also the system control circuit of the whole player.
AE45164016 is a piece of 4M*16bit large capacity SDRAM, with the operation voltage of +3.3 V.
In DV971, the 6ns module is adopted, with high speed and the maximum operation frequency up
to 166MHz. Its main function is for operation buffer storage of decoding chip MT1389 to store the
audio and video data stream in decoding.
29LV160BE is a piece of 16Mbit FLASH ROM, with the operation voltage of +3.3V, mainly for
storing the user’
s information including OSD character information, operational microcode and
LOGO in start- up.
II. Audio and Video Output Circuit
1. Video output circuit
DK1010S can not only output three types of alternating- line video signal (including CVBS
composite video, S terminal Y-C signal and Y/Cb/Cr color difference signal), but also output two
types of progressive line video signal (including Y/Pb/Pr progressive line color difference signal
and VGA progressive line signal).
The decoding chip MT1389 has built- in video encoding circuit for direct output of analogue
composite video signal CVBS, S terminal, color difference signal and VGA signal.
The CVBS composite video signal is outputted from the Pin 198 of MT1389, the S terminal signal
Y-C is outputted from the pins 194 and 196 of MT1389, the color difference signal and the R-B-G
signal of VGA port is outputted from the pins 203, 202 and 200 of MT1389, the row and field
synchronization signals of VGA port are outputted from the pins 207 and 205 of MT1389
respectively.
To mention specifically, the alternating- line color difference signal, the progressive line color
difference signal and progressive line R-B-G signal are outputted from the same pin, therefore the
signal output shall be selected according to the ports of TV, otherwise there will be only sound but
without picture display.
2. Audio output circuit
Audio signals processed by MT1389 output 5-track data signals through pin 217, pin 218 and pin
219 and 5-channel clock signals through pin 214 and pin 215. These signals after passing through
CLK
DQML
DQMH
CKE
113
RAS
CAS
CS
WE
BA0
BA1
15
39
38
37
18
17
19
16
20
21
137
156
157
140
139
142
138
145
143
DMA0
—
DMA11
DQ0
—
DQ15
77
A0
—
A21
AD0
—
AD7
DCE
DRD
DWR
RY/BY
BYTE
AE45164016
MT1389
29LV160BE
26
28
11
15
47
79
66
VD
GND
Figure
VII
