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KTD-N0903-A
SPI Connector (SPI – J16)
7.14
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:
TM
1.
An onboard SPI
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).
TM
2.
The four SPI
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
Description
SPI_CLK
Serial Clock
3.3V Standby Voltage power line. Normally output power, but when Motherboard is
3.3V
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.
The ISOLATE# input, active low, is normally NC, but must be connected to GND when
ISOLATE#
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.
Page 36
Pin
Signal
1
SPI_CLK
2
3.3V
3
SPI_CS#
SPI slave select, active low
4
ADDIN
Disable onboard SPI flash
5
RSVD
Reserved (10k pullup to 3.3V)
6
N.C.
7
SPI_MOSI SPI master output, Slave Input IO-3.3
8
ISOLATE#
Disable the SPI interface
9
SPI_MISO SPI master input, Slave Output IO-3.3
10
GND
mITX-E38 Users Guide
Description
SPI clock
O-3.3
Power +3.3V
O-3.3
I-3.3
Not connected
I-3.3
Ground
Internal Connectors
Type
PWR
PWR
NC
PWR
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