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CS9210 数据表(PDF) 19 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部件名 CS9210
功能描述  Geode??CS9210 Graphics Companion DSTN Controller
PDF  39 Pages
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制造商  NSC [National Semiconductor (TI)]
网页  http://www.national.com
标志 NSC - National Semiconductor (TI)

CS9210 数据表(HTML) 19 Page - National Semiconductor (TI)

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Functional Description (Continued)
In the FRM Sequence Table it was determined through
experimentation that intensity ratios outside the range of
16/64 to 48/64 (other than 0/64 and 64/64) resulted in fre-
quency ratios that were low enough that the human eye
would be able to detect flickering more easily. However,
because the human eye is less sensitive to frequency
variations at low intensity, instead of jumping directly from
0/64 to 16/64, it appeared acceptable to gradually
increase the intensity ratio from 0/64 to 16/64. The inten-
sity ratio then slowly increases from 16/64 to 48/64 to cre-
ate a smooth transition through different gray scale levels.
The full scale intensity ratio is truncated at 48/64 inten-
tionally to reduce the effect of sudden changes in intensity
level and frequency variation.
Table 3-6. FRM Sequence Table Example For One Color Component
Input
Intensity
Frame Count from 0 to 63
Freq.
Ratio
Intensity
Ratio
0
000000000000000000000000000000000000000000000000000 0000000000000
0/64
0/64
1
000000000000000000000000000000000000000000000000000 0000000000000
0/64
0/64
2
000000010000000100000001000000010000000100000001000 0000100000001
8/64
8/64
3
000000100000100000010000010000010000001000001000000 1000001000001
10/64
10/64
4
000100010001000100010001000100010001000100010001000 1000100010001
16/64
16/64
5
000100100100100100100100100100100100100100100100100 1001001001001
21/64
21/64
6
001001001001010010010010010100100100101001001001001 0100100100101
23/64
23/64
7
001001010010010100100101001001010010010100100101001 0010100100101
24/64
24/64
8
001001010010100101001001010010100101001010010010100 1010010100101
25/64
25/64
9
001010010100101001010010100101010010100101001010010 1001010010101
26/64
26/64
10
001010010101001010100101001010100101010010100101010 0101010010101
27/64
27/64
11
001010100101010100101010010101010010101001010101001 0101001010101
28/64
28/64
12
001010101001010101010010101010100101010101001010101 0100101010101
29/64
29/64
13
001010101010101001010101010101010010101010101010010 1010101010101
30/64
30/64
14
001010101010101010101010101010100101010101010101010 1010101010101
31/64
31/64
15
010101010101010101010101010101010101010101010101010 1010101010101
32/64
32/64
16
010101010101010101010101010101011010101010101010101 0101010101011
31/64
33/64
17
010101010101010110101010101010110101010101010101101 0101010101011
30/64
34/64
18
010101010110101010101101010101011010101010110101010 1011010101011
29/64
35/64
19
010101011010101101010101101010110101010110101011010 1010110101011
28/64
36/64
20
010101101010110101011010110101011010101101011010101 1010101101011
27/64
37/64
21
010101101011010110101101011010110101011010110101101 0110101101011
26/64
38/64
22
010110101101011010110110101101011010110101101101011 0101101011011
25/64
39/64
23
010110110101101101011011010110110101101101011011010 1101101011011
24/64
40/64
24
010110110110101101101101101011011011010110110110110 1011011011011
23/64
41/64
25
010110110110110110110110110110110101101101101101101 1011011011011
22/64
42/64
26
011011011011011011011011011011011011011011011011011 0110110110111
21/64
43/64
27
011011011011011101101101101101110110110110110111011 0110110110111
20/64
44/64
28
011011011101101101110110110111011011101101101110110 1101110110111
19/64
45/64
29
011011101101110110111011011101110110111011011101101 1101101110111
18/64
46/64
30
011011101110111011011101110111011011101110111011011 1011101110111
17/64
47/64
31
011101110111011101110111011101110111011101110111011 1011101110111
16/64
48/64



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