
Reference Information
Samsung Electronics
2-23
DIC6 shares the data bus of micom with other devices(DVD1, EPROM, SRAM). CH2 shows the measurement of a
signal line of data bus. The inclining and rising part in CH2 indicates high impedence state after data bus floating.
The data bus is pulled up by 4.7K resistance.
¥ CH1 : ALE (MIC4-11, Address latch enable
signal)
¥ CH2 : HAD0-7 (MIC402 to 9, Main micom
address and data multiplexed bus)
¥ CH3 : HA0-7 (MIC4-19 to 12, Main micom
addreess 0-7)
Fig. 2-40
It shows access in fast page mode as waveform when DIC1 accesses external memory(4Mbit DRAM) at DVD
refresh.
¥ WE : Write enable(DIC2-7)
¥ OE : OUTPUT ENABLE (DIC2-22)
¥ RAS : RAW ADDRESS STROBE (DIC2-8)
¥ CAS : COLUMN ADDRESS STROBE (DIC2-23)
¥ ADRS : ADDRESS
¥ DATA : DATA
Fig. 2-41
It shows the external memory refresh of DIC1 and uses Cas Before Ras Refresh.
¥ DIC2 (4MDRAM) REFRESH TIME
Fig. 2-42
It shows refresh per approx. 31 usec as measurement of refresh waverform outputted by DIC1 in large timing.
Refresh time(PERIOD) of DIC2(4MDRAM)
Fig. 2-43
1
2
3
WR
OE
RAS
ADRS
CAS
DATA
RAS
CAS
RAS
CAS
Summary of Contents for DVD-905
Page 5: ...Precautions 1 4 Samsung Electronics MEMO ...
Page 7: ...Product Specifications 3 2 Samsung Electronics MEMO ...
Page 87: ...Thoubleshooting 5 26 Samsung Electronics MEMO ...
Page 93: ...Exploded View and Parts List 6 6 Samsung Electronics 6 3 Remote Control ...
Page 121: ...Electrical Parts List 7 28 Samsung Electronics MEMO ...
Page 123: ...Block Diagrams 8 2 Samsung Electronics MEMO ...
Page 124: ...Samsung Electronics 10 1 10 Wiring Diagram ...
Page 125: ...Wiring Diagrams 10 2 Samsung Electronics MEMO ...
Page 127: ...Schematic Diagrams 11 2 Samsung Electronics 11 1 SMPS ...
Page 128: ...Schematic Diagrams Samsung Electronics 11 3 11 2 FRONT ...
Page 129: ...Schematic Diagrams 11 4 Samsung Electronics 11 3 MICOM ...
Page 131: ...Schematic Diagrams 11 6 Samsung Electronics 11 5 VIDEO 1 2 3 4 5 7 8 9 10 6 11 12 13 14 15 16 ...
Page 133: ...Schematic Diagrams 11 8 Samsung Electronics 11 7 AUDIO 2 ...
Page 134: ...Schematic Diagrams Samsung Electronics 11 9 11 8 DATA PROCESSOR ...
Page 135: ...Schematic Diagrams 11 10 Samsung Electronics 11 9 A V DECORDER ...
Page 136: ...Schematic Diagrams Samsung Electronics 11 11 11 10 PICK UP DECK ...