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No. 2D730-148E*O
NTSUPAL
encoder interface
The "encoder" interface block refers to the external digital video encoder part used to
generate
NTSUPAL
analog video signals. The 16 bit YCbCr data is converted into the
CCIR-601 4:2:2 8-bit digital video format, including synchronization
codes. This block also
outputs disrete blanking, hsync, and vsync signal for diagnostics.
The digital video output
from the encoder FPGA includes additional blank lines and pixels in order to avoid
problems with overscan in playback monitors.
The NTSC timing is shown in the following
table.
Table:
External NTSC
Parameter
I
Pixel clock cycles
I
Time
Pixel clock
Line active
1
74.07 ns
(13.5 MHz)
692
63.556 ps
81%
Line FP
I
2.074 ps
Line sync
I
64
I
4.74 ps
Line BP
I
74
I
5.48 ps
Line blanking
I
166
I
12.296
ps
Line time
858 (H)
63.556 ps
15.7 kHz
Line average data rate
I 0.53 BytesJ(40.5 MHZ cycles)
I
Vertical active
234.5 H
14.904 ms
89% active
Vertical FP
Vertical sync
10 H
0.635 ms
3H
0.190 ms
Vertical BP
I
15 H
I
0.953 ms
Vertical blanking
I
28 H
I
2.22 ms
Field time
262.5 H
(225,225
13.5 MHz clocks)
16.683 ms
59.94 Hz
72% active
Frame time
Image size
525 H
(450,450
13.5 MHz clocks)
324,548 pixels
33.36 ms
29.97 Hz
72% active
4-37
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