33793 查看數據表（PDF） - Motorola => Freescale

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33793

DISTRIBUTED SYSTEM INTERFACE (DSI) SENSOR INTERFACE

Motorola => Freescale 

Freescale Semiconductor, Inc.

Set Logic Out Response

This response message is sent during the next message

following a valid Set Logic Out command to the addressed

device. The response is shown in Table 21. No response is

generated if the command address field was $0.

Table 21. Set Logic Out Response Format

High Byte

Low Byte

CRC

A3 A2 A1 A0 0 0 0 0 NV

U

LO BS IO3 IO2 IO1 IO0 X3 X2 X1 X0

Legend

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

BS = Bus Switch Position (1=closed)

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

LO = Logic out driven level.

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.

Reverse Initialization

The Reverse Initialization is similar to the Initialization

command and will only work under the condition that it has not

already been initialized. The command may be used three

ways. The first is to initialize a programmable address device.

The second is the first step in assigning a pre-programmed

address. The third is to initialize a pre-programmed device.

For the first case this command is sent to address zero with

the NV bit set to zero. The command will be received by the next

daisy chain device with its bus switch open. Reception of this

command will assign the device address and the group number.

Reception of this command will also cause the bus switch to

close if BS = 1 and no fault is detected.

For the second case the Initialization command is sent the

same as the first except that the NV bit is set to one. Reception

of the command will assign the device address and the group

number and cause the bus switch to close if BS = 1 and there

are no faults. A Read/Write NVM command then may be sent to

complete the setting of a pre-programmed address.

A pre-programmed device must be initialized by putting its

address in both PA3:PA0 and A3:A0 fields.

Once a device has received a reverse initialization

command, it will ignore further reverse initialization commands

or initialization commands unless it has received a Clear

command or undergone a power-up reset.

The command format is found in Table 22.

Table 22. Reverse Initialization Command Format

Data

Address

NV BS G1 G0 PA3 PA2 PA1 PA0 A3 A2 A1 A0

Command

1111

CRC

X3 X2 X1 X0

Legend

A[3:0] = Address bits. These bits are the slave address. For

programmable devices these bits are all set to zero. For pre-

programmed devices these bits contain the pre-programmed

address and must match the PA[3:0] bits.

G[1:0] = Group bits. These bits are the group number for the

slave. These bits are not used by this device and should be

set to “0”.

PA[3:0] = Program Address bits. These bits are the address

that is to be stored into the slave’s address register.

NV = Nonvolatile Memory Write. When set to a one, this bit allows a

subsequent NVM command to store a nonvolatile address. When

set to a zero, NVM programming is disallowed. Once a permanent

address has been stored in the device, setting the NV bit to a one

has no effect.

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

by the master.

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