency has to be less than or equal to one half
of MCKO clock frequency.
IEEE-ISTO
Input/
5001 Signal
Output
Name
MCKO Output
MDO[7:0] or Output
MDO[1:0]
MSEO Output
MCKI Input
MOTOROLA
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
NOTE
Table 22-17. Description of READI Signals
Message Clock-Out (MCKO) is a free-running output clock to development tools for
timing of MDO and MSEO signal functions. MCKO is the same as the MCU system clock.
Message Data Out (MDO[7:0] or MDO[1:0]) are output signals used for uploading OTM,
BTM, DTM, and Read/Write Accesses. External latching of MDO will occur on rising edge
of MCKO. Eight signals are implemented. MDO[7:0] are used in full port mode, MDO[1:0]
are used in reduced port mode.
Message Start/End Out (MSEO) is an output signal which indicates when a message on
the MDO signals has started, when a variable length packet has ended, and when the
message has ended. 1 MSEO signal is implemented. External latching of MSEO will
occur on rising edge of MCKO.
Message Clock-In (MCKI) is a input clock from development tools for timing of MDI and
MSEI signal functions. MCKI frequency has to be less than or equal to one half of MCKO
frequency.
Chapter 22. READI Module
Description of Signal
Signal Interface
22-23