33793 datasheet(18/27 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33793

FUNCTIONAL DEVICE OPERATION

DSI COMMANDS AND RESPONSES

REQUEST ID COMMAND

This command will cause the device ID information to be

read from internal storage and returned to the master during

the response to the next message. The command format is

found in Table 18.

REQUEST ID RESPONSE

This response message is sent during the next message

following a valid long-word Request ID command to the

addressed device. The response format is found in Table 19.

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

response is generated if the command address field was $0.

CLEAR COMMAND

This command will open the bus switch and reset all

registers to the reset state. The command format is found in

Table 20. No response is generated for the Clear command.

READ/WRITE NVM COMMAND

If the NV bit has been set by a previous Initialization

command and the NVM has not been programmed

previously, this command will permanently program the

device’s one-time programmable address and return the

programmed value during the next message time. Once

programmed, this nonvolatile address is used to set the

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

DR3

DR2

DR1

DR0

Legend

A[3:0] = Address bits.

DR[3:0] = I/O enabled as outputs (1 = enabled as output).

L[3:0] = Programmed values.

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

slave.

Table 17. I/O Control Response Format

Table 18. Request ID Command Format

Data

Address

Command

CRC

–

Legend

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

address value of “0000” is ignored by all devices.

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

master.

Table 19. Request ID Response Format

Address

Status

Data

CRC

Legend

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

V[2:0] = Device version number. The silicon version number of the

device. For this device the device type is 00011 as indicated by the

lowest bits.

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

slave.

Table 20. Clear Command Format

Data

Address

Command

CRC

–

Legend

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

address value of “0000” clears all devices.

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

master.

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