OMAP
TM
4 PandaBoard System
Reference Manual
Revision 0.4
September 22, 2010
DOC-21010
Page 48 of 83
J8 Pin #
OMAP
Ball #
Signal Name
Signal Description
1
AH1
H_JTAG_TMS
JTAG Test Mode Select
2
AH2
H_JTAG_NTRST
JTAG Test Reset (Active low)
3
AE1
H_JTAG_TDI
JTAG Test Data In
4,8,10,12 ----
DGND
Signal
Ground
5
---
VIO_1V8
1.8V JTAG Power
6 ---
----
N/A
7
AE2
H_JTAG_TDO
JTAG Test Data Out
9
AE3
H_JTAG_RTCK
JTAG Return Clock Out
11
AG1
H_JTAG_TCK
JTAG Clock In
13
M2
H_DPM_EMU0
Emulator I/O 0
14
N2
H_DPM_EMU1
Emulator I/O 1
Table 13: JTAG Connector Pinout (J8)
2.20
LED Indicators
The PandaBoard provides three LED indicators. See Figure 21 for the location of these three LEDs on
the Panda PCB.
LED D1 is a green LED that is controlled via OMAP4430 GPIO_WK7 (ball AC2). Writing this GPIO
high will turn on the LED, while writing it low will turn off the LED.
LED D2 is a green LED that is controlled via OMAP4430 GPIO_WK8 (ball AC3). Writing this GPIO
high will turn on the LED, while writing it low will turn off the LED.
LED D3 is a red LED that is controlled automatically via onboard circuitry. This LED being illuminated
indicates an overvoltage condition on the input DC supply (i.e. a supply of greater than 5V has been
plugged into P3). The supervisor IC at U20 on sheet 2 of the schematics monitors the voltage from the
DC input jack (through a voltage divider to set the appropriate threshold). If a DC supply of more than
5V is plugged into the PandaBoard, the U20 output reset will be negated, which will turn on the red LED
at D3 and disable load switches U15 and U17 on sheet 2 of the schematic, which will remove 5V power
to the remainder of the PandaBoard circuitry. This is intended to prevent damage to onboard circuitry.
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