SI2493-C-FT Silicon Laboratories Inc, SI2493-C-FT Datasheet - Page 22

• 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
3.1. Controller
The controller provides several vital functions including
AT command parsing, DAA control, connect sequence
control, DCE (data communication equipment) protocol
control, intrusion detection, parallel phone off-hook
detection, escape control, caller ID control and
formatting, ring detect, DTMF (dual tone multi-
frequency) control, call progress monitoring, error
correction, and data compression. The controller also
writes to the control registers that configure the modem.
Virtually all interaction between the host and the modem
is done via the controller. The controller uses “AT”
(ATtention) commands, S-Registers, and U-Registers to
configure and control the modem.
3.1.1. Data Compression
The modem can achieve DTE (host-to-ISOmodem)
speeds greater than the maximum DCE (modem-to-
modem) speed through the use of a data compression
protocol. The compression protocols available are the
ITU-T V.44, V.42bis, and MNP5 protocols. Data
compression attempts to increase throughput by
compressing the information to be sent before actually
sending it. The modem is thus able to transmit more
data in a given period of time. Table 9 details the
Si2493/57/34/15/04
compression modes of operation.
22
CLKOUT
RESET
FSYNC
EECLK
D0-D7
MCLK
EESD
EECS
DCD
RXD
SDO
TXD
CTS
RTS
ESC
WR
INT
SDI
RD
CS
A0
RI
error
Figure 9. Si2493/57/34/15/04 Functional Block Diagram
correction
EEPROM
Interface
Interface/
Interface
Interface
Parallel
Si3000
UART
Serial
XTI
Clocking
PLL
and
ROM
RAM
XTO
data
Rev. 0.9
Data Bus
*Note: V.44 is available only on Si2493.
No data compression and
Table 9. Enabling Error Correction/Data
no error correction
MNP2-4 only
MNP2-5 only
V.42 (LAPM)
V.42bis only
To Enable
V.42 only
MNP2–4
V.42 and
V.42bis
MNP5
Interface
V.44*
Wire
DAA
Compression
C1
C2
AOUT
\N3 and %C1 (default)
Use AT Commands
+DS44 (argument)
To Phone
Line
\N4 and %C0
\N4 and %C1
\N2 and %C0
\N2 and %C1
\N0 and %C0