Motorola MPC533 Reference Manual page 97

Table 2-1. MPC533 Signal Descriptions (continued)
Signal Name
BB / VF2 / IWP3
IWP[0:1] / VFLS[0:1]
TMS / EVTI
TDI / DSDI / MDI0
MOTOROLA
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
No. of Function
Type
Signals after Reset
I/O
Controlled by
RCW[DBGC]
O
1 See
Table 29-8
O
O
Controlled by
RCW[DBGC]
2 See
Table 29-8.
O
JTAG/BDM/READI
I TMS unless
the Nexus
(READI) port
1 is enabled,
I
then EVTI.
See section
25.5.
I DSDI unless
the Nexus
(READI) port
(MDI[0] is
I
enabled) or
1 JTAG mode
(TDI is
enabled) is
I
enabled. See
section 25.5.
Chapter 2. Signal Descriptions
Description
1
Bus Busy – Indicates that the master is using the external
bus. BB is an active-low signal and needs an external
pull-up resistor to ensure proper operation and signal
timing specifications.
Visible Instruction Queue Flush Status 2 – This output
signal together with VF0 and VF1 is output by the MPC533
when a program instructions flow tracking is required. VFs
report the number of instructions flushed from the
instruction queue in the internal core.
Instruction Watchpoint 3 – This output signal reports the
detection of an instruction watchpoint in the program flow
executed by the internal core.
Instruction Watchpoint [0:1] – These output signals report
the detection of an instruction watchpoint in the program
flow executed by the RCPU.
Visible History Buffer Flush Status [0:1] – These signals are
output by the MPC533 to enable program instruction flow
tracking. They report the number of instructions flushed
from the history buffer in the RCPU. See Chapter 23,
"Development Support," for details.
Test Mode Select – This input controls test mode
operations for on-board test logic (JTAG).
EVTI – Event in (EVTI) is level sensitive when configured
for breakpoint generation, otherwise it is edge sensitive.
Test Data In – This input is used for serial test instructions
and test data for on-board test logic (JTAG).
Development Serial Data Input – This input signal is the
data in for the debug port interface. See Chapter 23,
"Development Support," for details.
Message Data In – MDI0 is a NEXUS input signal used for
downloading configuration information, writes to user
resources, and so forth. Internal latching of MDI occurs on
the rising edge of MCKI.
Signal Summary
2-9