Specifications

Si2457/Si2434/Si2415

62 Rev. 0.91

Reset settings = 0x0000

U87 SAM

Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

Name MINT SERM FSMS XMTT

Type R/W R/W R/W R/W

Bit Name Function

15:11 Reserved Reads returns to zero.

10 MINT Minimal Transparency

0 = Generates two-byte transparency sequences. This option will use codes

<T5> through <T20>, if possible, for received data containing two back-to-back

bytes requiring transparency.

1 = Generates one-byte transparency sequences. This option will only use codes

<T1> through <T4> for received data.

9 SERM Special Error Reporting Mode

0 = Ignore unrecognized in-band commands.

1 = Generate <0x45> (“E” for error) in response to any unrecognized in-band com-

mands.

8FSMSFramed Sub-Mode Startup

0 = Upon successful connection, enter Transport Sub-Mode. An <FLAG> is

required to enter Framed Sub-Mode.

1 = Upon successful connection, immediately enter Framed Sub-Mode. The first

received <err> from a successful hunt is transformed into an <flag>.

7:0 XMTT Transmitter Threshold

This value represents the number of bytes before a transmission is started.

The following values are special:

0 The same as ten. Upon receipt of ten bytes, data is transferred. The DTE must supply

a closing flag within the required time or an underrun will occur.

255 The same as infinity, e.g. never start a packet until the closing flag is received.

UAA V.29 Mode

BitD15D14D13D12D11D10D9D8D7D6D5D4D3D2 D1 D0

Name V29ENA

Type R/W

Bit Name Function

15:2 Reserved Reads returns to zero.

1V29ENA0 = Disables V.29.

1 = Enables V.29.

0 Reserved Read returns zero.