HMP8117_07 Datasheet, PDF (32/45 Pages) Intersil Corporation – NTSC/PAL Video Decoder

HMP8117
TABLE 38. VIDEO GAIN ADJUST REGISTER
BIT
NO.
FUNCTION
SUB ADDRESS = 1D_H
DESCRIPTION
RESET
STATE
7-0
Video Gain Adjust This register is enabled by the selection of “fixed gain control” mode in the Analog Input Control
80_H
register 05_H bits 7-4. The value of this register selects a combined analog attenuation and a
digital gain factor which is applied to both Luma and Chroma input channels. The gain factor is
selected from nonlinear lookup table and may range in value from 0.5x (CE_H) to 1.99x (33_H).
Refer to Table 39 below. The Register Values in italics below mark the approximate analog
attenuation ladder switching points.
Video
Gain
Reg.
Value
Video
Gain
TABLE 39. VIDEO GAIN REGISTER LOOKUP TABLE
Reg.
Value
Video
Gain
Reg.
Value
Video
Gain
Reg.
Value
Video
Gain
Reg.
Value
Video
Gain
Reg.
Value
0.50 206/CEH
0.51 202/CA_H
0.52 197/C5_H
0.53 193/C1_H
0.54 191/BF_H
0.55 187/BB_H
0.56 183/B7_H
0.57 180/B4_H
0.58 178/B2_H
0.59 174/AE_H
0.60 171/AB_H
0.61 169/A9_H
0.62 167/A7_H
0.63 164/A4_H
0.64 161/A1_H
0.65 159/9F_H
0.66 156/9C_H
0.67
153/99_H
0.84
123/7B_H
1.03
0.68
151/97_H
0.85
121/79_H
1.04
0.69
150/96H
0.86
119/77_H
1.05
0.70
147/93_H
0.87
118/76_H
1.06
0.71
145/91_H
0.88
117/75_H
1.07
0.72
143/8F_H
0.89
115/73H
1.08
0.73
141/8D_H
0.90
114/72_H
1.09
0.74
139/8B_H
0.91
113/71_H
1.10
0.75
137/89_H
0.92
111/6F_H
1.12
0.76
136/88_H
0.94
110/6E_H
1.13
0.77
134/86_H
0.95
109/6D_H
1.14
0.78
132/84H
0.96
107/6B_H
1.15
0.79
130/82_H
0.97
106/6A_H
1.16
0.80
128/80_H
0.98
104/68_H
1.18
0.81
126/7E_H
1.00
103/67_H
1.20
0.82
125/7D_H
1.01
102/66_H
1.21
0.83
124/7C_H
1.02
101/65H
1.22
100/64_H
99/63_H
98/62_H
97/61_H
96/60_H
95/5F_H
94/5E_H
93/5D_H
92/5C_H
91/5B_H
90/5A_H
89/59_H
88/58H
87/57_H
86/56_H
85/55_H
84/54_H
1.23
1.25
1.27
1.28
1.30
1.31
1.33
1.34
1.37
1.38
1.40
1.42
1.44
1.46
1.48
1.51
1.52
83/53_H
82/52_H
81/51_H
80/50_H
79/4F_H
78/4E_H
77/4DH
76/4C_H
75/4B_H
74/4A_H
73/49_H
72/48_H
71/47_H
70/46_H
69/45_H
68/44H
67/43_H
1.55
1.57
1.59
1.63
1.65
1.67
1.70
1.73
1.76
1.79
1.82
1.86
1.89
1.93
1.97
1.99
66/42_H
65/41_H
64/40_H
63/3F_H
62/3E_H
61/3D_H
60/3C_H
59/3BH
58/3A_H
57/39_H
56/38_H
55/37_H
54/36_H
53/35_H
52/34_H
51/33H
BIT
NO.
FUNCTION
7-6
Reserved
5-0
Sharpness
Adjust
TABLE 40. SHARPNESS ADJUST REGISTER
SUB ADDRESS = 1E_H
DESCRIPTION
Specifies the amount of high frequency gain control for luminance signals (either 2.6MHz or
F_SC), as determined by the Luma Processing register 08_H. The gain ranges from +12dB (11
1111_B) to -12dB (00 0100_B). A value of 0dB (“01 0000”) has no effect on the data.
RESET
STATE
00_B
010000_B
32
FN4643.3
April 19, 2007