ST75C520PQFP datasheet(24/45 Pages) STMICROELECTRONICS

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SYNC

FAX Synchronize the Receiver

SYNC

Opcode:

00100110

Synopsis

SYNC is used, in FAX Modes, to force the ST75C520 to Start/Stop the receiver in

accordance with the corresponding ITU-T V.33/V.17/V.29/V.27recommendation.As soon

as the ST75C520 receives the SYNC Start command it sets its receiver to detect the FAX

synchronization signal.This command is the equivalent HSHK command for the receiver.

Parameters

Field

Byte

Pos.

Value

Definition

RX_SYNC

Stop receiver

Start receiver synchronization

TDRC

Tone Detector Read Coefficient

TDRC

Opcode:

00011010

Synopsis

TDRC Read one Coefficient of the selected Tone Detector Cell.

Parameters

Field

Byte

Pos.

Value

Definition

TD_CELL

3..0

0..F

Tone detector cell number

TD_C_ADDR

7..0

0..B

Other

Biquad coefficient

Energy coefficient

Static level

Reserved

The command answer is : Low Byte of Coefficient followed by High Byte of Coefficient.

TDRW

Tone Detector Read Wiring

TDRW

Opcode:

00011011

Synopsis

TDRC Read Wiring of the selected Tone Detector Cell.

Parameters

Field

Byte

Pos.

Value

Definition

TD_CELL

3..0

0..F

Tone detector cell number

TD_W_ADDR

Other

Biquad and energy input

Comparator inputs

Reserved

The command answer is:

a) If TD_W_ADDR = 0 :

- First Byte is the Node Number of the Signal connected to Biquadratic Filter input.

- Second Byte is the Node Number of the Signal connected to the Energy estimator input.

b) if TD_W_ADDR = 1 :

- First Byte is the Node Number of the Signal connected to Comparator Negative input.

- Second Byte is the Node Number of the Signal connectedto the Comparator Positive input.

ST75C520

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