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.

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 27. Reverse Initialization Command Format

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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