33793 datasheet(12/27 Pages) FREESCALE

12 / 27 page

Analog Integrated Circuit Device Data

Freescale Semiconductor

33793

FUNCTIONAL DESCRIPTION

FUNCTIONAL INTERNAL BLOCK DESCRIPTION

• Read the general purpose I/O logic values and respond

to request for these values.

• Generating a cycle redundancy check (CRC) for the

received data and transmitted data in conformance with

the DSI Bus Standard.

Additionally, the control logic performs error checking on

the received data. If errors are found, no action is taken and

no response is made. Errors include:

• CRC received doesn’t match CRC of received data.

• Number of received bits is not 12 or 20.

CLOCK

The clock is a low-stability type with the capacitor

integrated onto the die. The signaling system and all internal

operations are such that no external precision timing device

is needed in the normal operation of this device.

BUS SWITCH (BUSSW)

The bus switch passes signaling and power to all

subsequent devices on the bus. It can block a voltage of

either polarity up to the highest idle state level between

BUSIN and BUSOUT.

LOGICOUT

LOGICOUT is a logic level output with enhanced high-side

drive capability.

ADDRESSING

The 33793 IC supports both runtime programmable and

pre-programmed addressing as defined in the DSI

Specification. Runtime programmable addressing uses the

daisy chain bus connection. Pre-programmed devices may

either be connected in daisy chain or in parallel on the bus

wires.

Programmable address devices all power up with a device

address of $0 in their address register and their bus switches

open. In the daisy chain, if the first device receives the

initialization command device on BUSIN, it will accept the

address in the command and close its switch at the end of the

command. The next device in the chain will now be able to

receive the initialization command on its BUSIN and will

accept the next address. This proceeds down the chain until

the last device is addressed. The devices can also be

initialized by the reverse initialization command if the signal is

applied to BUSOUT.

Pre-programmed devices power up with their pre-

programmed address in its address register. It will ignore all

Initialization commands unless the address in the command

matches its pre-programmed address. In this event the

device stores the other information contained in the

Initialization command.

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