CS7615 datasheet(7/36 Pages) CIRRUS

7 / 36 page

CS7615

DS231PP6

The EAV/SAV code definitions are consistent with

an 8-bit data path. As per the ITU-656 recommen-

dation, the LSB’s of the CS7615 are fractional bits

which are not used when delivering 8-bit output da-

ta. In 10-bit mode, all ten digital outputs can be

connected directly to the CS7665.

The output data format from the CS7615 formatter

is shown in Figure 6. The CS7615 also outputs two

clocks, one at the pixel rate and the other at 2× the

output pixel data rate (see pin description for

CLK2XO).

The output of the formatter is avail-

able at the pins DO[0..9] and it transitions at the fall-

ing edge of the pixel rate clock CLKO. Figure 7

shows the basic output timing diagram. The falling

edges of CLKO lag the falling edges of CLK2XO

by 4 to 8 ns and both clocks have approximately

50% duty cycles.

HREF

NbT

AV*T

Blanking period

Active video

EAV code (10 bits)

Smpl.

Word

3FFh

000h

Binary

fv1P3P2P1P000

Blank code (10 bits)

Smpl.

Word

040h

repeat above word

SAV code (10 bits)

Smpl.

Word

3FFh

000h

Binary

fv0P3P2P1P000

During active video,

f = field bit; 0 (odd field), 1 (even field)

v = vertical blanking bit; 0 (active video lines), 1(vertical blanking)

P3P2P1P0 = error protection bits (as per ITU-656).

T = output pixel period

samples of mosaic data;

during vertical blanking,

040h.

At reset or power down, 040h.

Figure 6. CS7615 Output Data Format

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