SPI made Simple

The SPI Bus (Serial Peripheral Interface) is based on simple shift registers. A detailed description by Martin Schwerdtfeger (MCT GmbH) is available in English www.mct.net/faq/spi.html and in German www.mct.de/faq/spi.html.

SPI made Simple is a modular concept, using the SPI bus to connect various functional blocks. Actually, SPImS is nothing else but the definition of a connector:

Pin	Function	Function	Pin
1 3 5 7 9 11 13	MOSI MISO CLK CS0 CS1 CS2 CS3	GND GND GND 5 Volt 5 Volt nc IRQ	2 4 6 8 10 12 14

Abbreviations:

MOSI Master Out Slave In
MISO Master In Slave Out
CLK Clock for the shift registers
CS0-CS3 Chip Select
nc free for application-specific use
5 Volt supply voltage (5 Volt DC, stable)
IRQ Interrupt ReQuest

A 14-pin connector with 2.54mm spacing is used. The boards are connected via flat ribbon cables. Wiring MOSI - GND - MISO - GND - CLK - GND etc. guarantees a defined impedance and prevents cross talk.

Currently available products:

Single board computer NET7026
Single board computer NET2106
Base board ULCbaseA
Base board BASE2
Motion controller BRIDGE1
Relay board RELAIS8
128x64 pixel LCD LCD1
Seven-segment display LED7

More boards will follow!

www.mct.net