參數(shù)資料
型號(hào)： AM79Q021VC
廠商： ADVANCED MICRO DEVICES INC
元件分類： 編解碼器
英文描述： PCM CODEC, PQFP44
封裝： TQFP-44
文件頁數(shù)： 49/64頁
文件大?。?/td> 911K
代理商： AM79Q021VC
SLAC Products
53
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
-law transmit data in Companded mode.
XDAT contains upper data byte in Linear mode with sign in XDAT7.
Old Data Flag
OLD = 0
Transmit data byte contains new data.
OLD = 1
Transmit data byte contains old data.
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
D7
D6
D5
D4
D3
D2
D1
D0
Command
1
0
1
0
1
Output Data Byte 1
XDAT7
XDAT6
XDAT5
XDAT4
XDAT3
XDAT2
XDAT1
XDAT0
Output Data Byte 2
RSVD
OLD
D7
D6
D5
D4
D3
D2
D1
D0
Command
1
0
1
0
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
H
z z
() z
0
z
1
z
1
–
z
2
z
2
–
z
3
z
3
–
z
4
z
4
–
z
5
z
6
z
7
z
1
–
1z
7
z
1
–
---------------------------------------
+
++
=
z
i
C1i
2
m1i
–
1C2i
2
m2i
–
1C3i
2
m3i
–
1C4i
2
m4i
–
+
()
+
[]
+
{}
=
z
6
C16
2
m16
–
1C26
2
m26
–
+
{}
=
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