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參數(shù)資料
| 型號(hào)： | T7570 |
| 元件分類： | Codec |
| 英文描述： | T7570 Programmable PCM Codec with Hybrid-Balance Filter |
| 中文描述： | T7570可編程PCM編解碼器與混合平衡濾波器 |
| 文件頁數(shù)： | 7/28頁 |
| 文件大小： | 567K |
| 代理商： | T7570 |
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7
Lucent Technologies Inc.
Data Sheet
October 1996
T7570 Programmable PCM Codec
with Hybrid-Balance Filter
Functional Description
(continued)
Programmable Functions
Any of the programmable registers can be modified
while the device is powered up or down.
Powerup/Powerdown Control
Following powerup initialization, powerup and power-
down control can be accomplished by writing any of the
control instructions listed in Table 2 into the T7570, with
the P bit set to 0 for powerup or 1 for powerdown. Nor-
mally, it is recommended that all programmable func-
tions be initially programmed while the device is
powered down. Power-state control can then be
included with the last programming instruction or in a
separate single-byte instruction. When the powerup or
powerdown control is entered as a single-byte instruc-
tion, bit 1 must be 0.
When a powerup command is given, all deactivated
circuits are activated, but the PCM outputs, D
X
0 and
D
X
1, remain in the high-impedance state until the sec-
ond FS
X
pulse after powerup.
Control Register Instruction
The first byte of a read or write instruction to the control
register is as shown in Table 2. The second byte has
the bit functions shown in Tables 3, 5, 6, 7, 8, and 9.
Table 2. Programmable Register Instructions
Notes:
Bit 7 of bytes 1 and 2 is always the first bit clocked into or out from the CI and CO pins. X = don't care.
P is the powerup/down control bit (0 = powerup, 1 = powerdown); see Powerup/Powerdown Control section.
Other register address codes are invalid and should not be used.
Function
Byte 1
Byte 2
PDN
Address
R/W
P2
X
DATA
7
P
P
P
P
P
P
P
P
P
P
P
P
P
P
P
P
P
P
P
P
P
6
X
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
5
X
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
4
X
0
0
0
0
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
3
X
0
0
1
1
0
0
0
0
1
1
0
0
1
1
0
0
1
1
0
0
2
X
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
1
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Single-byte Powerup/Powerdown
Write Control Register
Read Control Register
Write Interface Latch Register
Read Interface Latch Register
Write Latch Direction Register
Read Latch Direction Register
Write Receive Gain Register
Read Receive Gain Register
Write Transmit Gain Register
Read Transmit Gain Register
Write Hybrid-balance Register 1
Read Hybrid-balance Register 1
Write Hybrid-balance Register 2
Read Hybrid-balance Register 2
Write Hybrid-balance Register 3
Read Hybrid-balance Register 3
Write Receive Time Slot/Port
Read Receive Time Slot/Port
Write Transmit Time Slot/Port
Read Transmit Time Slot/Port
None
See Table 3.
See Table 6.
See Table 5.
See Table 9.
See Table 8.
These bits are defined by
the Lucent T7570 hybrid-
balance software pro-
gram. Contact your
Lucent-ME Account Rep-
resentative for a copy of
this software.
See Table 7.
(receive instruction)
See Table 7.
(transmit instruction)
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