AM79Q02JC datasheet(53/68 Pages) ETC1

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SLAC Products

47. Read Transmit PCM Data

MPI Command

(CDh)

RSVD

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

Upper Transmit Data

XDAT contains A-law or

µ-law transmit data in Companded mode.

XDAT contains upper data byte in Linear mode with sign in XDAT7.

48, 49. Write/Read FIR Z Filter Coefficients (FIR only)

MPI Command

(98/99h)

R/W = 0: Write

R/W = 1: Read

This command writes and reads only the FIR filter section without affecting the IIR.

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 (RST) Values = 0190 0190 0190 0190 0190 0190 01 0190 (Hex)

(Hz(z) = 0)

See note under Commands 31 and 32.

Note: Z6 is used for IIR filter scaling only. Its value is typically greater than zero but less than or equal to

one. The input to the IIR filter section is first increased by a gain of 1/Z6, improving dynamic range and

avoiding truncation limitations through processing within this filter. The IIR filter output is then multiplied

by Z6 to normalize the overall gain. Z5 is the actual IIR filter gain value defined by the programmed

coefficients, but it also includes the initial 1/Z6 gain. The theoretical effective IIR gain, without the Z6 gain

and normalization, is actually Z5/Z6.

Command

Output Data Byte 1

XDAT7

XDAT6

XDAT5

XDAT4

XDAT3

XDAT2

XDAT1

XDAT0

Output Data Byte 2

RSVD

Command

R/W

I/O Data Byte 1

C40

m40

C30

m30

I/O Data Byte 2

C20

m20

C10

m10

I/O Data Byte 3

C41

m41

C31

m31

I/O Data Byte 4

C21

m21

C11

m11

I/O Data Byte 5

C42

m42

C32

m32

I/O Data Byte 6

C22

m22

C12

m12

I/O Data Byte 7

C43

m43

C33

m33

I/O Data Byte 8

C23

m23

C13

m13

I/O Data Byte 9

C44

m44

C34

m34

I/O Data Byte 10

C24

m24

C14

m14

Hz z

() z0 z1 z

–

•

z2 z

–

•

z3 z

–

•

z4 z

–

z5 z6 z7 z

–

•

1z7 z

•

–

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

•

C1i 2

m1i

–

•

1C2i 2

m2i

–

1C3i 2

m3i

–

•

1C4i 2

m4i

–

•

()

[]

•

{}

C16 2

m16

–

•

1C26 2

m26

–

•

{}

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