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33793

DISTRIBUTED SYSTEM INTERFACE (DSI) SENSOR INTERFACE

Motorola => Freescale 

Freescale Semiconductor, Inc.

OPERATION

A device may be permanently programmed one time with an

address using a two-command sequence. The first step is

satisfied on the reception of an Initialization command with

address set to zero, the PA[3:0] set to the address to be

programmed, and the NV bit set. This will cause the address

contained in the PA[3:0] bits to be stored in the address register

and the bus switch closed. The second step is taken when a

Read/Write NVM command is received with the PA[3:0] bits

matching the A[3:0] bits and also matching the bits stored in the

33793 address register. This will cause the 33793 to

permanently store this address into an internal NVM area.

Messages

The messages follow the format defined in the Distributed

Systems Interface Specification rev 1.0 unless otherwise noted.

DSI Bus Commands

This device can recognize and respond to both long-word

and short-word commands. A command word summary is

shown in Table 1. SW in the “Size” column of the table indicates

short-word commands and LW indicates long-word commands.

Short-word commands may also be sent in the long-word

format. However, when these commands are sent in the long-

word format, it is recommended that the data byte be sent as

$00 to maintain future compatibility. All commands marked

reserved should not be sent to 33793 slaves.

Table 1. DSI Bus Commands

Command

C3 C2 C1 C0

Size

Description

Data

D7 D6 D5 D4 D3

D2

D1

D0

0

0

00

LW Initialization

NV BS G1 G0 PA3 PA2 PA1 PA0

0

0

01

SW Request Status

–

–

–

–

–

–

–

–

0

0

10

SW Request Value 0

–

–

–

–

–

–

–

–

0

0

11

LW I/O Control

L3 L2 L1 L0 DR3 DR2 DR1 DR0

0

1

00

SW Request ID Information

–

–

–

–

–

–

–

–

0

1

01

SW Request Value 1

–

–

–

–

–

–

–

–

0

1

10

SW Request Value 2

–

–

–

–

–

–

–

–

0

1

11

SW Clear

–

–

–

–

–

–

–

–

1

0

00

SW Request Value 3

–

–

–

–

–

–

–

–

1

0

01

LW Read/Write NVM

1

1

1

1

PA3 PA2

PA1 PA0

1 0 10

Reserved

1 0 11

Reserved

1

1

00

SW Clear Logic Out

–

–

–

–

–

–

–

–

1

1

01

SW Set Logic Out

–

–

–

–

–

–

–

–

1 1 10

Reserved

1

1

11

LW Reverse Initialization

NV BS G1 G0 PA3 PA2 PA1 PA0

Legend

BS = Controls closing of the Bus Switch (1 = close).

DR[3:0] = Direction of I/O. 1 = Output.

G[1:0] = Group assignment (the 33793 does not use these bits).

L[3:0] = Level to output on I/O if configured as outputs.

LO = Logic Out level.

PA[3:0] = Bus Address to set the device to.

NV = Allows nonvolatile address programming if set to "1".

33793

12

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