mITX-SKL-H – User Guide, Rev.1.1
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// 53
8.12.
SPI Connector (J9)
The SPI Connector is normally not used, it is for Kontron use. In case of BIOS corruption, it can be used to recover the
BIOS SPI chip via an external SPI Flash IC Programmer.
Figure 20: SPI Connector 12-Pin Connector
Table 25: Pin Assignment SPI Connector (J9)
Pin
Signal
Type
Ioh / Iol
Pull U / D
Note
1
CLK
2
SB3V3
PWR
3
CS0#
I
4
ADDIN
IO
- / 10 KΩ
5
V_SPI
10 KΩ /-
6
NC
7
MOSI
IO
10 K
Ω
/-
8
ISOLATE#
IO
100 K
Ω
9
MISO
IO
10
GND
PWR
11
SPI_I02_#WP
IO
1 K
Ω
/-
12
SPI_I03_#HOLD
IO
1 K
Ω
Signal Description
Signal
Description
CLK
Serial clock
V_SPI
3.3 V Standby voltage power line. Normal output power, but when the motherboard is turned
off, the on-board SPI Flash can be a 3.3 V power sourced via this pin.
SB3V3
3.3 V Standby voltage power line. Normal output power, but when the motherboard is turned
off, the on-board SPI Flash can be 3.3 V power sourced via this pin.
CS0#
CS0# Chip Select 0, active low
ADDIN
ADDIN input signal must be NC
MOSI
Master Output, Slave Input
ISOLATE#
The ISOLATE# input, active low, is normally NC, but must be connected to GND when
programming the SPI flash. The power supply to the motherboard must be turned off when
loading SPI flash.The pull up resistor is connected via diode to 5 V Standby.
MISO
Master Input, Slave Output
SPI_IO2_#WP
SPI Data I/O: A bidirectional signal used to support dual IO fast read, quad IO fast read and
quad output fast read modes. The signal is not used in dual output fast read mode.
SPI_IO3_#HOLD
SPI Data I/O: A bidirectional signal used to support dual IO fast read, quad IO fast read and
quad output fast read modes. The signal is not used in dual output fast read mode.
GND
Power Supply GND signal
1
3
5
7
9
2
4
6
8
10 12
11
