36-28
MPC860 PowerQUICC UserÕs Manual
MOTOROLA
Part V. The Communications Processor Module
The status and control bits (at offset 0x00) are described in Table 36-2. The LMS2
parameter packet consists of seven 16-bit entries and is described in Table 36-26.
36.16.3 LMS2 Applications
The LMS2 is used in updating fractionally spaced equalizer coefÞcients.
36.17 Weighted Vector Addition (WADD)ÐReal X and
Real Y
Using two real, scalar coefÞcients
a
and
b,
the WADD function generates a linear
combination of two real input vectors. Figure 36-34 shows the WADD output vector Y as a
function of the two input vectors X
1
and X
2
.
Figure 36-34. WADD Function
36.17.1 WADD CoefÞcients and Input Buffers
Each input vector is stored in a circular buffer containing (M+1) bytes. Each sample is a
16-bit entry and the next sample is stored in the address that follows the previous sample.
The output buffer is a circular buffer that contains (N+1) bytes. Each output is 16 bits and
the newest output is stored in the address that follows the previous one.
Table 36-26. LMS2 Parameter Packet
Address
Name Description
Hword 1
Ñ
Reserved
Hword 2
K
Number_of_taps - 1
Hword 3
CBASE
Filter coefÞcient vector base address
Hword 4
M
Input buffer_size - 1. The minimum input buffer size is 8 (2 samples).
Hword 5
XPTR
Pointer to input buffer pointer
Hword 6
EPTR
Pointer to scalar
Hword 7
Ñ
Reserved
Y n
( )
a
X
1
n
( ) b
X
2
n
( )
+
=
Summary of Contents for MPC860 PowerQUICC
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Page 78: ...I iv MPC860 PowerQUICC UserÕs Manual MOTOROLA Part I Overview ...
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Page 226: ...8 32 MPC860 PowerQUICC UserÕs Manual MOTOROLA Part II PowerPC Microprocessor Module ...
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Page 325: ...MOTOROLA Part IV Hardware Interface IV v Part IV Hardware Interface ...
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