AM79Q031 ETC1 [List of Unclassifed Manufacturers], AM79Q031 Datasheet - Page 53

• Manufacturer Part Number: AM79Q031
• Description: Quad Subscriber Line Audio-Processing Circuit (QSLAC) Devices
• Manufacturer: ETC1 [List of Unclassifed Manufacturers]

47. Read Transmit PCM Data
48, 49. Write/Read FIR Z Filter Coefficients (FIR only)
(CDh)
(98/99h)
R/W = 0: Write
R/W = 1: Read
This command writes and reads only the FIR filter section without affecting the IIR.
Command
Output Data Byte 1
Output Data Byte 2
RSVD
Upper Transmit Data
The Z-transform equation for the Z filter is defined as:
Sample rate = 32 kHz
For i = 0 to 5 and 7
Power Up and Hardware Reset (
See note under Commands 31 and 32.
Note: Z
one. The input to the IIR filter section is first increased by a gain of 1/Z
avoiding truncation limitations through processing within this filter. The IIR filter output is then multiplied
by Z
coefficients, but it also includes the initial 1/Z
and normalization, is actually Z
Command
I/O Data Byte 1
I/O Data Byte 2
I/O Data Byte 3
I/O Data Byte 4
I/O Data Byte 5
I/O Data Byte 6
I/O Data Byte 7
I/O Data Byte 8
I/O Data Byte 9
I/O Data Byte 10
6
to normalize the overall gain. Z
6
is used for IIR filter scaling only. Its value is typically greater than zero but less than or equal to
Reserved for future use. Always write as 0, but 0 is not guaranteed when read.
XDAT contains A-law or µ -law transmit data in Companded mode.
XDAT contains upper data byte in Linear mode with sign in XDAT7.
(H
H
z
6
z
z
z
i
z ( )
=
(z) = 0)
=
C16 2
=
C1i 2
XDAT7
RSVD
z
D
0
•
1
•
+
7
z
–
–
1
m16
m1i
•
z
{
{
XDAT6
RSVD
–
5
SLAC Products
1
1
1
/Z
D
+
1
+
+
6
6
C40
C20
C41
C21
C42
C22
C43
C23
C44
C24
.
C26 2
RST
z
C2i 2
D
1
2
5
7
•
is the actual IIR filter gain value defined by the programmed
z
) Values = 0190 0190 0190 0190 0190 0190 01 0190 (Hex)
•
•
XDAT5
2 –
RSVD
–
–
D
+
m2i
6
0
m26
D
5
0
z
gain. The theoretical effective IIR gain, without the Z
6
3
[
}
1
•
z
+
–
XDAT4
C3i 2
3
RSVD
m40
m20
m41
m21
m42
m22
m43
m23
m44
m24
D
+
D
0
0
5
z
4
•
4
•
–
z
m3i
4 –
D
XDAT3
RSVD
1
+
(
4
1
D
1
z
-------------------------------------- -
3
+
5
1 z
•
C4i 2
6
–
z
, improving dynamic range and
C30
C10
C31
C11
C32
C12
C33
C13
C34
C14
D
6
1
•
3
7
•
XDAT2
RSVD
z
•
D
7
–
1
z
m4i
2
•
1 –
z
–
)
D
0
]
1
2
}
MPI Command
MPI Command
XDAT1
RSVD
D
0
1
m30
m10
m31
m11
m32
m12
m33
m13
m34
m14
D
0
1
XDAT0
RSVD
6
D
R/W
1
D
gain
0
0
53