ASAHI KASEI
[AK8817/18]
( 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
0
1
0
0
P0
WORD
VALUE
0xFF
0x00
0x00
0xxx
7
1
0
0
1
6
1
0
0
F
5
1
0
0
V
4
1
0
0
H
3
1
0
0
P3
2
1
0
0
P2
1
1
0
0
P1
0
1
2
3
here,
F
V
H
= 0 : Field 1
= 1 : Field 2
= 0 : other than Filed Blanking (V-Blanking)
= 1 : Filed Blanking (V-Blanking)
= 0 : SAV
= 1 : EAV
P3, P2, P1, P0 : Protection Bit
Protection Bit and F / V / H relation is shown in the following table.
F
0
0
0
0
1
1
1
1
V
0
0
1
1
0
0
1
1
H
0
1
0
1
0
1
0
1
P3
0
1
1
0
0
1
1
0
P2
P1
0
0
1
1
1
1
0
0
P0
0
1
1
0
1
0
0
1
0
1
0
1
1
0
1
0
At NTSC data input case
Cb Cr
359 718 359 719 360 720 360 721
EAV
Y
Y
Cb
Y
Cr
Y
Cb
Y
Cr
Y
Cb
0
Y
0
Cr
0
Y
1
428 856 428 857
SAV
……
At PAL data input case
Cb
Y
Cr
Y
Cb
Y
Cr
Y
Cb
Y
Cr
Y
Cb
0
Y
0
Cr
0
Y
1
359 718 359 719 360 720 360 721
EAV
431 862 431 863
SAV
……
Rev.001E
30
2009 / 12
AKM [ ASAHI KASEI MICROSYSTEMS ]
