Freescale Semiconductor P&E Tracelink, Руководство пользователя, Страница: 14 / 39

Tracelink User Manual 11
TCK Output Debug communication signal. Pull-up resistor
required. This signal is currently only used by
P&E when unsecuring ColdFire processors
with internal flash.
Recommended.
RESET I/O Microprocessor reset signal. This signal is
driven low during initial debug mode entry.
Pull-up resistor is required.
Required.
DSI Output Debug communication signal. Pull-up resistor
recommended.
Required.
TVCC Input Target reference voltage. Needs to be con-
nected to the microprocessor’s operating volt-
age (1.8V to 5V) and is used by the Tracelink
to determine the correct voltage level to use on
output signals.
Required.
DSO Input Debug communication signal. Pull-up resistor
recommended.
Required.
PST[3:0]/
PSTDDATA[7:4]
Input Trace data input. Required for external trace
capture.
DDATA[3:0]/
PSTDDATA[3:0]
Input Trace data input. Required for external trace
capture.
PSTCLK Input Trace clock input. Required for external
trace capture.
TA Output Transfer acknowledge signal. Pull-up resistor
is required. Some ColdFire processors do not
implement this signal and this pin can be left
as a no connect (NC) in these cases.
Highly
recommended for applications which use
external memory.
Table C-1. ColdFire V2/3/4 Signals (PORT C)
Signal Direction Description