33793 datasheet(21/27 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33793

FUNCTIONAL DEVICE OPERATION

DSI COMMANDS AND RESPONSES

REVERSE INITIALIZATION RESPONSE

This response message is sent during the next message

following a valid Reverse Initialization command to the

addressed device. The response is shown in Table 28. Since

this is a long-word only command, the short-word response is

invalid. No response is generated if the command address

field was $0.

Table 27. Reverse Initialization Command Format

Data

Address

Command

CRC

PA3

PA2

PA1

PA0

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.

Table 28. Reverse Initialization Response Format

High Byte

Low Byte

CRC

PA3 PA2 PA1 PA0

Legend

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

BF = Bus Fault. BUSIN short to battery detected.

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

G[1:0] = Group bits. Not used on this part, will be set to “0”. The

group number programmed into the slave.

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

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

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

slave.

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