KS0123 데이터 시트보기 (PDF) - Samsung
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KS0123 Datasheet PDF : 44 Pages
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KS0123 Data Sheet
MULTIMEDIA VIDEO
Timing Reference Codes
Each video line can have two timing reference codes, one at the beginning of the data block (start of active video
SAV) and one at the end (end of active video EAV) as shown in Figure 3. Each timing reference code consists of a
four byte sequence in the form FF, 00, 00 and XX as shown in Table 1. The first three words are fixed, the fourth
byte contains field and line blanking information.
Table 1: Video Timing Reference Codes
Bit # 7(MSB) 6
5
4
First
1
1
1
1
Second 0
0
0
0
Third 0
0
0
0
Fourth 1
F
V
H
Notes: F = 0 during field 1
1 during field 2
3
2
1 0(LSB) HEX
1
1
1
1
FF
0
0
0
0
00
0
0
0
0
00
P3 P2 P1 P0
XX
V = 0 elsewhere
1 during field blanking
H = 0 in SAV
1 in EAV
P3 - - P0: Protection bits (not used by the encoder)
The encoder decodes the video timing reference code that indicates the end of active video (EAV). The EAV code
shall contain the F (field) and V (blanking) bits as specified in CCIR 656. This information applies to the following
video line. The encoder ignores the start of active video (SAV) timing code.
The encoder uses the F bit for synchronization purposes. The transition of F bit is used to indicate the start of a
new field. The polarity is also used to indicate odd and even. Additional field information is supplied by the ancillary
data.
The V bit is not used for synchronization. A V of ‘1’indicates line blanking. Certain lines and half lines are blanked
regardless of the state of the V bit. In general if the V bit is high, then the encoder blanks the line (Figure 10 and
Figure 11).
Modified on May/04/2000
PAGE 8 OF 44
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