mpc823rg Freescale Semiconductor, Inc, mpc823rg Datasheet - Page 514

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

Communication Processor Module
16.3.4.7.3 MOD Parameter Packet. The MOD parameter packet is composed of seven
16-bit half-words and is described in the table below.
16.3.4.7.4 Application Example. The MOD is used in the modulator. The following
example demonstrates how the function descriptor structure can be used to implement the
MOD functions.
16.3.4.8 DEMOD–REAL SIN; REAL COS, REAL X, AND COMPLEX Y. The DEMOD
function implements a basic demodulator function with a modulation table composed of (cos
buffer with size M+1 and the output data is in a circular buffer with size N+1. The AGC
parameter controls the demodulator gain.
OFFSET + 0
OFFSET + 2
nT, sin nT) pairs, real input samples, and complex outputs. The input data is in a circular
Half-word 1
Half-word 2
Half-word 3
Half-word 4
Half-word 5
Half-word 6
Half-word 7
ADDRESS
0
S
1
0
XYPTR
NAME
MPTR
RES
M
Figure 16-26. DEMOD Implementation Example
K
N
I
W
2
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Table 16-14. MOD Parameter Packet
3
I
IMAG Y n
Number of Iterations
Modulation Table Size-1. The minimum modulation table size is 8 (2 sin/cos pairs).
Pointer to Modulation Table Pointer
Samples Buffer Size-1. The minimum sample buffer size is 8 (2 samples).
Pointer to a structure composed of the input sample data pointer and the output
buffer pointer
Output Buffer Size-1. The minimum output buffer size for x=1 is 8 (2 outputs). The
minimum output buffer size for x=0 is 4 (2 samples).
Reserved
{REAL}
REAL Y n
X(n)
MPC823 REFERENCE MANUAL
4
0
Go to: www.freescale.com
5
0
cos nT, sin nT, AGC
=
=
I=3 (THREE ITERATIONS)
1 AGC
6
0
1 AGC
+
+
{REAL}
7
0
X n
X n
8
0
DESCRIPTION
–
9
0
cos
{COMPLEX}
sin
Y(n)
nT
nT
0
0
11
12
01000
13
MOTOROLA
14
15