Kontron ETXexpress-WPM, Руководство пользователя, Страница: 79 / 98

ETXexpress-WPM User’s Guide page 79
USB Pin Type Pwr Rail /
Tolerance
Description
USB[0:3]+
USB[0:3]- I/O
USB 3.3V / 3.3V
Suspend USB differential pairs, channels 0 through 3
USB_0_1_OC# I
CMOS
3.3V / 3.3V
Suspend USB over-current sense, USB channels 0 and 1. A pull-up for this line
shall be present on the module. An open drain driver from a USB
current monitor on the Carrier Board may drive this line low. Do not
pull this line high on the Carrier Board.
USB_2_3_OC# I
CMOS
3.3V / 3.3V
Suspend USB over-current sense, USB channels 2 and 3. A pull-up for this line
shall be present on the module. An open drain driver from a USB
current monitor on the Carrier Board may drive this line low. Do not
pull this line high on the Carrier Board.
LPC Interface Pin Type Pwr Rail /
Tolerance
Description
LPC_AD[0:3] I/O
CMOS
3.3V / 3.3V LPC multiplexed address, command and data bus
LPC_FRAME# O
CMOS
3.3V / 3.3V LPC frame indicates the start of an LPC cycle
LPC_DRQ[0:1]# I
CMOS
3.3V / 3.3V LPC serial DMA request
LPC_SERIRQ I/O
CMOS
3.3V / 3.3V LPC serial interrupt
LPC_CLK O
CMOS
3.3V / 3.3V LPC clock output - 33MHz nominal
Miscellaneous Pin Type Pwr Rail /
Tolerance
Description
I2C_CK O
CMOS
3.3V / 3.3V General purpose I
2
C port clock output
I2C_DAT I/O OD
CMOS
3.3V / 3.3V General purpose I
2
C port data I/O line
SPKR O
CMOS
3.3V / 3.3V Output for audio enunciator - the "speaker" in PC-AT systems
BIOS_DISABLE# I
CMOS
3.3V / 3.3V Module BIOS disable input. Pull low to disable module BIOS.
Used to allow off-module BIOS implementations.
WDT O
CMOS
3.3V / 3.3V Output indicating that a watchdog time-out event has occurred.
KBD_RST# I
CMOS
3.3V / 3.3V Input to module from (optional) external keyboard controller that
can force a reset. Pulled high on the module. This is a legacy
artifact of the PC-AT.
KBD_A20GATE I
CMOS
3.3V / 3.3V Input to module from (optional) external keyboard controller that
can be used to control the CPU A20 gate line. The A20GATE
restricts the memory access to the bottom megabyte and is a
legacy artifact of the PC-AT. Pulled low on the module.