Motorola MPC823e - Page 524

Communication Processor Module
16-70 MPC823e REFERENCE MANUAL MOTOROLA
DSP
COMMUNICATION
16
PROCESSOR MODULE
16.3.4.10.3 LMS2 Parameter Packet. The LMS2 parameter packet is composed of seven
16-bit half-words and is described in the table below.
16.3.4.10.4 Application Example. The LMS2 function is used in the fractionally spaced
equalizer coefficient update.
16.3.4.11 WADD–REAL X AND REAL Y. The WADD function receives two real vectors
and two real coefficients (α and β) as inputs. The function generates an output vector that is
the linear combination between the two input vectors, according to α and β. It is a special
case when β = 1 − α and (0 ≤ α ≤1) generates a linear interpolation between the two input
vectors.
Table 16-17. LMS2 Parameter Packet
ADDRESS NAME DESCRIPTION
Half-word 1 RES Reserved
Half-word 2 K Number of Taps-1.
Half-word 3 CBASE Filter Coefficients Vector Base Address Pointer
Half-word 4 M Samples Buffer Size-1. The minimum sample buffer size is 8 (2 samples).
Half-word 5 XPTR Pointer to New Sample Data Pointer
Half-word 6 EPTR Pointer to Scalar
Half-word 7 RES Reserved
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
OFFSET + 0
S 0 W I Z 0 INDEX 0 0 0 01011
OFFSET + 2
I=1 (ONE ITERATION)
Figure 16-32. WADD Implementation Example
Yn () α X
1
n () β X
2
n () +=