Spi Bus (Bios Only) - ADLINK Technology AMD COM Express Express-VR7 User Manual

Express-VR7 User's Guide
4.3.7

SPI Bus (BIOS only)

Name 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.
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I/O
O 3.3VSB
I 3.3VSB
O 3.3VSB
O 3.3VSB
O P 3.3VSB
I
I
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PU / PD Comment
PU 10K
3.3VSB
PU 10K Carrier shall pull to GND or leave not connected.
3.3VSB
PU 10K Carrier shall pull to GND or leave not connected
3.3VSB
PICMG COM.0 R3.1