AM79C02 datasheet(41/48 Pages) AMD

41 / 48 page

SLAC Products

43. Read Adaptive B Filter Coefficients

(91h)

44. Write Operating Functions 2

(64h)

Chopper Clock Control

CHP = 0

Chopper Clock is 256 kHz

CHP = 1

Chopper Clock is 292.571 kHz

Adaptation Control

EAC = 0

LST, DCR1, and DCR2 are disabled

EAC = 1

LST, DCR1, and DCR2 are enabled

EPB = 0

DPB is disabled

EPB = 1

DPB is enabled

45. Read Operating Functions 2

(65h)

RSVD

Reserved. Always write as 0, but 0 is not guaranteed when read.

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:

Eq. (1)

where the number of taps in the filter = n + 1.

The transfer function for IIR part of Z and B filters is:

Eq. (2)

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:

Eq. (3)

where:

Mi = the number of shifts ≤ Mi + 1

Bi = sign = ±1

N = number of CSD coefficients

New to Revision E

Command

10010001

Output data

C20

m20

C10

m10

Output data

C21

m21

C11

m11

Output data

C32

m32

C22

m22

Output data

C12

m12

C33

m33

Output data

C23

m23

C13

m13

New to Revision E

Command

01100100

Input data

RSVD

CHP

EAC

EPB

New to Revision E

Command

01100101

Output data

RSVD

CHP

EAC

EPB

HF z

() h

–

… h

–

+++

HI z

()

()z

–

---------------------------------

–

… B

–

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