AK8859VQ Datasheet, PDF (30/73 Pages) Asahi Kasei Microsystems – NTSC/PAL/SECAM Digital Video Decoder

[AK8859VQ]
[7.19.] VLOCK mechanism
The AK8859VQ synchronizes internal operation with the input signal frame structure. If, for example, the
frame structure of the input signal comprises 524 lines, the internal operation will have structure of 524
lines per frame. This mechanism is termed the VLOCK mechanism. If an input signal changes from a
structure of 525 lines per frame to one of 524 lines per frame, internal operation will change accordingly,
and the VLOCK mechanism will go to UnLock via a pull-in process. In such case, the UnLock status can be
confirmed via the control register [VLOCK-bit*]. Note that the time required for locking of the VLOCK
mechanism upon channel or other input signal switching will be about 4 frames (*Sub-address:0x15-“bit1”)
Furthermore, the AK8859VQ synchronizes internal operation with the vertical SYNC of the input signal.
This mechanism is termed the direct LOCK mechanism.
Setting for Vertical SYNC mechanism
Name
Definition
VERTS
Vertical SYNC mechanism
[0]: VLOCK mechanism
[1]: Direct LOCK mechanism
Sub Address: 0x07 [7]
[7.20.] Y/C separation
The adaptive two-dimensional Y/C separation of the AK8859VQ utilizes a co-relation detector to select the
best-correlated direction from among vertical, horizontal, and diagonal samples, and selects the optimum
Y/C separation mode.
For NTSC-4.43, PAL-60, and SECAM inputs, the Y/C separation is one-dimensional only, regardless of the
setting.
Setting for Y/C separation
Name
Setting YC separation
Value
mode
[00]
Adaptive
YCSEP0 [01]
1-D
~
YCSEP1 ^[10]
2-D
[11]
Reserved
Notes
1-D (BPF)
(NTSC-M,J, PAL-M): 3 Line 2-D
(PAL-B,D,G,H,I,N,Nc): 5 Line 2-D
Sub Address: 0x08 [1:0]
[7.21.] EAV/SAV code
The EAV/SAV code of ITU-R BT.656 standard interface can be output with the output data DATA[7:0] by the
register setting.
Setting for EAV/SAV code output
Name
Definition
EAVSAVN
[0]: EAV/SAV code is fed to the output data.
[1]: EAV/SAV code is not output.
Sub Address: 0x08 [2]
In case of LIMIT601=[0]*, if EAVSAVN is setting to [1], the output code range is limit to 0～255.
*Sub Address: 0x04 [3]
MS1178-E-00
AKM Confidential
- 30 -
2010/04