13. I/O ? Connector ? Descriptions ?
JTAG ? Connector ? – ? J3 ?
The ? SOMDIMM ‐ LPC2478 ? uses ? a ? new, ? reduced ? size ? JTAG ? connector ? based ? on ? a ? 2mm ? Header. ? This ? smaller ?
connector ? provides ? 100% ? of ? the ? functionality ? of ? the ? standard ? 20 ‐ pin ? JTAG ? connector, ? but ? utilizes ? 70% ? less ?
board ? space. ? The ? connector ? is ? a ? standard ? part ? available ? from ? most ? major ? vendors. ?
?
Pin ? Number ?
1 ?
2 ?
3 ?
4 ?
5 ?
6 ?
7 ?
8 ?
9 ?
10 ?
Description ?
3.3V ?
TRSTn ?
TDI ?
TMS ?
TCK ?
RTCK ?
TDO ?
Reset ?
Ground ?
5.0V ?
?
For ? users ? that ? may ? have ? existing ? JTAG ? debuggers, ? an ? adapter ? may ? be ? fabricated ? using ? the ? following ? wiring ?
diagram: ? (part ? numbers ? for ? the ? connectors ? are ? included ? from ? both ? the ? manufacturer ? and ? Digi ‐ key) ?
?
?
Figure ? 5 ? – ? Mini ? JTAG ? Adapter ? Wiring ? Diagram ?
?
13 ?
?
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