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AN1816

USING THE HC912B32 TO IMPLEMENT THE DISTRIBUTED SYSTEMS INTERFACE (DSI) PROTOCOL

Freescale Semiconductor 

Freescale Semiconductor, Inc.

HARDWARE DESIGN

An advantage of having programmable devices present in the system is

that they may be replaced and/or the system may be reconfigured by

adding nodes to the bus and the system will automatically reconfigure

itself at the next power up.

Pre-programmed

Devices

Slaves with pre-programmed addresses do not require a bus switch. On

power-up the stored pre-programmed address becomes the slave

address. However, pre-programmed devices must still receive an

Initialisation Command and reply with an Initialisation Response before

responding to any other bus commands.

HARDWARE DESIGN

Master Board

HC912B32 MCU

PWM pin

SPI

(master)

SCK

MOSI

MISO

I/O PIN

MC68HC55 SPI Peripheral

SCLK

CLK

DI

DO

CS*

CH.0

CH.1

MC33790 Bus Transceiver

DSI0F

DSI0S

DSI0R

DSI0O

GND

TWO-WIRE BUS

DSI1F

DSI1S

DSI1R

DSI1O

GND

Return

Signal

G

N

D

B

U

B

U

S

S

I

O

N

U

T

Slav

AN1816

Figure 8 Top Level DSI System Connections

Several ICs are used in the development of the system :

• Master board

– HC912B32

– MC68HC55 SPI Peripheral

– MC33790 Bus Transceiver

• Slave board

– evaluation slave device, the BEM IC

For More Information On This Product,

7

Go to: www.freescale.com

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