si2401 Silicon Laboratories, si2401 Datasheet - Page 32

• Manufacturer Part Number: si2401
• Description: V.22bis Isomodem With Integrated Global Daa
• Manufacturer: Silicon Laboratories

Si2401
32
DSP Reg. Addr.
0x000A
0x000B
0x000E
0x0002
0x0003
0x0004
0x0005
0x0006
0x0007
0x0008
0x0009
0x0024
0x0025
0x0026
0x0027
UDFD1 User-defined frequency detector 1. Center
UDFD2 User-defined frequency detector 2. Center
UDFD3 User-defined frequency detector 3. Center
UDFD4 User-defined frequency detector 4. Center
UDFSL Sensitivity setting for UDFD1–4 detectors,
UFRQ User-defined transmit tone frequency. See
Name
DTML DTMF high-tone transmit level,
DTMT DTMF twist ratio (low/high),
CONL Carrier ON level. Carrier is valid once it
AONL Answer ON level. Answer tone is valid
XMTL DAA modem full-scale transmit level,
CPDL Call progress detect level (see Figure 5),
TGNL Tone generation level associated with
COFL Carrier OFF level. Carrier is invalid once it
AOFL Answer OFF level. Answer tone is invalid
default = –10 dBm.
default = –5.5 dBm.
default = –2 dBm.
register SE5 (SE8=0x02 (Write Only)).
default = –43 dBm.
frequency for detector 1.
frequency for detector 2.
frequency for detector 3.
frequency for detector 4.
TONC (SE5 (SE8 = 0x02) Write Only Defi-
nition), default = –10 dBm.
default = –43 dBm.
reaches this level.
falls below this level.
once it reaches this level.
once it falls below this level.
Table 18. Low-Level DSP Parameters
Description
Rev. 1.0
Level = 20log
–10 dBm
Level = 20log
–5.5 dBm
Level = 20log
2 dB
f = (9600/512) UFRQ (Hz)
Level = 20log
–43 dBm
UDFD1 = 8192 cos (2 π f/9600)
UDFD2 = 8192 cos (2 π f/9600)
UDFD3 = 8192 cos (2 π f/9600)
UDFD4 = 8192 cos (2 π f/9600)
Level = 20log
– 10 dBm
Sensitivity = 10log
4096) –43 dBm
Level = 20log
43 dBm
Level = 20log
45.5 dBm
Level = 10log
43 dBm
Level = 10log
45.5 dBm
Function
10
10
10
10
10
10
10
10
10
(2620/CONL) –
(3300/COFL) –
(AONL/107) –
(AOFL/58) –
(XTML/4096)
(DTML/4868)
(DTMT/3277) –
(4096/CPDL)
(TGNL/2896)
10
(UDFSL/
Default
(dec)
4096
4868
3277
4096
4987
4987
2896
4096
2620
3300
536
536
91
67
37