Circuit Descriptions
5-16
5-6 Video
5-6-1 Outline
ZIC1(A/V decoder with video encoder) diverges from the 27MHz crystal, then generates VHSYNC and HSYNC.
ZIC1(A/V decoder with video encoder) does RGB encoding, copy guard processing and D/A conversion of 8bit
video data internally inputted from video decoder block by MIC1(Micom).
Video signal converted into analog signal is outputted via amplifier of analog part.
(Main Board)
(Output Board)
ZIC1
A/V Decoder with
video encoder
ZiVA-4.1
MIC1
Main Micom
TMP95C265F
Video
data
Low Pass Filter
(6MHz)
VIC1
Amplifier
BA7660
VIC2
Amplifier
BA7660
CVBS1
CVBS2
Y
C
Y
Pr
Pb
CVBS_S
Y/Pb
C/Pr
CVBS/Y
Fig. 5-21 Video Output Block Diagram
5-6-2 NTSC Digital Encoder (ZIVA-4.1 ; Built-in video encoder)
ZIC1 inputted from pin159 with 27MHz generates HSYNC and VSYNC which are based on video signal.
ZIC1 is synchronous signals with decoded video signal and control the output timing of 8bit video signal of ITU-
R601 format.
The inputted 8bit data which decoded from video decoder block is demuxed with each 8bit of Y, R-Y, B-Y. The
separate signal is encoded to NTSC by control of MIC1.
The above signals, which are CVBS(Composite Video Burst Synchronized)/G(GREEN)/Y[PIN139],
Y(S_VIDEO)/B(BRUE)/Pb[PIN145] and C(S_VIDEO)/R(RED)/Pr[PIN151], are selectively outputted CVBS
+S_VIDEO, Y+Pr+Pb by the rear switch.
In Course of encoding,8bit data can extend to 10bit or more. To convert the extended data to quantization noise as
possible,ZIC1 adopts 10bit D/A converter. ZIC1 perform video en-coding as well as copy protection.
Содержание DVC-605U
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