Bios Disable Signals - Seco CCOMe-C30 User Manual

3.3.22 External BIOS Flash Socket
External BIOS Flash socket - CN36
Pin Signal Pin
1 SPI_CS# 8
2 SPI_MISO 7
3 SPI_WP# 6
4 GND 5
SPI_HOLD#: this signal too is tied, through a 10kΩ 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

below.
JP12 position JP11 position
Not inserted Not inserted
Not inserted Inserted
Inserted Not inserted
Inserted Inserted
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.
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.
Signal
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.
SPI_POWER
Almost all signals on this socket come directly from COM Express connector CN1, with the
SPI_HOLD#
following exceptions:
SPI_CLK
SPI_WP#: this signal is tied, through a 10kΩ resistor, to SPI_POWER signal. This means that when
SPI_MOSI
the Flash is powered, the protection from writing is automatically removed.
, there are two jumpers JP11 and JP12, which allow configuring the BIOS_DIS[0..1]# signals according to the table
Chipset SPI CS1# Chipset SPI CS0#
Destination Destination
Module Module
--- ---
Module Carrier
Carrier Module
Carrier SPI Descriptor BIOS Entry
SPI_CS#
High Module SPI0/SPI1
High --- Not used
SPI0 Carrier SPI0/SPI1
SPI1 Module SPI0/SPI1
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