ADLINK Express-CVC - Manual (Page 22)

Page 22 Express-CVC
3.3.10. 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 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
3.3.11. Miscellaneous
Signal Pin Description I/O PU/PD Comment
SPKR B32 Output for audio enunciator, the “speaker” in PC-AT
systems O 3.3V
WDT B27 Output indicating that a watchdog time-out event has
occurred. O 3.3V
KBD_RST# A86 Input to module from (optional) external keyboard
controller that can force a reset. Pulled high on the
module. This is a legacy artifact of the PC-AT. I 3.3V PU 10K 3.3V
KBD_A20GATE A87 Input to module from (optional) external keyboard
controller that can be used to control the CPU A20 gate
line. The A20GATE restricts the memory access to the
bottom megabyte and is a legacy artifact of the PC-AT.
Pulled low on the module. I 3.3V PU 10K 3.3V
THRM# B35 Input from off-module temp sensor indicating an over-temp
situation. I 3.3V
THERMTRIP# A35 Active low output indicating that the CPU has entered
thermal shutdown. O 3.3V
TPM_PP11 C83 Trusted Platform Module (TPM) Physical Presence pin.
Active high. TPM chip has an internal pull down. This
signal is used to indicate Physical Presence to the TPM. I 3.3V PD 3.3V If TPM not installed on
module than remove PD
3.3V