Chapter 9

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Connections Between CPU and MemoryControl signals8088 MemoryData BusAddress bus What are the control signals from the microprocessor to memory?What are the control signal from memory to the microprocessor? Address and data signals should be buffered—a buffer is a "midpoint holding place”, “temporary address / data holding” place—The use of buffers on address bus increases driving capability—The buffer allows each device or process to operate without being held up by theother-CPU operates faster then the memory devices, buffer used to store the address or data
Memory Control Signals : Minumim ModeControl Signals produced by 8088/8086 to support the interface memorysubsystemMin. mode of 8088 and 8086 = control signals produced for Input/Outputinterface circuitMax. mod , signals for IO and memory are not same. Min Mode of 8088 ( 8086 ):ALE, IO/M’, DT/R’, RD’,WR’,DEN’Which bus is carrying a valid address, direction of data transfer, when to readdata , when to write data IO/M’ is always =0 ; indicating a memory operation (IO’/M ; always logic 1)DT/R’ : 1 when transmiting mode & data is writing to memoryDT/R’ :0 when receiving mode ; readingRD’/WR’ : reading or writing bus cycle. DEN’ : to enable the data bus ( BHE ‘ ) SSO’ : indicating a code or data on transfer: Ex : mov ax, 1234
Page 3: 1 MEMORY CONTROLSIGNALS
Page 7 and 8: Memory Control Signals : Maximum Mo
Page 9 and 10: Read and write bus cycle
Page 11 and 12: Write Bus Cycle 8088- minmode
Page 13 and 14: T1 T2 T3 T48086 Write CycleCLK/S0,
Page 15 and 16: 8086 Read Cycle (1 Wait StateT1 T2
Page 17 and 18: 8088 minimum mode MIC block diagram
Page 19: Finally …. ( minimum ) 8086 or 80
Page 22: Address Latch circuit: = 74F3738 in
Page 25 and 26: Address bus with latch and Decoder
Page 27 and 28: Bank Write and Bank Read Control Lo
Page 29 and 30: Data Bus Transceiver Design ( 8086
Page 31 and 32: Note that G input is the control in
Page 33 and 34: 74LS 138 ( address decoder )
Page 35 and 36: 4. . MEMORY SUBSYSTEMSTypes of memo
Page 37 and 38: Primary and Secondary MemoryCompute
Page 39 and 40: Memory Hierarchy
Page 41: Memory DevicesROM MemoryROM permane
Page 45 and 46: Memory Connections: diagramAddress[
Page 47 and 48: ExampleEx 1. MC has 12 address pin
Page 49 and 50: 1) Address decoding using simple NA
Page 51 and 52: Semiconductor Memory Device Archite
Page 53: Address decoding using simple NAND
Page 56 and 57:
Address decoding using a programmab
Page 58:
Data integrity How to ensure data r
Page 62 and 63:
Design a 1MB memory system consisti
Page 64:
Memory Address Decoding Design a 1M
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Chapter 9

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