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參數(shù)資料
| 型號： | T8536B |
| 元件分類： | Codec |
| 英文描述： | T8535B/T8536B Quad Programmable Codec |
| 中文描述： | T8535B/T8536B四可編程編解碼器 |
| 文件頁數(shù)： | 42/50頁 |
| 文件大?。?/td> | 929K |
| 代理商： | T8536B |
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42
Agere Systems Inc.
Preliminary Data Sheet
September 2001
T8535B/T8536B Quad Programmable Codec
Software Interface
(continued)
Table 21. Control Bit Definition
(continued)
Control Name
(Address, Decimal)
[Address, Hex]
PCMCTRL2
(145)
[0x91]
Bit
Assignment(s)
Function
6—7
5
Load as zeros.
A one selects DX PCM port 1. A zero selects DX PCM port 0. Defaults
to zero. PCM port 1 is not available in all package types.
A one selects DR PCM port 1. A zero selects DR PCM port 0. Defaults
to zero. PCM port 1 is not available in all package types.
A one selects double-clocking mode. Defaults to zero (single-clocking
mode). A write to any channel affects all four channels.
A one starts transmit data on a falling BCLK edge. A zero starts transmit
data on a rising BCLK edge. Defaults to zero. A write to any channel
affects all four channels.
A one latches receive data on a rising BCLK edge. A zero latches
receive data on a falling BCLK edge. Defaults to zero. A write to any
channel affects all four channels.
A one latches FS on a rising BCLK edge. A zero latches FS on a
falling BCLK edge. Defaults to zero. A write to any channel affects all
four channels.
Load as zero.
Enable
digital loopback 3
. Defaults to zero (no loopback).
RTZ gain. Defaults to 3 (equal level point value of 3 * 0.075 = 0.225).
Turn off by writing to zero.
Transmit analog gain (XAG). Defaults to
1 (6 dB) gain.
4
3
2
1
0
SDCTRL
(146)
[0x92]
7
6
3—5
0—2
Bit Number
2
1
0
0
0
0
0
1
0
1
1
0
Function
(dB)
0.0
6.02
12.04
18.06
24.08
0
0
1
0
1
0
SDTSI
(147)
[0x93]
7
6
Load as zero.
Digital loopback, receive to transmit at the sigma-delta converters
(
digital loopback 2
). Defaults to zero (no loopback).
Analog channel feeding this digital channel in the transmit direction.
Defaults to channel number.
Send idle-channel code (alternating bits) to this analog receive path.
Defaults to zero (off).
Loopback from transmit to receive at the sigma-delta converters
(
analog loopback 1
). Defaults to zero (no loopback).
Digital channel feeding this analog receive channel. Defaults to channel
number.
Gain control for gain transfer stage in transmit direction. Defaults to
0x0400 (0 dB). This is a 12-bit multiply operation with a maximum gain
of four (12 dB).
Coefficients for the transmit equalization stage. Varies frequency
response and accommodates current-sensing SLICs. Defaults to
0x000000.
4—5
3
2
0—1
GTX2
(148—149)
[0x94—0x95]
ZEQTX
(150—152)
[0x96—0x98]
0—11
0—20
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