CMX867A データシートの表示（PDF） - CML Microsystems Plc

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CMX867A

V.22 Full Duplex Call Set-Up on the CMX867

CML Microsystems Plc 

Answering

Modem

(2)

N

Scrambled

1s in low band

for 270ms?

Y

Error

Check that scrambled 1s are detected for 270ms (nom.)

If not then an error has occured.

Enable Rx USART

Transmit scrambled

1s

Load Tx buffer with

first data byte

Enable Rx USART

NOTE The use of the autoequaliser can improve performance.

Rx Mode ($E2)

b8 = user defined (autoequaliser setting)

b5..b3 = user defined (Rx USART mode)

b2..b0 = user defined (data bits and parity settings)

General Control ($E0)

b0 = 1 (unmask Rx Data Overflow & Rx Data Ready IRQ)

b1 = 0 (mask scrambled 1s IRQ)

Transmit scrambled 1s (for 765ms)

Tx mode ($E1)

b6,b5 = 11 (scrambler enabled)

Load Tx Data register ($E3 or $E4) with first byte

Note:- Check that Status ($E6) bit 12 = 1 (Tx Data Ready) before

loading the data.

Wait 765ms

Wait 765ms

Start data

transmision

Start data transmission

Tx Mode ($E1)

b4,b3 = user defined (Tx USART settings)

b2..b0 = user defined (data and stop bit settings)

General Control ($E0)

b3 = 1(Unmask TX Data Underflow and Tx Data Ready IRQ)

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