Freescale Semiconductor metrowerks CodeWarrior User Manual page 35

Table B.2 CodeWarrior USB TAP for DPI Signal Recommendations and
Requirements
DPI
Pin
1
2
3
4
5
6
7
8
9
10
USB TAP Users Guide
Signal Requirement
Mnemonic
VLSO/FRZ VFLS0/FRZ is not needed for emulation.
SRST Must be wired to the target. During reset, the USB TAP drives
SRST to ground through a 100Ohm resistor.
GND Must be wired to the target. GND is connected directly to the
USB TAP ground inside the USB TAP.
DSCK Must be wired to the target processor. It is driven by the USB
TAP as an output with up to 50mA. This signal is the clock for
the DPI interface. It is good design practice to keep the trace
length short and isolate the trace from other signals. If the trace
must be long, then termination may be needed.
GND Must be wired to the target. GND is connected directly to the
USB TAP ground inside the USB TAP.
VFLS1/FRZ VFLS1/FRZ is not needed for emulation.
HRST Must be wired to the target. During reset, the USB TAP drives
HRST to ground through a 100Ohm resistor.
DSDI Must be wired to the target processor. The USB TAP emulator
drives the TDI output with up to 50 mA.
VDD Must be wired to the target. The USB TAP emulator uses this
signal to determine if power is applied to the target. This signal is
also used as a voltage reference for the signals driven by the
USB TAP emulator (SRST, SDCK, HRST, DSDI).
DSDO Must be wired to the target processor. DSDO is an output from
the target processor and an input to the USB TAP emulator. It is
good design practice to keep the trace length short and isolate
the trace from the other signals.
DPI Connector Information
35