Freescale Semiconductor metrowerks CodeWarrior User Manual page 45

Table D.2 CodeWarrior USB TAP for OnCE Signal Recommendations and
Requirements
OnCE
Pin
1
2
3
4
5
6
7
8
9
10
11
USB TAP Users Guide
Signal Requirement
Mnemonic
TDI Must be wired to the target processor. The USB TAP emulator
drives the TDI output with up to 50 mA. The TDI trace should be
kept short and maintain a "two-signal-width" spacing from any
other parallel dynamic signal trace. TDI should have an RC
termination option at the processor.
GND Must be wired to the USB TAP. GND is connected directly to the
USB TAP ground inside the USB TAP.
TDO Must be wired to the target processor. TDO is an output from the
target processor and input to the USB TAP emulator. The TDO
trace run should be kept short and maintain a "two-signal-width"
spacing from any other parallel dynamic signal trace. TDO
should have a series termination resistor located near the target
processor.
GND Must be wired to the USB TAP. GND is connected directly to the
USB TAP ground inside the USB TAP.
TCK Must be wired to the target processor. The USB TAP emulator
drives the TCK output with up to 50 mA. The TCK trace run
should be kept as short as possible and maintain a "two-signal-
width" spacing from any other parallel dynamic signal trace.
Must be wired to the USB TAP. GND is connected directly to the
GND
USB TAP ground inside the USB TAP.
Reserved Not required for emulation.
No-Connect/ Not required for emulation. Pin 8 should be clipped on the target
Key OnCE header.
RESET Must be wired to the target processor. The USB TAP drives the
RESET output with 50mA. During reset, the USB TAP drives
RESET to ground through a 100Ohm resistor.
TMS Must be wired to the target processor. The USB TAP emulator
drives the TCK output with up to 50mA. The TCK trace run
should be kept as short as possible and maintain a "two-signal-
width" spacing from any other parallel dynamic signal trace.
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 (TDI, TCK, TMS, RESET, and TRST).
OnCE Connector Information
45