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AK8859VN Datasheet(PDF) 29 Page - Asahi Kasei Microsystems |
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AK8859VN Datasheet(HTML) 29 Page - Asahi Kasei Microsystems |
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29 / 72 page  [AK8859VN] MS1179-E-00 AKM Confidential 2010/04 - 29 - [7.19.] VLOCK mechanism The AK8859VN 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 AK8859VN synchronizes internal operation with the vertical SYNC of the input signal. This mechanism is termed the direct LOCK mechanism. Setting for Vertical SYNC mechanism Sub Address: 0x07 [7] Name Definition VERTS Vertical SYNC mechanism [0]: VLOCK mechanism [1]: Direct LOCK mechanism [7.20.] Y/C separation The adaptive two-dimensional Y/C separation of the AK8859VN 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 Sub Address: 0x08 [1:0] Name Setting Value YC separation mode Notes [00] Adaptive [01] 1-D 1-D (BPF) [10] 2-D (NTSC-M,J, PAL-M): 3 Line 2-D (PAL-B,D,G,H,I,N,Nc): 5 Line 2-D YCSEP0 ~ YCSEP1 [11] Reserved [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 Sub Address: 0x08 [2] Name Definition EAVSAVN [0]: EAV/SAV code is fed to the output data. [1]: EAV/SAV code is not output. In case of LIMIT601=[0]*, if EAVSAVN is setting to [1], the output code range is limit to 0～255. *Sub Address: 0x04 [3] |
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