ST75C540 datasheet(51/84 Pages) STMICROELECTRONICS

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VIII.2.5.3 - Default Optional Status in DATA MODEM Mode (ST75C540 only)

While in Data Modem mode the format of the STAOP word is as follows :

Optional Status Words in MODEM Mode

Add.

Name

Bit

543

$0C

STAOP0

SPEED

(2)(5)

SPVAL

(1)(5)

$0D

STAOP1

STAQUAS

$0E

STAOP2

HSHK_PHA

$0F

STAOP3

TDT19

TDT18

TDT17

TDT16

Not Used

Notes : 1. SPVALis active in V.33 receiver only at the same time as the rising transition of the SCR1s signal. When SPVAL is set, it

indicates that the SPEED bits contain the Data speed information.

2. SPEED is valid in V.32bis, V.32, V.22bis, V.22, Bell 212A and V.33 receiver only with the following meaning :

Bit 4

Bit 3

Bit 2

Bit 1

Data Speed

1200bps

2400bps

4800bps

7200bps

9600bps

12000bps

14400bps

Other

Reserved

3. The STAOP2 Bit reflects the progression of the Synchronisation.

4. Only valid in V.21 Channel 2 Receive mode.

5. SPVALis active in V.32bis/V.32/V.22bis/V.22 at the end of the training sequence and at least 8 baud before entering Data mode.

SPVALand SPEED are also updated with each retrain and rate negotiation.

6. The SPAOP1 bits reflect the progression of the synchronization in Data modes.

VIII - STATUS DESCRIPTION (continued)

ST75C530 - ST75C540

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