Spi Connector (J21) - Kontron KTA70M/mITX User Manual

KTD-N0861-B
7.6

SPI Connector (J21)

The KTA70 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
Signal Further description
3.3V Standby Voltage power line. Normally output power, but when Motherboard is turned
SB3V3
off then the on-board SPI Flash can be 3.3V power sourced via this pin.
The ISOLATE# input, active low, is normally NC, but must be connected to GND when
ISOLATE# loading 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.
Page 29
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.
1
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
KTA70M/mITX Users Guide
KTA70M/mITX Users Guide
Description
SPI clock O-3.3
Power +3.3V
O-3.3
I-3.3
Not connected
I-3.3
Ground
Pin Connectors
Type
PWR
PWR
NC
PWR