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

部品番号

コンポーネント説明

一致するリスト

CMX867A

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

CML Microsystems Plc 

Answering

Modem

Power Up on Ring

qualification

Wait 20ms

Initialise Registers

Take Off-Hook

V.25

Wait 2150ms

Transmit

Answertone

Wait 3300ms

Turn off

Answertone

Wait 75ms

Transmit

unscrambled 1s

N

Scrambled

1s detected in low

band?

Y

CONTINUED

Figure 3

On Ring Interrupt

A ring interrupt should wake the host controller to perform

a ring qualification routine and power up the CMX868.

Power up

General Control ($E0)

b8 = 1(Device powered normally)

b7 = 1(Reset internal circuitry)

Wait 20ms

Initialise Registers

General Control ($E0)

b7 = 0 (Normal operation)

Tx Mode ($E1)

b15..12 = 0001 (select DTMF/Tones mode)

b11..9 = user defined (Tx level)

Rx Mode ($E2)

b15..12 = 1100 (select V.22 low band)

b11..9 = user defined (Rx level)

b7,b6 = 11 (descrambler enabled)

Take Off-Hook

General Control ($E0)

b9 = 1 (Relay drive pin pulled to Vss)

Wait for 2150ms.

Transmit Answertone

Tx Mode ($E1)

b3..0 = 1010 (2100Hz Answertone)

or b3..0 = 1011 (2225Hz Answertone)

Wait for 3300ms

Turn off Answertone

Tx Mode ($E1)

b3..0 = 0000 (No Tone)

Wait for 75ms

Transmit Unscrambled 1s

Tx Mode ($E1)

b15..12 = 1101 (select V.22 high band)

b8,b7 = user defined (Tx guard tone)

b4,b3 = 11 (select synchronous mode)

b2..b0 = 011 (select continuous 1s)

Detect scrambled 1s

General Control ($E0)

b1 = 1 (unmask scrambled 1s detect IRQ)

On interrupt, check Status ($E6)

If b10 = 1 (Rx energy detected)

b8,b7 = 11 (scrambled 1s found)

Share Link: