HMP8156 Просмотр технического описания (PDF) - Intersil
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HMP8156 Datasheet PDF : 33 Pages
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HMP8156
TABLE 7. TYPICAL VIDEO TIMING PARAMETERS
PIXELS PER LINE HBLANK REGISTER VALUES
VBLANK REGISTER VALUES
VIDEO STANDARD
TOTAL ACTIVE
START
END
START
END
FULL INPUT RESOLUTION, RECTANGULAR PIXELS
(M, NSM) NTSC
(B, D, G, H, I) PAL
(M) PAL
(N) PAL
(CN) PAL
858
720
842 (0x34a)
122 (0x7a)
259 (0x103)
19 (0x13)
864
720
853 (0x355)
133 (0x85)
310 (0x136)
22 (0x16)
858
720
842 (0x34a)
122 (0x7a)
259 (0x103)
19 (0x13)
864
720
853 (0x355)
133 (0x85)
309 (0x135)
21 (0x15)
864
720
853 (0x355)
133 (0x85)
310 (0x136)
22 (0x16)
FULL INPUT RESOLUTION, SQUARE PIXELS
(M, NSM) NTSC
(B, D, G, H, I) PAL
(M) PAL
(N) PAL
(CN) PAL
780
640
758 (0x2f6)
118 (0x76)
259 (0x103)
19 (0x13)
944
768
923 (0x39b)
155 (0x9b)
310 (0x136)
22 (0x16)
780
640
758 (0x2f6)
118 (0x76)
259 (0x103)
19 (0x13)
944
784
923 (0x39b)
155 (0x9b)
309 (0x135)
21 (0x15)
944
768
923 (0x39b)
155 (0x9b)
310 (0x136)
22 (0x16)
SIF INPUT RESOLUTION, RECTANGULAR PIXELS
(M, NSM) NTSC
(B, D, G, H, I) PAL
(M) PAL
(N) PAL
(CN) PAL
429
352
834 (0x342)
130 (0x82)
259 (0x103)
19 (0x13)
432
352
845 (0x34d)
141 (0x8d)
310 (0x136)
22 (0x16)
429
352
842 (0x34a)
122 (0x7a)
259 (0x103)
19 (0x13)
432
352
853 (0x355)
133 (0x85)
309 (0x135)
21 (0x15)
432
352
853 (0x355)
133 (0x85)
310 (0x136)
22 (0x16)
SIF INPUT RESOLUTION, SQUARE PIXELS
(M, NSM) NTSC
(B, D, G, H, I) PAL
(M) PAL
(N) PAL
(CN) PAL
390
320
758 (0x2f6)
118 (0x76)
259 (0x103)
19 (0x13)
472
384
923 (0x39b)
155 (0x9b)
310 (0x136)
22 (0x16)
390
320
758 (0x2f6)
118 (0x76)
259 (0x103)
19 (0x13)
472
392
923 (0x39b)
155 (0x9b)
309 (0x135)
21 (0x15)
472
384
923 (0x39b)
155 (0x9b)
310 (0x136)
22 (0x16)
CLK2
(MHZ)
27.0
27.0
27.0
27.0
27.0
24.54
29.5
24.54
29.5
29.5
27.0
27.0
27.0
27.0
27.0
24.54
29.5
24.54
29.5
29.5
Video Processing
.
Upsampling
Video processing begins with the 4:4:4 sampled YCbCr data
from the input processor. After overlay mixing and optional
2X upscaling, the HMP8156 upsamples the 4:4:4 data to
generate 8:8:8 data. The encoder uses linear interpolation
for the upsampling.
Filtering
If enabled, the HMP8156 lowpass filters the Y data to
5.0MHz. Lowpass filtering Y removes any aliasing artifacts
due to the upsampling process, and simplifies the analog
output filters. The Y 5.0MHz lowpass filter response is
shown in Figure 13. At this point, the HMP8156 also scales
the Y data to generate the proper output levels for the vari-
ous video standards
The HMP8156 lowpass filters the Cb and Cr data to 1.3MHz
prior to modulation. The lowpass filtering removes any alias-
ing artifacts due to the upsampling process (simplifying the
analog output filters) and also properly bandwidth-limits Cb
and Cr prior to modulation. The chrominance filtering is not
optional like luminance filtering. The Cb and Cr 1.3MHz low-
pass filter response is shown in Figure 14.
0
-10 PAL SQUARE PIXEL
CLK2 = 29.50MHz
-20
NTSC OR PAL
RECTANGULAR PIXEL
CLK2 = 27.00MHz
-30
NTSC SQUARE PIXEL
CLK2 = 24.54MHz
-40
-50
-60
0
2
4
6
8
10
12
14
FREQUENCY (MHz)
FIGURE 13A. FULL SPECTRUM
FIGURE 13. Y LOWPASS FILTER RESPONSE
12
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