ADLINK cExpress-BL - Manual (Page 21)

cExpress-BL Page 21
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