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10 spi bus, Spi bus, Digital-logic ag – Compaq SmartCore Express SMA200 User Manual

Page 34

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DIGITAL-LOGIC AG

SMA200 Manual V1.0

34

5.4.10. SPI BUS

Signal

BUS

Type

Description

On Module
Termination

Ext. Ter-
mination
Needed

Max.
Length
in mm

Ohm

Matched
Length
in mm

SPI_MISO

CMOS

3.3V

In

Connect to the SPI
device.

-

150

55

-

SPI_MOSI

CMOS

3.3V

Out

Connect to the SPI
device.

150

55

-

SPI_CLK

CMOS

3.3V

Out

Connect to the SPI
device.
f = 17.86 and 31.25MHz

Series 33 Ohm

150

55

-

SPI_CS#

CMOS

3.3V

Out

Connect to the SPI
device.

150

55

-

If the signals are not used:

Remarks:

EMV/EMI filters:

Are not needed.