ASX340AT_16 Datasheet, PDF (35/54 Pages) ON Semiconductor – 1/4‐inch Color CMOS NTSC/PAL Digital Image SOC

Start of digital line
ASX340AT
Start of digital active line
N
EAV CODE
BLANKING
F 00X8181
F 00Y0000
4
268
4
280
SAV CODE
CO − SITED S_ITED C_O −
8 1 F 0 0 XC
C
C
C
0 0 F 0 0 YBYR ^{YBYR Y}
4
1440
4
1440
C
F
RYF
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.
Line 4
Field 1
(F = 0)
Odd
266
Field 2
(F = 1)
Even
Blanking
Field 1 Active Vi deo
Blanking
Field 2 Active Vi deo
Line 1 (V = 1)
Line 20 (V = 0)
Line 26 4 (V =1)
Line 2 83 (V = 0)
Line 525 (V = 0)
H=1
EAV
H=0
SAV
Figure 35. Typical CCIR656 Vertical Blanking Intervals for 525/60 Video System
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.
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