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SI2401

V.22BIS ISOMODEM® WITH LOW-COST DAA

Silicon Laboratories 

Si2401/Si3008

Table 11. V.22/Bell212 Handshaking Control Registers

Register Name

Function

S1E TATL Transmit Answer Tone Length

S1F ATTD Answer Tone to Transmit Delay

S20

UNL Unscrambled Ones Length—V.22

S21 TSOD Transmit Scrambled Ones Delay—V.22

S22 TSOL Transmit Scrambled Ones Length—V.22

S23 VDDL V.22/22b Data Delay Low

Units

1s

5/3 ms

5/3 ms

53.3 ms

5/3 ms

5/3 ms

Default Fast

Connect

0x03

00

0x2D

00

0x5D

00

0x09

00

0xA2

00

0xCB

00

S24 VDDH V.22/22b Data Delay High

S34 TASL Answer Tone Length

(only used in S1E [TATL] = 0x00)

S35 RSOL Receive V.22 Scrambled Ones Length

(256) 5/3 ms 0x08

00

5/3 ms

0x5A

F0

5/3 ms

0xA2

00

Rev. 1.1

19

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