ST75C540 datasheet(50/84 Pages) STMICROELECTRONICS

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Transmit

SCR1

Data

T10

T11 min

STA_H

P1s

PNs

PRs

SCR1s

Receive

T13

STA_HR

STA_109F

PRDETs

PNSUCs

STA_109

RxData

PNs

PNDETs

(3)

P2s

T12

(3)

(6)

Mode

T10

T11

T12

T13

Unit

V.17

V.17 short

V.29

V.29 short

V.27 4800

V.27 4800 short

V.27 2400

V.27 2400 short

Notes : 1.

In the case of V.29 or V.27, PRs and PRDETs bits are not active.

PNSUCs indicates the quality of the Rx signal that will give a ber of approximation of 1e

-5.

After sending the command SYNC0, all bits are reset.

When using long echo protection tone, otherwise 0.

When using short echo protection tone, otherwise 0.

STA-106 is set at the end of T6 and reset at the beginning of T10.

After sending the command SYNC1, this bit is set.

PNSUC is evaluated twice, first at SCR1 detection and further 256 baud (V.29, V.17, V.33 : 106ms ; V .27 4800bps : 160ms ;

V.27 2400bps : 212ms) after STA_109.

For V.21 channel 2, timing for loss of STA_109 is 25ms and timing for detection of STA_109 is 7ms.

10.

For V.21 channel 2 after a STOP command, STA_H is set to “1” during 13ms when the last HDLC flag is transmitted.

VIII - STATUS DESCRIPTION (continued)

ST75C530 - ST75C540

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