address decoding.pdf
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This document discusses addressing memory and ports through the use of decoders. It describes how 3-to-8 decoders are used as address decoders to enable specific ROM, RAM, or port devices based on the address. Parallel ROMs are addressed using decoders, with a 12-bit address allowing up to 4KB of memory. RAM decoders allow up to 8 RAM chips to be addressed using 11 address lines. Port decoders translate memory addresses to select signals for input/output ports, allowing ports to be accessed using memory instructions. Memory banks for the 8086 use address lines A1-A19 to select memory within the bank, and A0 and a bus enable line to separately address the lower and upper banks.
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This ppt explains the 7th chapter of book "LYLA B DAS" . It covers the memory and i/o in 8086 microprocessor.
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This document discusses interfacing memory with the 8086 microprocessor. It begins by defining different types of memory like RAM, ROM, EPROM, and EEPROM. It then discusses memory fundamentals like capacity, organization, and standard memory ICs. The document explains two methods of address decoding - absolute and partial decoding. It provides examples of interfacing 32KB RAM, 32K words of memory, and a combination of ROM, EPROM, and RAM with the 8086 using address decoding techniques. Diagrams and tables are included to illustrate the memory mapping and generation of chip select logic.
DIGITAL DESIGNS SLIDES 7 ENGINEERING 2ND YEAR
This document provides information about computer memory. It discusses the different types of memory including internal memory (cache and primary memory) and external memory (magnetic disk, optical disk). It explains that memory is divided into cells that each have a unique address. It also describes the memory hierarchy from fastest and smallest capacity (cache) to slower and larger capacity (external storage). The document discusses different memory devices including RAM, ROM, DRAM and SRAM. It provides details on how memory works including addressing, read/write cycles, and decoding. It also covers programmable logic devices like PLDs, PALs, PLAs, CPLDs and FPGAs.
UNIT 2 8086 System Bus Structure.pptx
The document discusses the 8086 system bus structure. It describes the various signals of the 8086 microprocessor like the address/data bus, control signals, and clock. It explains the minimum and maximum modes of the 8086. The system bus consists of data, address, and control buses. Interrupt-driven and programmed I/O as well as direct memory access transfers are introduced. Multiprogramming and various multiprocessor configurations like coprocessor, closely coupled, and loosely coupled systems are summarized.
8051.ppt
The 8051 microcontroller has the following key features:
- 4K bytes of ROM, 128 bytes of RAM, four 8-bit I/O ports, and two 16-bit timers. It has pins for serial communication and can address up to 64K bytes each of external code and data memory. The 40-pin device uses 32 pins for I/O, with some pins having dual purposes. It uses a crystal oscillator connected to pins 18 and 19 to generate the clock signal. The 8051 has separate internal memory spaces for code and data and can access additional external memory. Special function registers like the Program Status Word and Accumulator control various functions.
Interfacing address
Interfacing involves connecting devices or programs to allow communication between a user and computer or between hardware and software. Memory interfacing specifically designs circuits that match a microprocessor's memory requirements by enabling it to read from and write to memory registers by generating appropriate signals. Address decoding is used to identify a specific memory register for a given address by decoding the microprocessor's address lines and generating a unique pulse for each possible address. This allows the microprocessor to select the appropriate memory chip, identify the register, and enable the correct buffer for reading or writing.
UNIT 2.pptx
The document discusses the system bus structure of the 8086 microprocessor. It has three parts - the data bus for data exchange, address bus for memory and I/O addressing, and control bus for coordination. It describes the minimum and maximum mode of operation, with minimum using internal 8086 signals and maximum using external bus controller. It also summarizes programmed I/O, interrupt-driven I/O, and DMA transfer for communication with peripheral devices.
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address decoding.pdf
- 1. Addressing Memory and Ports Reference: Microprocessors and Interfacing – Douglas V Hall – Chapter 7
- 2. Address Decoder • 3to8 decoders like 74LS138 serve as the address decoders. • Produces a signal which enables the ROM, RAM, or port device, which is enabled for a particular address • Makes sure that only one device is enabled at a time to put data in the bus.
- 3. Parallel ROMs with decoder
- 4. ROM address decoding • Memory size=212 *8 bit =4096*8bit=4KByte
- 5. RAM decoder • Toadd eight 2K*8 RAMs • We need 211 address line • A0-A10 will be used for this • A11, A12, and A13 are the selectors
- 6. Port Decoder
- 7. Memory Mapped I/O • Using a decoder which translates memory addressing to chip select signals for port device is called Port Decoder • Advantage: Any instruction that references memory, can be used to input data from or output data to ports • Disadvantage: Some of the system memory space is used up
- 9. Memory Bank • Odd-even memory bank is used to read or write 16 bit at a time • Address A1-A19 are used to select desired memory within the bank • A0 is used for selecting lower bank and Bus High Enable is used for selecting upper bank • It also prevents unwanted writing of data in adjacent memory location during byte operation
- 10. Addressing Decoding Type Address Data Type BHE A0 Bus Cycles Data lines used Even 0000 Byte 1 0 One D0-D7 Even 0000 Word 0 0 One D0-D15 Odd 0001 Byte 0 1 One D8-D15 Odd 0001 Word 0 1 First D8-D15 1 0 Second D0-D7
- 11. Thanks…….