mpc823rg Freescale Semiconductor, Inc, mpc823rg Datasheet - Page 515

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mpc823rg

Manufacturer Part Number
mpc823rg
Description
Mpc823 Powerquicc Integrated Communications Processor For Portable Systems
Manufacturer
Freescale Semiconductor, Inc
Datasheet
16.3.4.8.1 Modulation Table, Sample Data Buffers, and AGC Constant. The
modulation table is composed of 16-bit cosine and sine pairs that occupy K +1 bytes in
memory. The samples input buffer is a cyclic buffer containing M+1 bytes. Each sample is
a 16-bit half-word and the new sample is stored in the address that follows the previous
sample. The output buffer is a cyclic buffer that contains N+1 bytes and the new output is
stored in the address that follows the previous output. The AGC constant is in the range
-1 AGC 1.
16.3.4.8.2 DEMOD Function Descriptor. The DEMOD function descriptor bit table is
described below.
OFFSET + A
OFFSET + C
OFFSET + E
OFFSET + 0
OFFSET + 2
OFFSET + 4
OFFSET + 6
OFFSET + 8
Figure 16-27. DEMOD Modulation Table and Sample Data Buffers
0
S
MODULATION TABLE
RES
1
K + 1 bytes
cos q
cos q
cos q
sin q
sin q
sin q
W
*
*
2
1
2
n
1
2
n
Freescale Semiconductor, Inc.
For More Information On This Product,
3
I
MPC823 REFERENCE MANUAL
4
Go to: www.freescale.com
5
INPUT SAMPLES
M + 1 bytes
x(n-k+1)
6
x(n-2)
x(n-1)
x(n)
*
*
*
*
*
*
RESERVED
RES
7
XYPTR
DPTR
M
K
N
I
8
9
Communication Processor Module
OUTPUT (COMPLEX)
10
imag{Y(n-k+1)}
real{Y(n-k+1)}
imag{Y(n-2)}
imag{Y(n-1)}
real{Y(n-2)}
real{Y(n-1)}
N + 1 bytes
imag{Y(n)}
real{Y(n)}
11
*
*
*
*
*
12
OPCODE
13
14
16-63
15

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