Kenwood KVT-910DVD Service Manual page 41

2. Outline of Movements
Below are description on of the outline of movements of HW during DVD video and CD playback.
2-1 Movements during DVD video playback
1) The DVD mechanism transfers data read from the DVD video disk to the MPEG decoder via the AV
interface.
2) The MPEG decoder, conducts analyses of the received data at the Pre Parser (Write FIFO). Then, the
decoder divides up the data into video data, audio data, sub-picture data, navigation pack and system
data, and then stores the data in SDRAM.
AREQ
DATA [7:0]
AVALID
3) The CPU watches over the data stored in SDRAM (System Channel Buffer, Navi Pack Channel Buffer)
and when data with designated length is stored, instructs MPEG decoder to start decoding.
4) When instructed t o begin decoding on the data, the MPEG decoder reads the data stored in SDRAM and
transfers the data to decoder modules, as shown in the diagram below.
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KVT-910DVD/920DVD/930DVD/
CIRCUIT DESCRIPTION
L64021
Pre Parser
and Write
FIFO
fig.2
SDRAM
Audio ES Channel
Buffer
Video ES Channel
Buffer
SPU Channel
Buffer
fig.3
940DVD/960DVD
SDRAM
Audio ES Channel
Buffer
System Channel
Buffer
Video ES Channel
Buffer
SPU Channel
Buffer
Navi Pack Channel
Buffer
L64021
Audio Decoder
Module
Video Decoder
Module
SPU Decoder
Module
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