AK8817_06 Datasheet, PDF (25/44 Pages) Asahi Kasei Microsystems – NTSC/PAL Digital Video Encoder

ASAHI KASEI
[AK8817]
( 1 ) EAV Synchronization
an EAV code which is encoded on input signal is decoded, and the device makes synchronization with its timing.
EAV / SAV codes are as follows.
Those codes succeeding 0xFF- 0x00- 0x00 which are fed as input data in 8-bit form become EAV / SAV codes.
EAV / SAV codes have following meanings, starting with MSB.
Bit Number
MSB
LSB
WORD VALUE
7
6
5
4
3
2
1
0
0
0xFF
1
1
1
1
1
1
1
1
1
0x00
0
0
0
0
0
0
0
0
2
0x00
0
0
0
0
0
0
0
0
3
0xxx
1
F
V
H
P3
P2
P1
P0
here,
F = 0 : Field 1
= 1 : Field 2
V = 0 : other than Filed Blanking (V-Blanking)
= 1 : Filed Blanking (V-Blanking)
H = 0 : SAV
= 1 : EAV
P3, P2, P1, P0 : Protection Bit
Protection Bit and F / V / H relation is shown in the following table.
F
V
H
P3
P2
P1
P0
0
0
0
0
0
0
0
0
0
1
1
1
0
1
0
1
0
1
0
1
1
0
1
1
0
1
1
0
1
0
0
0
1
1
1
1
0
1
1
0
1
0
1
1
0
1
1
0
0
1
1
1
0
0
0
1
At NTSC data input case
Cb Y Cr Y Cb Y Cr Y
359 718 359 719 360 720 360 721
EAV
……
Cb Y Cr Y Cb Y Cr Y
428 856 428 857 0 0 0 1
SAV
At PAL data input case
Cb Y Cr Y Cb Y Cr Y
359 718 359 719 360 720 360 721
EAV
……
Cb Y Cr Y Cb Y Cr Y
431 862 431 863 0 0 0 1
SAV
MS0413-E-03
25
2006 / 05