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3.3.10. USB Root Segmentation
3.3.11. SPI (BIOS only)
Signal
Pin #
Description
SPI_CS#
B97
Chip select for Carrier Board SPI BIOS Flash.
SPI_MISO
A92
Data in to module from carrier board SPI BIOS flash.
SPI_MOSI
A95
Data out from module to carrier board SPI BIOS flash.
SPI_CLK
A94
Clock from module to carrier board SPI BIOS flash.
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
BIOS_DIS0#
A34
Selection strap to determine the BIOS boot device.
BIOS_DIS1#
B88
Selection strap to determine the BIOS boot device.
I/O
PU/PD
O 3.3VSB
PU 10K 3.3VSB
I 3.3VSB
O 3.3VSB
O 3.3VSB
O P 3.3VSB
I
PU 10K 3.3VSB
I
PU 10K 3.3VSB
cExpress-BL
Comment
Carrier shall pull to
GND or leave no-
connect.
Carrier shall pull to
GND or leave no-
connect
Page 21
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