AM79C031JC AMD (ADVANCED MICRO DEVICES), AM79C031JC Datasheet - Page 41

• Manufacturer Part Number: AM79C031JC
• Manufacturer: AMD (ADVANCED MICRO DEVICES)

Specifications of AM79C031JC

• Lead Free Status / RoHS Status: Supplier Unconfirmed

43. Read Adaptive B Filter Coefficients
44. Write Operating Functions 2
45. Read Operating Functions 2
Programmable Filters
General Description of CSD Coefficients
The filter functions are performed by a series of multi-
plications and accumulations. A multiplication is accom-
plished by repeatedly shifting the multiplicand and
summing the result with the previous value at that sum-
mation node. The method used in the DSLAC device is
known as Canonic Signed Digit (CSD) multiplication and
splits each coefficient into a series of CSD coefficients.
Each programmable FIR filter section has the following
general transfer function:
where the number of taps in the filter = n + 1.
HF z
(91h)
(64h)
(65h)
=
h
0
+
h
1
z
1 –
Chopper Clock Control
Adaptation Control
RSVD
+
New to Revision E
Command
Output data
Output data
Output data
Output data
Output data
New to Revision E
Command
Input data
New to Revision E
Command
Output data
h
2
z
2 –
+
CHP = 0
CHP = 1
EAC = 0
EAC = 1
EPB = 0
EPB = 1
Reserved. Always write as 0, but 0 is not guaranteed when read.
+
h
n
z
–
n
Eq. (1)
SLAC Products
Chopper Clock is 256 kHz
Chopper Clock is 292.571 kHz
LST, DCR1, and DCR2 are disabled
LST, DCR1, and DCR2 are enabled
DPB is disabled
DPB is enabled
RSVD
RSVD
C20
C21
C32
C12
C23
D
D
D
1
0
0
7
7
7
RSVD
RSVD
The transfer function for IIR part of Z and B filters is:
The values of the user-defined coefficients (hi) are as-
signed via the MPI. Each of the coefficients (hi) is de-
fined in the following general equation:
where:
D
D
D
0
1
1
6
6
6
M
B
N = number of CSD coefficients
HI z
hi
i
i
= sign = ±1
=
= the number of shifts
RSVD
RSVD
m20
m21
m32
m12
m23
B
D
D
D
0
1
1
=
1
5
5
5
2
-------------------------------- -
1 h
–
M1
–
RSVD
RSVD
+
n
1
D
D
D
B
+
1
0
0
4
4
4
2
1
2
z
–
1 –
M2
RSVD
RSVD
+
C10
C11
C22
C33
C13
D
D
D
0
0
0
3
3
3
+
B
M
N
CHP
CHP
2
i
D
D
D
–
0
1
1
+ 1
MN
2
2
2
EAC
EAC
m10
m11
m22
m33
m13
D
D
D
0
0
0
1
1
1
Eq. (2)
Eq. (3)
EPB
EPB
D
D
D
1
0
1
0
0
0
41