adv7344 Analog Devices, Inc., adv7344 Datasheet - Page 77

• Manufacturer Part Number: adv7344
• Description: Multiformat Video Encoder Six 14-bit Noise Shaped Video Dacs
• Manufacturer: Analog Devices, Inc.

Mode 1—Master Option (Subaddress 0x8A = X X X X X 0 1 1)
In this mode, the ADV7344 can generate horizontal sync and odd/even field signals. When HSYNC is low, a transition of the field input
indicates a new frame, that is, vertical retrace. The ADV7344 automatically blanks all normally blank lines as per CCIR-624. Pixel data is
latched on the rising clock edge following the timing signal transitions. HSYNC and FIELD are output on the S_HSYNC and S_VSYNC
pins, respectively.
Mode 2— Slave Option (Subaddress 0x8A = X X X X X 1 0 0)
In this mode, the ADV7344 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 ADV7344
automatically blanks all normally blank lines as per CCIR-624. HSYNC and VSYNC are input on the S_HSYNC and S_VSYNC pins,
respectively.
HSYNC
HSYNC
FIELD
FIELD
622
309
DISPLAY
DISPLAY
HSYNC
FIELD
PIXEL
DATA
623
310
624
311
EVEN FIELD
ODD FIELD
625
312
Figure 106. SD Timing Mode 1, Odd/Even Field Transitions (Master/Slave)
ODD FIELD
EVEN FIELD
313
1
314
2
Figure 105. SD Slave Mode 1, PAL
315
3
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VERTICAL BLANK
VERTICAL BLANK
316
4
317
5
318
6
319
7
NTSC = 122 × CLOCK/2
PAL = 132 × CLOCK/2
320
Cb
21
Y
334
22
Cr
Y
DISPLAY
335
23
DISPLAY
336
ADV7344