ASX340AT

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35

F

F

0

0

0

0

X

Y

8

0

1

0

8

0

1

0

8

0

1

0

F

F

0

0

0

0

X

Y

C

B

Y

C

R

Y

C

B

Y

C

R

Y

C

R

Y

F

F

4

4

268

280

4

4

1440

1440

EAV CODE

BLANKING

SAV CODE

CO − SITED _

CO −

SITED _

Start of digital line

Start of digital active line

N

Digital

video

stream

Figure 34. CCIR656 8-Bit Parallel Interface Format for 525/60 (625/50) Video Systems

Figure 30 shows detailed vertical blanking information

for NTSC timing. Table 24 for data on field, vertical

blanking, EAV, and SAV states.

Figure 35. Typical CCIR656 Vertical Blanking Intervals for 525/60 Video System

Blanking

Field 1 Active Vi deo

Blanking

Field 2 Active Vi

deo

Line 4

266

Field 1

(F = 0)

Odd

Field 2

(F = 1)

Even

EAV

SAV

Line 1 (V = 1)

Line 20 (V = 0)

Line 26 4 (V =1)

Line 2 83 (V = 0)

Line 525 (V = 0)

H = 1

H = 0

TABLE 27. FIELD, VERTICAL BLANKING, EAV, AND SAV STATES 525/60 VIDEO SYSTEM

Line Number

F

V

H (EAV)

H (SAV)

1–3

1

1

1

0

4–9

0

1

1

0

20–263

0

0

1

0

264–265

0

1

1

0

266–282

1

1

1

0

283–525

1

0

1

0

1. NTSC defines active video from line 20 to line 263 (corresponding to a field). This allows up to 244 active video lines in a field.

2. ASX340 image output is configured to 240 lines per field; this is common practice of digital video formatting.

3. When 240 lines are displayed within a field of 244 lines, the image content should start from line 22 to line 261 of the field. This ensures center

of the image and the center of the field is aligned.

4. Similar consideration applies to Odd & Even fields.