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5.13
SPI Flash Header
The conga-MEVAL provides header X20 for connecting SPI flash by default. An optional 8-pin SOIC socket can be provided by request (BOM
option). Use DIP M13 to select the flash device to boot from.
Table 39 X20 - SPI Flash Header
Pin Signal
Description
Pin Signal
Description
1
SPI_CS#
SPI Chip select
2
SPI_PWR
SPI power source from COM Express module
3
SPI_MISO
SPI data in from carrier board
flash to module
4
SPI_HOLD#
Stops serial communication temporary without
device reset
5
SPI_WP
SPI write protect
6
SPI_CLK
SPI clock from module
7
GND
Ground
8
SPI_MOSI
SPI data out from module to carrier board flash
Table 40 SW M13 - BIOS Boot Device Selection
SW1
SW2
Configuration
OFF
OFF
Boot from on-module firmware (default)
OFF
ON
Boot from carrier board SPI Flash (X20)
ON
OFF
Not supported
ON
ON
Not supported
Note
Use SPI flash that supports the module’s SPI power.
Connector Type
M13: DIP Switch
X20: 1.27 mm, 2 x 4-pin female header (board to board connection)
X20
8
1
5
4
1
2
0N
M13
