adv7174 Analog Devices, Inc., adv7174 Datasheet - Page 22

• Manufacturer Part Number: adv7174
• Description: Chip Scale Pal/ntsc Video Encoder With Advanced Power Management
• Manufacturer: Analog Devices, Inc.

ADV7174/ADV7179
Mode 2: Slave Option HSYNC , VSYNC , BLANK
(Timing Register 0 TR0 = X X X X X 1 0 0)
In this mode, the ADV7174/ADV7179 accepts horizontal and
vertical SYNC signals. A coincident low transition of both and
VSYNC inputs indicates the start of an odd field. A VSYNC low
BLANK
BLANK
VSYNC
HSYNC
VSYNC
HSYNC
HSYNC
BLANK
HSYNC
VSYNC
BLANK
VSYNC
522
DISPLAY
260
DISPLAY
523
622
309
261
DISPLAY
DISPLAY
524
623
310
262
525
624
311
263
EVEN FIELD
1
ODD FIELD
625
264
312
EVEN FIELD
ODD FIELD
2
265
313
1
3
266
314
2
Figure 27. Timing Mode 2 (NTSC)
Figure 28. Timing Mode 2 (PAL)
4
267
315
3
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ODD FIELD
5
VERTICAL BLANK
VERTICAL BLANK
268
EVEN FIELD
316
VERTICAL BLANK
4
VERTICAL BLANK
6
269
EVEN FIELD
ODD FIELD
317
5
transition when HSYNC is high indicates the start of an even
field. The BLANK signal is optional. When the BLANK input is
disabled, the ADV7174/ADV7179 automatically blanks all
normally blank lines as per CCIR-624. Mode 2 is illustrated in
Figure 27 (NTSC) and Figure 28 (PAL).
7
270
318
6
8
271
319
7
9
272
320
10
273
11
21
274
22
334
DISPLAY
20
23
335
283
DISPLAY
21
DISPLAY
336
284
22
DISPLAY
285