CCOMe-C30
CCOMe-C30 - Rev. First Edition: 1.0 - Last Edition: 1.0 - Author: S.B. - Reviewed by F.B. Copyright © 2019 SECO S.p.A.
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3.3.22
External BIOS Flash Socket
In case that an external Flash is needed, then on the carrier board it is provided an
8-pin SOIC socket for the housing of SPI Flashes.
Socket is type LOTES p/n ACA-SPI-004-K0 or equivalent, p. 1.27mm, with the
pinout shown in the table on the left.
Almost all signals on this socket come directly from COM Express connector CN1, with the
following exceptions:
SPI_WP#: this signal is tied, through a 10k
Ω
resistor, to SPI_POWER signal. This means that when
the Flash is powered, the protection from writing is automatically removed.
SPI_HOLD#: this signal too is tied, through a 10k
Ω
resistor, to SPI_POWER signal. This means that when the Flash is powered, the Hold condition of serial
communication is automatically removed.
3.3.23
BIOS disable signals
, there are two jumpers JP11 and JP12, which allow configuring the BIOS_DIS[0..1]# signals according to the table
below.
External BIOS Flash socket - CN36
Pin Signal
Pin Signal
1
SPI_CS#
8
SPI_POWER
2
SPI_MISO
7
SPI_HOLD#
3
SPI_WP#
6
SPI_CLK
4
GND
5
SPI_MOSI
JP12 position JP11 position
Chipset SPI CS1#
Destination
Chipset SPI CS0#
Destination
Carrier
SPI_CS#
SPI Descriptor BIOS Entry
Not inserted
Not inserted
Module
Module
High
Module
SPI0/SPI1
Not inserted
Inserted
---
---
High
---
Not used
Inserted
Not inserted
Module
Carrier
SPI0
Carrier
SPI0/SPI1
Inserted
Inserted
Carrier
Module
SPI1
Module
SPI0/SPI1
