AM79C03 AMD [Advanced Micro Devices], AM79C03 Datasheet - Page 36

• Manufacturer Part Number: AM79C03
• Description: Dual Subscriber Line Audio Processing Circuit (DSLAC) Devices
• Manufacturer: AMD [Advanced Micro Devices]

30. Write B Filter Coefficients
36
(86h)
The Z-transform equation for the B filter is defined as:
The coefficients for the FIR B section and the gain of the IIR B section are defined as:
The feedback coefficient of the IIR B section is defined as:
Warning: Not all B filter coefficients are “valid” to initiate adaptive balance. One valid coefficient is set
Command
Input Data Byte 1
Input Data Byte 2
Input Data Byte 3
Input Data Byte 4
Input Data Byte 5
Input Data Byte 6
Input Data Byte 7
Input Data Byte 8
Input Data Byte 9
Input Data Byte 10
Input Data Byte 11
Input Data Byte 12
Input Data Byte 13
Input Data Byte 14
as: 2A F2 AF 2A F2 AF 2A F2 AF 2A F2 AF 0A 80, which corresponds to all FIR coefficients
(B0–B7) equal to zero, and the IIR denomination coefficient (B8) equal to 1/2. Other valid
coefficients that may reduce the time to convergence of the algorithm may be obtained by
reading back the registers after adaptive balance has been run (see Command 31).
H
B
B
i
8
B
=
=
z
Cli 2
C18 2
=
B
0
Am79C02/03/031(A) Data Sheet
+
–
m1i
–
B
m18
1
z
1
–
1
+
1
+
C2i 2
+
B
C28 2
C30
C10
C21
C32
C12
C23
C34
C14
C25
C36
C16
C27
C48
C28
2
D
1
z
7
2 –
+
–
m2i
B
–
m28
3
z
D
1
0
3 –
6
+
1
+
C3i 2
+
B
C38 2
4
z
m30
m10
m21
m32
m12
m23
m34
m14
m25
m36
m16
m27
m48
m28
–
D
4
0
5
–
+
m3i
B
–
m38
5
z
5 –
D
1
0
+
4
+
B
C48 2
6
z
–
6
C20
C31
C11
C22
C33
C13
C24
C35
C15
C26
C37
C17
C38
C18
+
D
0
3
---------------------- -
1 B
–
B
–
m48
7
z
8
7 –
z
1 –
D
1
2
m20
m31
m11
m22
m33
m13
m24
m35
m15
m26
m37
m17
m38
m18
D
1
1
D
0
0