SI3066 Просмотр технического описания (PDF) - Silicon Laboratories

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SI3066

V.32 FCC+ EMBEDDED DIRECT ACCESS ARRANGEMENT

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Si3066

DAA Register 1. Control 1

Bit

D7

D6

Name

SR

Type

R/W

Reset settings = 0000_0x0x

D5

D4

D3

D2

D1

D0

PWMM[1:0]

PWME

IDL

R/W

R/W

R/W

Bit

Name

Function

7

SR

Software Reset.

0 = Enables DAA for normal operation.

1 = Sets all registers to their reset value.

Note: Bit clears automatically after being set.

6

Reserved Always write as zero. Reads undefined.

5:4 PWMM[1:0] Pulse-Width Modulation Mode.

Selects the type of signal on the call progress AOUT pin.

00 = PWM output clocked at 16.384 MHz. A local density of 1s and 0s tracks the com-

bined transmit and receive signal.

01 = Balanced conventional PWM output signal has high and low portions of the modu-

lated pulse centered on the 32 kHz sample clock.

10 = Conventionally PWM output signal returns to 0 at 32 kHz intervals and rises at a

time in the 32 kHz period proportional to the instantaneous amplitude.

11 = Reserved.

3

PWME Pulse-Width Modulation Enable.

0 = Call progress PWM AOUT disabled.

1 = Call progress PWM AOUT enabled.

2

Reserved Read returns zero.

1

IDL

Isolation Digital Loopback.

0 = Digital loopback across isolation barrier disabled.

1 = Enables digital loopback mode across isolation barrier. The line-side device must be

enabled and off-hook before setting this mode. This data path includes RX and TX filters.

A valid phone line is not necessary for this mode.

0

Reserved Read returns zero.

18

Rev. 1.0

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