[AK8817VQ]
MS1113-E-00 2009/08
-26-
( 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 Cb Y Cr Y Cb Y Cr Y
359 718 359 719 360 720 360 721 428 856 428 857 0 0 0 1
EAV
……
SAV
At PAL data input case
Cb Y Cr Y Cb Y Cr Y Cb Y Cr Y Cb Y Cr Y
359 718 359 719 360 720 360 721 431 862 431 863 0 0 0 1
EAV
……
SAV
