ADV7177 Analog Devices, ADV7177 Datasheet - Page 20

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

ADV7177/ADV7178
Mode 3: Master/Slave Option HSYNC, BLANK, FIELD
(Timing Register 0 TR0 = X X X X X 1 1 0 or X X X X X 1 1 1)
In this mode, the ADV7177/ADV7178 accepts or generates Horizontal SYNC and Odd/Even FIELD signals. A transition of the
FIELD input when HSYNC is high indicates a new frame, i.e., vertical retrace. 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 3 is illustrated in
Figure 25 (NTSC) and Figure 26 (PAL).
HSYNC
BLANK
BLANK
HSYNC
FIELD
FIELD
HSYNC
BLANK
HSYNC
BLANK
FIELD
FIELD
522
DISPLAY
260
DISPLAY
622
309
523
261
DISPLAY
DISPLAY
623
310
524
262
624
263
311
525
EVEN FIELD
EVEN FIELD
264
ODD FIELD
625
312
1
265
ODD FIELD
ODD FIELD
EVEN FIELD
2
313
1
Figure 25. Timing Mode 3 (NTSC)
EVEN FIELD
Figure 26. Timing Mode 3 (PAL)
266
3
314
2
ODD FIELD
267
4
315
3
268
5
VERTICAL BLANK
VERTICAL BLANK
–20–
316
4
VERTICAL BLANK
VERTICAL BLANK
269
6
317
5
270
7
318
6
271
8
319
7
272
9
320
273
10
274
11
21
22
334
283
20
DISPLAY
335
23
284
21
DISPLAY
336
DISPLAY
DISPLAY
285
22
REV. 0