Page 20
cExpress-HL
Signal
Pin # Description
I/O
PU/PD
Comment
USB_2_3_OC#
A44
USB over-current sense, USB ports 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. .
I 3.3VSB
PU 10k 3.3VSB
Do not pull high on
carrier
USB_4_5_OC#
B38
USB over-current sense, USB ports 4 and 5. 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.
I 3.3VSB
PU 10k 3.3VSB
Do not pull high on
carrier
USB_6_7_OC#
A38
USB over-current sense, USB ports 6 and 7. 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.
I 3.3VSB
PU 10k 3.3VSB
Do not pull high on
carrier
3.3.10
USB Root Segmentation
3.3.11
SPI (BIOS only)
Signal
Pin # Description
I/O
PU/PD
Comment
SPI_CS#
B97
Chip select for Carrier Board SPI BIOS Flash.
O 3.3VSB
SPI_MISO
A92
Data in to module from carrier board SPI BIOS flash.
I 3.3VSB
SPI_MOSI
A95
Data out from module to carrier board SPI BIOS flash.
O 3.3VSB
SPI_CLK
A94
Clock from module to carrier board SPI BIOS flash.
O 3.3VSB
SPI_POWER
A91
Power supply for Carrier Board SPI – sourced from
Module – nominally 3.3V.
The Module shall provide a minimum of 100mA on
SPI_POWER.
Carriers shall use less than 100mA of SPI_POWER.
SPI_POWER shall only be used to power SPI devices
on the Carrier
O P 3.3VSB
BIOS_DIS0#
A34
Selection strap to determine the BIOS boot device.
I
PU 10K 3.3V
Carrier shall pull to
GND or leave no-
connect.
BIOS_DIS1#
B88
Selection strap to determine the BIOS boot device.
I
PU 10K 3.3V
Carrier shall pull to
GND or leave no-
connect
