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參數(shù)資料
| 型號： | TMC2376 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | PC-to-TV Video Standards Converter(PC到TV視頻標準變換器) |
| 中文描述： | PC到電視視頻標準轉換器（電腦到電視視頻標準變換器） |
| 文件頁數(shù)： | 23/48頁 |
| 文件大?。?/td> | 233K |
| 代理商： | TMC2376 |
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TMC2376
PRODUCT SPECIFICATION
23
P
Freeze Frame
Writing to the Frame Store can be interrupted by setting the
FRZ bit of the Mode Register. Capture will continue until the
end of the current frame.
Zoom
When zoom is activated by setting the ZOOM bit to 1 in the
Command Register, pixels are 2X replicated in the vertical
and the horizontal directions. Pixels are replicated vertically
by the Capture Engine which duplicates the loading of each
line into the Frame Store. If, for example, only 120 separate
lines are accepted, then 240 lines are written to each field
contained the Frame Store Memory. When the zoomed frame
segment is retrieved, the number of horizontal pixels is dou-
bled by duplicating each pixel twice as the pixels are read
from the Frame Store Memory.
Offset may be applied to a zoomed image through the IHO
and IVO registers as shown in Figure 14
Figure 14. Zoomed image showing offsets
Encoder Engine
All blocks following the frame store controller through to the
D/A converters are included in the encoder engine which
produces CVBS, Y/C, RGB and YUV formats with PAL or
NTSC timing.
Outgoing TV Formats
Table 3, Table 4 and Table 5 show the Horizontal and Verti-
cal Timing for the NTSC and PAL TV formats.
Horizontal timing parameters: front porch, back porch and
active video pixel counts are set by OHO, IHAW and HSC.
Input horizontal active width (IHAW) combined with the
horizontal scaling coefficient (HSC) sets the width of the
active video in pixels. OHO sets the offset of the active video
from the leading edge of sync, corresponding to the front
porch. With the active video and the front porch pixel counts
defined, the pixel count of the back porch follows.
Vertical timing parameters: vertical front porch, back porch
and active video pixel counts are set by the OVO and ILS
register values. Input lines stored, the ILS register value sets
the number of incoming lines stored per field, defining the
number of lines within the vertical active video output.
Output vertical offset, OVO establishes the displacement of
the active lines from the vertical sync, defining the front
porch and in conjunction with ILS and the selected output
format, the back porch.
Incoming Hsync
IHO
IVO
I
2366-14
Incoming Active Video Area
Zoomed
Area
Table 3. NTSC and PAL Frequencies
Table 4. NTSC and PAL 4f
SC
Clock Counts
Table 5. NTSC and PAL Vertical Timing
Television
Standard
NTSC
PAL
Field Rate
(Hz)
59.94
50.00
Lines
Per Frame
525
625
Line Rate (kHz)
15.734
15.625
Pixel Rate (MHz)
14.31818
17.734475
f
sc
(MHz)
3.579
4.433
Television
Standard
NTSC
PAL
Front
Porch
18
22
Horizontal
Sync
67
84
Breezeway
5
6
Burst
43
54
Color
Back Porch
10
12
Active
Video
767
957
Line
910
1135
Television
Standard
NTSC
PAL
Field Rate
(Hz)
59.94
50.00
Lines
Per Frame
525
625
Line Rate
(kHz)
15.734
15.625
Front
Porch (lines)
3-3.5
2.5
Vertical
Sync (lines)
3
2.5
Back Porch
(lines)
14-14.5
21
Active Video
(lines/field)
242.5
286.5
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