CLRC63201TSLASH0FE datasheet(128/163 Pages) PHILIPS

128 / 163 page

Philips Semiconductors

Product Specification Rev. 3.0; May 2003

Multiple Protocol Contactless Reader IC

CL RC632

128

Confidential

18.5.2.4 Communication Errors

The following table shows which event causes the setting of error flags:

Cause

Bit, that is set

Received data did not start with a SOF pattern.

FramingErr

The CRC block is not equal the expected value.

CRCErr

The received data is shorter than the CRC block.

CRCErr

A collision is detected.

CollErr

Table 18-6: Communication Error Table

18.5.3 TRANSCEIVE COMMAND 1EHEX

Command

Codehex

Action

Arguments and Data

Returned Data

Transceive

Transmits data from FIFO buffer to the label

and then activates automatically the receiver

Data Stream

The Transceive-Command first executes the Transmit-Command (see 18.4.1) and then automatically starts

the Receive-Command (see 18.4.2). All data that shall be transmitted is forwarded via the FIFO buffer and all

data received is returned via the FIFO buffer. The Transceive-Command can be started only by the

µ-Processor.

Note: To adjust the timing relation between transmitting and receiving, the RxWait Register is used to define

the time delay from the last bit transmitted until the receiver is activated. Furthermore, the BitPhase Register

determines the phase-shift between the transmitter and the receiver clock.

18.5.4 STATES OF THE LABEL COMMUNICATION

The actual state of the transmitter and receiver state machine can be fetched from ModemState in the

PrimaryStatus Register.

The assignment of ModemState to the internal action is shown in the following table:

ModemState

Name of State

Description

000

Idle

Neither the transmitter nor the receiver is in operation,

since none of them is started or the transmitter has not got input data

001

TxSOF

Transmitting the ‘Start Of Frame’ Pattern

010

TxData

Transmitting data from the FIFO buffer (or redundancy check bits)

011

TxEOF

Transmitting the ‘End Of Frame’ Pattern

GoToRx1

Intermediate state passed, when receiver starts

100

GoToRx2

Intermediate state passed, when receiver finishes

101

PrepareRx

Waiting until the time period selected in the RxWait Register has expired

110

AwaitingRx

Receiver activated; Awaiting an input signal at pin Rx

111

Receiving

Receiving data

Table 18-7: Meaning of ModemState

18.5.5 STATE DIAGRAM FOR THE LABEL COMMUNICATION

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