BDM Connector Information
34
USB TAP Users Guide
1
4.7Ohm pull-up to buffered TGT PWR.
2
100KOhm pull-up to buffered TGT PWR.
20
GND
- n/a -
21
Reserved
- n/a -
22
Reserved
- n/a -
23
GND
- n/a -
24
PSTCLK
From target
30pF load
25
Core Voltage
- n/a -
26
TEA
From USB TAP
connector
50mA driver
2
Table C.2 CodeWarrior USB TAP for BDM Signal Recommendations and Requirements
BDM
Pin
Signal
Mnemonic
Requirement
1
Reserved
Need not be wired to the target. The USB TAP does not
currently use this signal.
2
BKPT
Must be wired to the target.
3
GND
Must be wired to the target. GND is connected directly the
USB TAP ground inside the USB TAP.
4
DSCLK
DSCLK must be connected to the target’s processor. It is
driven by the USB TAP as an output with up to 50mA. This
signal is the clock for the BDM 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.
5
GND
Must be wired to the target. GND is connected directly the
USB TAP ground inside the USB TAP.
6
Reserved
Need not be wired to the target. The USB TAP does not
currently use this signal.
Table C.1 CodeWarrior USB TAP Emulator for BDM Signal Directions (
continued)
BDM
Pin
Signal
Mnemonic
Signal
Direction
Description
U SB_TA P.book Page 34 Thursday, N ovem ber 10, 2005 2:27 PM
