ST75C540 datasheet(30/84 Pages) STMICROELECTRONICS

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Parameters When the CONF_OPER is set to F, selecting the Modem Mode of operation, the parameters

have the following meaning :

Field

Byte

Pos.

Value

Definition

CONF_OPER

3..0

1111

Select Modem Mode

CONF_ANAL

Normal mode

Analog loop back (test mode only)

CONF_PSTN

PSTN (carrier detect set to -43/-48dBm)

Leased line (carrier detect -33/-38dBm)

CONF_AO

Answer mode

Originate mode

CONF_DTINIT

(only in tone mode)

170

Global init of secondary tone detector

Partial init of secondary tone detector

(8)

CONF_MODE

5..0

Other

Automode (V.32bis/V.32/V.22bis/V.22)

(9)

Bell 103 (full duplex)

Bell 212A (full duplex)

(9)

V.21 (full duplex)

V.23 (full duplex)

V.22 (full duplex)

(9)

V.22bis (full duplex)

(9)

V.27ter

V.29

V.17

V.32 (full duplex)

(9)

V.32bis (full duplex)

(9)

V.33 (half duplex)

V.21 channel 2

Reserved

CONF_TXEQ

7..6

No transmit equalizer

Transmit equalizer #1

Transmit equalizer #2

Transmit equalizer #3 (V.17/V.33/V.29/V.27ter)

CONF_CAR

1800Hz carrier (V.17/V.33 only)

1700Hz carrier (V.17/V.33 only)

CONF_TCM

Treillis coding not allowed (V.32 only)

Treillis coding allowed (V.32bis, V.32)

CONF_SP0

7..4

xxx1

xx1x

x1xx

1xxx

1200bps allowed (V.22, V.22bis)

(10)

2400bps allowed (V.22bis, V.27)

(10)

4800bps allowed (V.32bis, V.32, V.27, V.29)

(10)

7200bps allowed (V.32bis, V.29, V.17)

(10)

CONF_SP1

2..0

xx1

x1x

1xx

9600bps allowed (V.32bis, V.32, V.29, V.17)

(10)

12000bps allowed (V.32bis, V.17, V.33)

(10)

14400bps allowed (V.32bis, V.17, V.33)

(10)

Notes :

With conf 80 00 00 00 the coefficients of secondary tone detectors are not initialized.

ST75C540 only.

10.

V.22bis, V.22, V.32bis and V.32 modes ST75C540 only.

VII - COMMAND SET DESCRIPTION (continued)

ST75C530 - ST75C540

30/84

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