SI2493-C-FT Silicon Laboratories Inc, SI2493-C-FT Datasheet - Page 96

• Manufacturer Part Number: SI2493-C-FT
• Description: 56 KBPS, V.92 ISOMODEM SYSTEM-SIDE - LEAD-FREE TSSOP 0 TO 7
• Manufacturer: Silicon Laboratories Inc

Specifications of SI2493-C-FT

• Mfg Application Notes: SI2493/57/34/15/04, Appl Note AN93
• Data Format: V.21, V.22, V.23, V.29, V.32, V.34, V.90, V.92, Bell 103, Bell 212A
• Baud Rates: 56k
• Interface: Parallel
• Voltage - Supply: 3 V ~ 3.6 V
• Mounting Type: Surface Mount
• Package / Case: 24-TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AN93
3.3.46. U7D (GEND)
U7D is a bit-mapped register with bits 15,13:9, and bits
8:2 reserved. U7D resets to 0x0000 with a power-on or
manual reset.
Bit 14 (NLM) = 0 (default) causes the modem to
automatically detect loop current absence or loss. When
bit 14 = 1b, this feature is disabled.
Bit 12 (TCAL) = 0 (default) when set to 1 forces the DAA
to calibrate at a programmable time after going off-hook.
The time between going off-hook and the start of
calibration is programmed with U54[15:8] in 32 ms
units.
96
15:5
10:2
Bit
3:1
Bit
15
14
13
12
11
4
0
1
0
RIGPOEN 0 = RI (Si2493/57/34/15/04 pin 15) indicates valid ring signal.
Reserved Read returns zero.
Reserved Read returns zero.
Reserved Read returns zero.
Reserved Read returns zero.
Reserved Read returns zero.
RIGPO
Name
Name
CALD
TCAL
ATZD
NLM
FDP
RI (Si2493/57/34/15/04 pin 15).
Follow this bit when U7C[0] (RIGPIOEN) = 1
1 = RI (Si2493/57/34/15/04 Pin 15) follows U7C[4] (RIGPO).
0 = Enables “No Loop Current” Detect.
1 = Disables “No Loop Current” Detect.
0 = Timed calibration disabled.
1 = Timed calibration. The time between off-hook and calibration is set in U54 (OHCT).
0 = No calibration during dial.
1 = Calibrate during dial. It is recommended that the dial string start with “,” to prevent first
digit loss.
0 = ATZ enabled.
1 = ATZ disabled.
0 = FSK data processing stops when carrier is lost.
1 = FSK data processing continues for two bytes after carrier is lost.
Table 67. U7C Bit Map
Table 68. U7D Bit Map
Rev. 0.9
Bit 11 (OHCT) = 0 (default) when set to 1 forces the
DAA to calibrate at the start of dialing. The first dial
character should be a delay (“,”) to prevent interference
with the first digit.
Bit 1 (ATZD) = 0 (default) allows the ATZ command to
be active. When Bit 1 = 1b, the ATZ command is
disabled.
Bit 0 (FDP) = 0 (default). FSK data processing stops
when the carrier is lost. Unprocessed data is lost.
Setting Bit 0 = 1 causes FSK data processing to
continue for up to two bytes of data in the pipeline after
carrier is lost.
Function
Function
b
.