ADV7177 Analog Devices, ADV7177 Datasheet - Page 18

• Manufacturer Part Number: ADV7177
• Description: Integrated Digital CCIR-601 to PAL/NTSC Video Encoder
• Manufacturer: Analog Devices

ADV7177/ADV7178
Mode 2: Slave Option HSYNC, VSYNC, BLANK
(Timing Register 0 TR0 = X X X X X 1 0 0)
In this mode the ADV7177/ADV7178 accepts horizontal and vertical SYNC signals. A coincident low transition of both HSYNC and
VSYNC inputs indicates the start of an odd field. A VSYNC low transition when HSYNC is high indicates the start of an even field.
The BLANK signal is optional. When the BLANK input is disabled, the ADV7177/ADV7178 automatically blanks all normally
blank lines as per CCIR-624. Mode 2 is illustrated in Figure 21 (NTSC) and Figure 22 (PAL).
HSYNC
HSYNC
BLANK
VSYNC
BLANK
VSYNC
VSYNC
VSYNC
HSYNC
BLANK
HSYNC
BLANK
522
DISPLAY
260
DISPLAY
622
309
523
261
DISPLAY
DISPLAY
524
623
310
262
525
624
311
263
EVEN FIELD
ODD FIELD
1
625
312
264
ODD FIELD
EVEN FIELD
2
ODD FIELD
313
265
1
EVEN FIELD
Figure 21. Timing Mode 2 (NTSC)
Figure 22. Timing Mode 2 (PAL)
3
266
314
2
EVEN FIELD
ODD FIELD
4
267
315
3
5
VERTICAL BLANK
VERTICAL BLANK
VERTICAL BLANK
268
–18–
316
VERTICAL BLANK
4
6
269
317
5
7
270
318
6
8
271
319
7
9
272
320
10
273
21
11
274
334
22
DISPLAY
20
23
335
283
DISPLAY
21
336
284
DISPLAY
DISPLAY
22
285
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