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KTD-N0876-0
7.6 SPI Connector (J21)
The KTA75 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 SPI
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
and the ISOLATE# signal controls the output enable pin. For normal
operation this signal should be high.
Header
Pin
1
2
3
4
5
6
1
7
8
9
10
Signal
Further description
3.3V Standby Voltage power line. Normally output power, but
SB3V3
when Motherboard is turned 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 loading SPI flash.
ISOLATE#
the Motherboard must be turned off when loading SPI flash.
The pull up resistor is connected via diode to 5VSB.
Page 35
TM
flash coexists on the same interface lines. You
lines are protected with an additional bus driver
Signal
SPI_CLK
3.3V
SPI_CS#
SPI slave select, active low
ADDIN
Disable onboard SPI flash
RSVD
Reserved (10k pullup to 3.3V)
N.C.
SPI_MOSI SPI master output, Slave Input IO-3.3
ISOLATE#
Disable the SPI interface
SPI_MISO SPI master input, Slave Output IO-3.3
GND
KTA75/Flex Users Guide
KTA75/Flex Users Guide
Connector Signal Definition
Description
SPI clock
Power +3.3V
Not connected
Ground
Type
O-3.3
PWR
O-3.3
I-3.3
PWR
NC
I-3.3
PWR
Power Supply to
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