Chp3 designing bus system, memory & io copy

Designing Bus System, Memory & I/O

The 68k Address & Data Bus ,[object Object],[object Object],[object Object],D15 D0 D8 D7

The 68k Address & Data Bus Cont…

Example ,[object Object],[object Object],[object Object],a. A 0 is used to activate UDS or LDS b. A 0 is ignored, UDS and LDS are both low

Example ,[object Object],[object Object],[object Object],[object Object],a. UDS = 0, LDS = 1 b. UDS = 1, LDS = 0 c. UDS = 0, LDS = 0

Bus Buffering CPU Memory Control Data Address bidirectional unidirectional

Accessing Memory Read Data from Memory

Memory Accessing Cont… Read Data from Memory

Memory Accessing Write Data to Memory

Memory Accessing Cont… Write Data to Memory

Designing a Memory Address Decoder ,[object Object],[object Object],[object Object],[object Object]

Designing a Memory Address Decoder Cont… ,[object Object],[object Object],[object Object],EPROM or SRAM CS* SEL* AS* Memory AddressDecoder Address bus Valid Address A1-A23 AS* SEL*

Designing a Memory Address Decoder Cont…  P AS* Address bus Address bus lower section Address bus upper section Address decoder Device selector RAM switch LED ROM

Full Address Decoder ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Full Address Decoder ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Cont…

Full Address Decoder ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Cont…

Full Address Decoder ,[object Object],[object Object],[object Object],[object Object],Cont… ROM 16kbyte Not used Memory Map $000000 $3FFFFF $400000 $FFFFFF

Full Address Decoder ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Cont…

Full Address Decoder ,[object Object],[object Object],[object Object],Cont…

Partial Address Decoder ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Partial Address Decoder ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Cont…

Partial Address Decoder ,[object Object],Cont…

Generating ,[object Object],[object Object],[object Object]

Generating ,[object Object],[object Object],Cont…

Direct Memory Access (DMA) ,[object Object],[object Object]

Direct Memory Access (DMA) Cont…

Direct Memory Access (DMA) ,[object Object],[object Object],Cont…

Memory-Mapped I/O ,[object Object],[object Object],[object Object]

Memory-Mapped I/O ,[object Object],[object Object],Cont…

Parallel Data Transfer: 6821 PIA

Serial Data Transfer: 6850 ACIA

Chp3 designing bus system, memory & io copy

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