
Introduction
93
December 2003 Revised March 2005
SPRS231D
Table 25. Signal Descriptions (Continued)
SIGNAL
TYPE
DESCRIPTION
ZZG
BALL#
ZDY
BALL#
RESET LOGIC PINS
PWRON_RESET
N8
R12
Reset input to device. Active-low asynchronous reset input resets the entire
OMAP5912 device.
I
MPU_RST
N14
U20
MPU reset input. Active-low asynchronous reset input resets the MPU core.
NOTE: MPU_RST must meet minimum specified pulse width requirements
and must be free of glitching to guard against potential operational issues.
I
RST_OUT
N12
AA20
Reset output. Active-low output is asserted when RST_OUT is active (after
synchronization).
O
INTERRUPTS AND MISCELLANEOUS CONTROL AND CONFIGURATION PINS
H14
J20
MPU boot mode. When MPU_BOOT is low, the MPU boots internally from
chip-select 0. When MPU_BOOT is high and if the device is an emulation
device, the MPU externally boots from chip-select 3 of EMIFS. Protocol
(address/data multiplexed or address/data non-multiplexed) is determined by
the value on GPIO1.
MPU_BOOT
I
BFAIL/EXT_FIQ
T17
W19
Battery power failure and external FIQ interrupt input. BFAIL can be used to
gate certain input pins when battery power is low or failing. The pins that can
be gated are configured via software. This pin can also optionally be used as
an external FIQ interrupt source to the MPU. The function of this pin is
configurable via software.
For more details, see the
OMAP5912 Multimedia Processor Power
Management Reference Guide
(literature number SPRU753).
I
EXT_DMA_REQ0
L12
N15
External DMA request. EXT_DMA_REQ0 provides DMA request inputs
which external devices can use to trigger system DMA transfers. The system
DMA must be configured in software to respond to these external requests.
I
EXT_DMA_REQ1
M14
T19
External DMA request. EXT_DMA_REQ1 provides DMA request inputs
which external devices may use to trigger system DMA transfers. The
system DMA must be configured in software to respond to these external
requests.
I
LOW_PWR
N16
T20
Low-power request output. This active-high output indicates that the
OMAP5912 device is in a LOW_PWR sleep mode. During reset and
functional modes, LOW_PWR is driven low. This signal can be used to
indicate a low-power state to external power management devices in a
system.
O
LOW_POWER
P4
W4
Inverted polarity of the LOW_PWR signal
O
RTC_ON_NOFF
P10
Y12
Active-low asynchronous reset signal if real-time clock (RTC) is used.
I
RTC_WAKE_INT
N9
W13
RTC wake-up interrupt. RTC periodic interrupt to external power device to
restart the main power supplies when RTC times out.
O
EXT_MASTER_REQ
T7
R10
External master request. If the base clock is provided by an external device
instead of an on-chip oscillator, a high level on this output indicates to the
external device that the clock must be driven. A low level indicates that the
OMAP5912 device is in sleep mode and the 12- or 13-MHz external clock
source is not necessary.
O
RST_HOST_OUT
N9
W13
A software-controllable reset or shutdown output to an external device
O
CONF
I = Input, O = Output, Z = High-Impedance
R14
V18
OMAP5912 configuration input. Must be tied low for normal operations.
I