SI3015-F-FS View Datasheet(PDF) - Silicon Laboratories

Part Name

Description

Manufacturer

SI3015-F-FS

V.22BIS ISOMODEM® CHIPSET WITH ERROR CORRECTION

Silicon Laboratories 

Si2403

6. User-Access Registers (U-Registers)

The :U AT command is used to write these 16-bit U-registers, and the :R command is used to read them. U-

registers are identified by a hexidecimal (hex) address.

Table 14. U-Register Descriptions

Register Name Description

U00 DT1A0 DT1 registers set the coefficients for stage 1 of the Dial Tone Detect filter.

Default is for FCC countries. See “AN70: Si2456/Si2433/Si2414/Si2403

U01

DT1B1 Modem Designer’s Guide” for other country settings.

U02 DT1B2

U03 DT1A2

U04 DT1A1

U05 DT2A0 Dial tone detect filters stage 2 biquad coefficients.

U06 DT2B1

U07 DT2B2

U08 DT2A2

U09 DT2A1

U0A DT3A0 Dial tone detect filters stage 3 biquad coefficients.

U0B DT3B1

U0C DT3B2

U0D DT3A2

U0E DT3A1

U0F DT4A0 Dial tone detect filters stage 4 biquad coefficients.

U10 DT4B1

U11

DT4B2

U12 DT4A2

U13 DT4A1

U14

DTK Dial tone detect filter output scaler.

U15

DTON Dial tone detect ON threshold.

U16

DTOF Dial tone detect OFF threshold.

Default

0x0800

0x0000

0x0000

0x0000

0x0000

0x00A0

0x6EF1

0xC4F4

0xC000

0x0000

0x00A0

0x78B0

0xC305

0x4000

0xB50A

0x0400

0x70D2

0xC830

0x4000

0x80E2

0x0009

0x00A0

0x0070

Rev. 1.2

35

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