Motorola APX 3000 Detailed Service Manual page 217

Troubleshooting Tables: List of Board and IC Signals
Signal Name
none OMAP GPIO1
determines default
state of some EMIFS
pins. Latched on rising
edge of
PWR_ON_RESET.
Pulled low on PCB
none "Unused, defaults to
UART2.BCLK in reset
mode 0. Pulldown on
PCB
omap_mpu_boot Pin pulled high on
PCB to select
external boot on
EMIFS CS3 (flash
memory)
reset_mode Determines reset
mode of OMAP.
Latched on rising
edge of
PWR_ON_RESET.
Pulled low on PCB
(mode 0).
mako_resetx "Master cold reset
input for entire 1710
chip, controlled by
Mako IC
mako_resetx "MPU (ARM9) subsys-
tem reset input, tied to
PWRON_RESET
(R12) on PCB
omap_reset "Reset output from
OMAP used for
CODEC, CPLD, Front
Display, Lighting
Controllers, MACE
Tamper ckt.
NC NC
NC NC
NC NC
NC NC
Table 7-7. Overall GPIO pin functions (Continued)
Pin or
Description
Ball #
R19
"Y4
J20
P12
"R12
"U20
"AA20
R18
Y8
W8
V8
SW Initialized
Active State
Direction
Input
Output
Input
Input
0 Input
0 Input
0 Output
Input
I/O
I/O
I/O
HW Reset
*
PU State Direction
Pull- 0 Input
down
None 0 Output
None 1 Input
None 0 Input
None Input
None Input
None 0 Output
Pull- Input
down
Pullup Input
Pullup Input
Pullup Input
7-9
*
PU or
PD
Pull-
down
None
None
None
None
None
None
Pull-
down
Pull-
down
Pull-
down
Pull-
down