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參數(shù)資料
| 型號： | Z0220516SSCR4292 |
| 英文描述： | Modem Controller |
| 中文描述： | 調制解調器控制器 |
| 文件頁數(shù)： | 32/48頁 |
| 文件大?。?/td> | 1331K |
| 代理商： | Z0220516SSCR4292 |
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Z02201
V.22bis Data Pump with Integrated AFE
ZiLOG
32
Z02201
PS000902-0501
TRANSMITTING TONES
The data pump has two tone generators, each with their own
transmit level. The outputs are mixed together. The
frequency of the tones are programmed by writing
coefficients to locations
TONEGENA
and
TONEGENB
.
The transmit levels are programmed by writing values to
locations
DTMF_LEV
and
DTMFH_LEV
. If only one tone
is to be transmitted, the other tone generator’s transmit level
is set to
0
to disable it.
Figure 9. Transmitting Tones
For example, to generate a 2100 Hz Answer Tone for 3.3
seconds at –10dBm:
1. Set location
TONEGENA
to
015FEH
.
2. Set location
DTMFL_LEV
to
0287H
.
3. Set
location
DTMFH_LEV
to
0
,
disabling
TONEGENB
.
4. Set
CONFIG
register, bits 0–6 (
MODE
) to
1
(transmit
tone).
5.
Wait 3.3 seconds, then set
CONFIG
register, bits 0–6
(
MODE
) to
0
(
STANDBY
).
DTDStatus
00
—
Discrete Tone Detector Status
This location contains the status of the tone detectors when in tone
detect mode (
Con
fi
g register, bits 0
–
6 (MODE) is 02H). Bit 0 contains the
status of detector 0, bit 1 (the status of detector 1), and so on. This
location is only valid when in tone detection mode.
The response time of the tone detectors is dependent upon the frequency
of the tone being detected and sampling rate of the data pump.
When the host sets Con
fi
g register, bits 0
–
6 (MODE) to 0 (STANDBY), or
resets the data pump, the data pump writes its part number into this
location.
Table 15. Modem Data Pump Word De
fi
nitions (Continued)
Register & Address
(hex)
Default
Value
Function and Explanation
+
*
*
High Band Tone (0x196)
Low Band Tone (0x196)
DTMFh_lev (0x1A1)
DTMFl_lev (0x1A0)
Transmitted Tones
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