參數(shù)資料
型號(hào)： GC4116
廠商： Electronic Theatre Controls, Inc.
英文描述： MULTI-STANDARD QUAD DUC CHIP
中文描述： 多標(biāo)準(zhǔn)四數(shù)字上芯片
文件頁(yè)數(shù)： 47/57頁(yè)
文件大?。?/td> 401K
代理商： GC4116
GC4116 MULTI-STANDARD QUAD DUC CHIP
DATA SHEET REV 1.0
19992001
GRAYCHIP,INC.
- 42 -
APRIL 27, 2001
This document contains preliminary information which may be changed at any time without notice
5.11
RESAMPLER COEFFICIENT PAGES (PAGES 32-63)
These pages store the 256 resampler coefficients. Storing resampler coefficient values is similar to storing the coefficients
for the PFIR filters. The resampler coefficients are 12 bits with the 8 LSBs written in one address, and the upper 4 bits written as
the 4 LSBs of the next address. When reading back resampler coefficients the top four bits of the second address always read
back zero.
The resampler coefficient RAM must be written in blocks of eight addresses (four coefficients). Writes to the RAM occur
when a write is done to addresses 23 or 31. Supplying coefficients in sequential order will write correctly to the RAM. If just a
portion of the resampler coefficient RAM is to be updated, then one must write in blocks of the eight addresses 16 to 23, or 24
to 31. Writing to less than eight addresses will either result in no change to the RAM or unknown changes to some coefficients.
TO LOAD A COEFFICIENT THE USER MUST WRITE IN BLOCKS OF FOUR COEFFICIENTS. ONE MUST WRITE TO
ADDRESSES 16-22 THEN ADDRESS 23 OR TO ADDRESSES 24-30 THEN ADDRESS 31.
Table 11: Resampler Coefficient Pages (Single filter mode)
Table 11 shows the coefficient register assignments when there is a single filter (NF=0). For two filters (NF=1), the two filters
are interleaved, i.e., the h
even
in Table 11 will contain one filter and h
odd
will contain the other. Four four filters (NF=3), the four
filters are interleaved, i.e., h
0
, h
4
, h
8
, ... is the first filter, h
1
, h
5
, ... is the second, etc.
Address
Page
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
h
0
h
0
h
1
h
1
h
2
h
2
h
3
h
3
h
4
h
4
h
5
h
5
h
6
h
6
h
7
h
7
h
8
h
8
h
9
h
9
h
10
h
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h
11
h
11
h
12
h
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h
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h
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h
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h
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h
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h
15
h
16
h
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h
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h
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h
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h
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24
h
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h
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h
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h
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h
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h
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h
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h
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h
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h
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h
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h
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h
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h
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h
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h
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h
127
Address
Page
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
h
128
h
128
h
129
h
129
h
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