mpc823rg Freescale Semiconductor, Inc, mpc823rg Datasheet - Page 515

• Manufacturer Part Number: mpc823rg
• Description: Mpc823 Powerquicc Integrated Communications Processor For Portable Systems
• Manufacturer: Freescale Semiconductor, Inc

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
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