
Page 22 cExpress-BT2
Signal Pin # Description I/O PU/PD Comment
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
Ro w A/ B
HSIC 0
HSIC 1
XHCI Controller
EHCI Controller
P1 P2 P3 P4
P1-P4
SSP1P5
P6
USB0- / A45
USB0+/A46
USB1- / B45
USB1+/B46
USB2- / A42
USB2+ / A43
USB3- / B42
USB3+ / B43
USB4- / A39
USB4+ / A40
USB5- / B39
USB5+ / B40
USB6- / A36
USB6+ / A37
USB7- / B36
USB7+/B37
USB Hub
Port 0
(1.1/2.0)
Port 1
(1.1/2.0)
Port 2
(1.1/2.0)
Port 3
(1.1/2.0)
Port 4
(1.1/2.0)
Port 5
(1.1/2.0)
Port 6
(1.1/2.0)
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 Only support CS0
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 not- connected.
BIOS_DIS1# B88 Selection strap to determine the BIOS boot device. I PU 10K 3.3V Carrier shall pull to GND
or leave not- connected
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