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KTD-N0903-C
Page 36
Internal Connectors
7.14 SPI Connector (SPI – J16)
The mITX-E38 provides one synchronous full duplex SPI (Serial Peripheral Interface) Bus in a 10 pin header
connector. The connector is type Pinrex 512-90-10GBE5 or similar.
Two things should be considered:
1.
An onboard SPITM flash coexists on the same interface lines. You must disable this component with a
3.3V power connection to the ADDIN signal (e.g. a short circuit jumper between pin 2 and 4).
2.
The four SPITM lines are protected with an additional bus driver and the ISOLATE# signal controls the
output enable pin. For normal operation this signal should be high.
Header
(Always On)
(Fan Sys)
Signal
SPI_CLK
3.3V
Pin
Signal
Description
Type
1
SPI_CLK
SPI clock
O-3.3
2
3.3V
Power +3.3V
PWR
3
SPI_CS#
SPI slave select, active low
O-3.3
4
ADDIN
Disable onboard SPI flash
I-3.3
5
RSVD
Reserved (10k pullup to 3.3V)
PWR
6
N.C.
Not connected
NC
7 SPI_MOSI SPI master output, Slave Input IO-3.3
8 ISOLATE#
Disable the SPI interface
I-3.3
9 SPI_MISO SPI master input, Slave Output IO-3.3
10
GND
Ground
PWR
Description
Serial Clock
3.3V Standby Voltage power line. Normally output power, but when Motherboard is
turned off then the on-board SPI Flash can be 3.3V power sourced via this pin.
SPI_CS#
CS# Chip Select, active low.
ADDIN
ADDIN input signal must be NC.
SPI_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. Power Supply to the Motherboard must be turned off when
loading SPI flash. The pull up resistor is connected via diode to 5VSB.
SPI_MISO
Master Input, Slave Output
SPI Data I/O: A bidirectional signal used to support Dual IO Fast Read, Quad IO Fast Read
SPI_IO2_#WP
and Quad Output Fast Read modes. The signal is not used in Dual Output Fast Read mode.
SPI Data I/O: A bidirectional signal used to support Dual IO Fast Read, Quad IO Fast Read
SPI_IO3_#HOLD
and Quad Output Fast Read modes. The signal is not used in Dual Output Fast Read mode.
mITX-E38 Users Guide