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T7570 View Datasheet(PDF) - Agere -> LSI Corporation

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T7570 Datasheet PDF : 28 Pages
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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, DX0 and
DX1, remain in the high-impedance state until the sec-
ond FSX 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
Function
PDN
Byte 1
Address
R/W P2 X
Byte 2
76543210
DATA
Single-byte Powerup/Powerdown P X X X X X 0 X None
Write Control Register
P 0 0 0 0 0 1 X See Table 3.
Read Control Register
P000011X
Write Interface Latch Register
P 0 0 0 1 0 1 X See Table 6.
Read Interface Latch Register
P000111X
Write Latch Direction Register
P 0 0 1 0 0 1 X See Table 5.
Read Latch Direction Register
P001011X
Write Receive Gain Register
P 0 1 0 0 0 1 X See Table 9.
Read Receive Gain Register
P010011X
Write Transmit Gain Register
P 0 1 0 1 0 1 X See Table 8.
Read Transmit Gain Register
P010111X
Write Hybrid-balance Register 1 P 0 1 1 0 0 1 X These bits are defined by
Read Hybrid-balance Register 1 P 0 1 1 0 1 1 X the Lucent T7570 hybrid-
Write Hybrid-balance Register 2
P 0 1 1 1 0 1 X balance software pro-
Read Hybrid-balance Register 2
P01
1
11
1
X
gram. Contact your
Lucent-ME Account Rep-
Write Hybrid-balance Register 3
P 1 0 0 0 0 1 X resentative for a copy of
Read Hybrid-balance Register 3 P 1 0 0 0 1 1 X this software.
Write Receive Time Slot/Port
P 1 0 0 1 0 1 X See Table 7.
Read Receive Time Slot/Port
P 1 0 0 1 1 1 X (receive instruction)
Write Transmit Time Slot/Port
P 1 0 1 0 0 1 X See Table 7.
Read Transmit Time Slot/Port
P 1 0 1 0 1 1 X (transmit instruction)
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.
Lucent Technologies Inc.
7
 

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