Spi Interface - Avnet COM Express MSC C6C-AL User Manual

2.12.15 SPI Interface

Signal Pin Signal Power
Type Level Rail
SPI_CS# O CMOS 1.8V Sus 1.8V
SPI_MISO I CMOS 1.8V Sus 1.8V
SPI_MOSI O CMOS 1.8V Sus 1.8V
SPI_CLK O CMOS 1.8V Sus 1.8V
1.8V Sus
SPI_POWER O Power
BIOS_DIS I CMOS 3.3V Sus 3.3V
[1:0]#

NOTICE: SPI power rail is 1.8V.
MSC C6C-AL
Rem. PU/PD/SR Description
/ Tol.
ePU = 47 KΩ
Chip select for Carrier Board SPI - may be sourced from chipset SPI0 or SPI1.
eSR = 22 Ω
eSR = 22 Ω
Data in to Module from Carrier SPI.
eSR = 22 Ω
Data out from Module to Carrier SPI.
eSR = 22 Ω
Clock from Module to Carrier SPI.
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.
ePU = 10 KΩ Selection straps to determine the BIOS boot device.
BIOS_DIS[1:0]#
1 1
1 0
0 1
0 0
MSC C6C-AL User Manual
SPI_CS1# SPI_CS0# Carrier
Destination Destination SPI_CS
#
Module Module HIGH
Module Module HIGH
Module Carrier SPI0
Carrier Module SPI1
Source /
Target
AL SOC
AL SOC
AL SOC
AL SOC
SPI BIOS
Descriptor
Entry
Module SPI0/SPI1
Module Carrier FWH
Carrier SPI0/SPI1
Module SPI0/SPI1
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