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33793
(Rev.:2010)

Distributed System Interface (DSI) Sensor Interface

Freescale Semiconductor 

FUNCTIONAL DEVICE OPERATION

DSI COMMANDS AND RESPONSES

device address register on the next and all subsequent

power-ups. If the device is not blank, this command will return

the programmed value during the next message time.

Programming the NVM address to $0 is allowed. This

ensures that the device always acts as a dynamically

addressable device and would be immune to any inadvertent

future NVM programming sequences.

Reads and writes are long-word commands only. The

command format is found in Table 21.

Table 21. Read/Write NVM Command Format

Data

Address

Command

CRC

1 1 1 1 PA3 PA2 PA1 PA0 A3 A2 A1 A0 1 0 0 1 X3 X2 X1 X0

Legend

A[3:0] = Address bits. These bits are the address of the device PA[3:0] = Program Address bits. These bits are the address that is to be

previously sent with the Initialization command. They must match programmed into the slave.

the address in the PA[3:0] field and the address stored in the

device address register.

X[3:0] = Cyclic Redundancy Check (CRC). The CRC as calculated by the

master.

READ/WRITE NVM RESPONSE

This response message is sent during the next message

following a valid Read/Write NVM command to the addressed

device. The response format is found in Table 22. The high

byte is omitted during the short-word response. No response

is generated if the command address field was $0.

Table 22. Read/Write NVM Response Format

High Byte

A3 A2 A1 A0 0 0 0 0 1 1

Legend

A[3:0] = Address bits. The slave address.

PA[3:0] = Programmed Address bits. The address that was

programmed into the NVM address bits of the slave.

Low Byte

CRC

1 1 PA3 PA2 PA1 PA0 X3 X2 X1 X0

X[3:0] = Cyclic Redundancy Check (CRC). The CRC as calculated by the

slave.

CLEAR LOGIC OUT COMMAND

The Clear Logic Out command sets the Logic Out pin to a

logic low. The compliment to this command is the Set Logic

Out. The Logic Out is also cleared at power-up or following a

Clear command. The format of the Clear Logic Out command

is shown in Table 23.

Table 23. Clear Logic Out Command Format

Data

Address

Command

CRC

–

–

–

–

–

–

–

–- A3

Legend

A[3:0] = Address bits. The address of the selected device.

A2 A1 A0 1

1

0

0 X3 X2 X1 X0

X[3:0] = Cyclic Redundancy Check (CRC). The CRC as calculated by the

master.

CLEAR LOGIC OUT RESPONSE

This response message is sent during the next message

following a valid Clear Logic Out command to the addressed

device. The response is shown in Table 24. No response is

generated if the command address field was $0.

Table 24. Clear Logic Out Response Format

High Byte

Low Byte

CRC

A3 A2 A1 A0 0 0 0 0 NV

Legend

A[3:0] = Address bits. The slave address.

BS = Bus Switch Position (1=closed).

LO = Logic out driven level.

IO[3:0] = Values at logic I/Os.

U

LO BS IO3 IO2 IO1 IO0 X3 X2 X1 X0

NV = Nonvolatile Memory Write. The value of the NV bit in the slave.

U = Undervoltage indicated true by a “1”.

X[3:0] = Cyclic Redundancy Check (CRC). The CRC as calculated by the

slave.

Analog Integrated Circuit Device Data

Freescale Semiconductor

33793

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