SDML-WLU0 Series - User Guide, Rev. 1.0
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7.6.
SPI 10-pin Header (CN4)
The header CN4 is normally not used. It can be used to recover the BIOS SPI chip via an external SPI Flash IC
programmer in case of BIOS corruption.
Figure 17: SPI 10-pin Header CN4
Table 24: Pin Assignment CN4
Pin
Signal
Description
Note
1
VDD
3.3 V standby power supply
2
GND
Ground
3
CS1#
Chip select Line 1
4
CS0#
Chip select Line 0
5
HOLD#
Hold, to pause the device without deselecting the device
6
SO
Serial data output
7
SCK
Serial clock
8
WP#
Write protection
9
SI
Serial data input
10
EN
Connector Type
B2W, 2x5-pin, 2.0 mm pitch
