LE58QL061BVC Zarlink, LE58QL061BVC Datasheet - Page 77

• Manufacturer Part Number: LE58QL061BVC
• Description: QUAD, SLAC, PROG CODEC, 3.3V, GCI, 20 I/0, PQT44, LEAD FREE
• Manufacturer: Zarlink

Power Up and Hardware Reset (RST) Value = A9F0h, (H
Note:
The default value is contained in a ROM register separate from the programmable coefficient RAM. There is a filter enable bit in Operating Func-
tions Register to switch between the default and programmed values.
COP 3. Write/Read GR Filter Coefficients
Cxy = 0 or 1 in the command above corresponds to Cxy = +1 or −1, respectively, in the equation below.
The coefficient for the GR filter is defined as:
Power Up and Hardware Reset (RST) Value = 23A1h, (H
See note under COP Command 2.
COP 4. Write/Read Z Filter FIR Coefficients
Cxy = 0 or 1 in the command above corresponds to Cxy = +1 or −1, respectively, in the equation below.
The Z-transform equation for the Z filter is defined as:
Command
Coefficient Byte 1
Coefficient Byte 2
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
GCI Command
(82/83h)
R/W = 0: Write
R/W = 1: Read
GCI Command
(98/99h)
R/W = 1: Read
R/W = 0: Write
This command writes and reads only the FIR portion of the Z filter without affecting the IIR.
Sample rate = 32 kHz
H
H
GR
z
z ( )
=
=
(
z
C10 2
0
+
z
•
1
•
–
z
m10
–
1
+
(
C40
C20
C40
C20
C41
C21
C42
C22
C43
C23
C44
C24
1
D
D
1
1
z
7
7
+
2
•
C20 2
z
Zarlink Semiconductor Inc.
–
2
•
+
D
D
0
0
GR
z
GX
6
6
–
3
m20
•
= 1.995, or +6 dB)
= 0.35547, or –8.984 dB)
z
77
(
–
1
3
m40
m20
m40
m20
m41
m21
m42
m22
m43
m23
m44
m24
D
D
+
+
0
0
5
5
C30 2
z
4
•
z
•
–
4
D
D
0
1
–
+
4
4
m30
z
------------------------------------------ -
5
1 z
(
•
1
–
z
C30
C10
+
C30
C10
C31
C11
C32
C12
C33
C13
C34
C14
6
D
D
0
1
C40 2
•
7
3
3
z
•
7
z
•
•
–
1
z
–
D
–
D
1
0
0
m40
2
2
)
)
)
)
m30
m10
m30
m10
m31
m11
m32
m12
m33
m13
m34
m14
D
D
1
0
1
1
W/R
R/W
D
D
0
0