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No. 2D730-148E*O
Detailed vertical timing for NTSC mode is defined in the following table, with the 525 total
lines numbered from 0 to 524. This format included more blanked lines than the NTSC
specification in order to avoid problems with overscan in external monitors.
Table:
NTSC vertical line timing
First line
1 Last line
1 Line count
1
Function
523
I
20
I
23
Blanked lines per PAL specification
21
23
3
Extra blanked lines.
24
258
235
Active lines, even field
259
260
2
Extra blanked lines.
261
I
282
I
22
I Blanked lines per PAL specification.
283
I
286
I
4
I
Extra blanked lines.
287
520
234
Active lines, odd field
521
522
2
Extra blanked lines.
Timing for PAL signal generation
is shown in the following table.
Table: External PAL
Parameter
Pixel clock cycles
Pixel clock
1
Line active
688
Time
74.07 ps
(13.5 MHz)
50.963 ps
80% active
Line FP
Line sync
Line BP
34
2.519 ps
I
64
I
4.74 ps
I
78
I
5.78 ps
Line blanking
Line time
I
176
I
13.037
ps
864 (H)
64 ps
15.625 kHz
18.08 ms
90% active
0.384 ms
0.160 ms
1.376 ms
1.92 ms
20 ms
50 Hz
72% active
40 ms
25 Hz
72% active
Vertical active
282.5 H
Vertical FP
Vertical sync
Vertical BP
Vertical blanking
Field time
Frame time
Image size
6H
2.5 H
21.5 H
30 H
312.5 H
(270,000
13.5 MHz clocks)
525 H
(540,000
13.5 MHz clocks)
388,720 pixels
4-38
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