Freescale Semiconductor NXP CodeWarrior USB TAP, Руководство пользователя

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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