SI2456 datasheet(54/86 Pages) SILABS

Part #	SI2456

Description	V.90, V.34, V.32BIS ISOMODEM??WITH INTEGRATED GLOBAL DAA

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Manufacturer	SILABS [Silicon Laboratories]

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54 / 86 page

Si2456/Si2433/Si2414

54

Rev. 0.9

Reset settings = 0x0000

U69 ITC3

Bit

D15 D14 D13 D12 D11 D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

Name

DIAL

FJM

VOL

FLVM MODE

Type

R/W

Bit

Name

Function

15:8

Reserved Read returns zero.

7

Reserved Do not modify. Must be set to zero.

6DIAL

DTMF Dialing Mode.

This bit should be set during DTMF dialing in CTR21 mode if LVCS < 12.

0 = Normal operation.

1 = Increase headroom for DTMF dialing.

5FJM

Force Japan DC Termination Mode.

0 = Normal Gain.

1 = When DCT = 2 (FCC mode), setting this bit forces Japan dc termination mode while allow-

ing for a transmit level of –1 dBm. See "DTMF Dialing" on page 69.

4VOL1,2

Line Voltage Adjust.

When set, this bit adjusts the TIP-RING line voltage. Lowering this voltage improves margin in

low voltage countries. Raising this voltage may improve large signal distortion performance.

0 = Normal operation.

1 = Lower DCT voltage.

3FLVM1,2

Force Low Voltage Mode.

When DCT (U67, bits 3:2) = 10 (FCC mode), setting FLVM forces the Low Voltage mode (see

DCT = 00) while allowing for a transmit level of –1 dBm.

0 = Disable.

1 = Enable.

2MODE

Mode.

MODE = 1b enables on-hook line monitor. MODE must be disabled (MODE = 0b) before the

modem can go off-hook, dial, or answer a call.

0 = Disable.

1 = Enable.

1:0

Reserved Do not modify.

Notes:

1. See Table 19 on page 39

2. See "Appendix A—DAA Operation" on page 67

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