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What is memory address decoder?
Address decoding refers to the way a computer system decodes the addresses on the address bus to select memory locations in one or more memory or peripheral devices. In full address decoding, each addressable memory location corresponds to a unique address value on the address bus.
What is the function of address decoder in a memory?
In digital electronics, an address decoder is a binary decoder that has two or more inputs for address bits and one or more outputs for device selection signals. When the address for a particular device appears on the address inputs, the decoder asserts the selection output for that device.
How many unique addresses would be required to access 2 to the 16 memory cells?
So 2 to the power of 16 is 65,536, commonly referred to as 64K. The number of memory words addressed on a bus is 2 to the power of the width of the address bus, in this case 16. So 2 to the power of 16 is 65,536, commonly referred to as 64K.
How to build 4 to 16 decoder using only two 2 to 4 decoders?
Which line is 1 depends on the input bit pair which can be 00, 01, 10, 11. So take two such 2 -by- 4 decoders which give you four input lines. Let the output lines be a 0, a 1, a 2, a 3 for one decoder and b 0, b 1, b 2, b 3 for the other. Use the 16 AND gates to compute the 16 functions a i ∧ b j, 0 ≤ i ≤ 3, 0 ≤ j ≤ 3.
How big is the address space of a processor?
The processor can usually address a memory space that is much larger than the memory space covered by an individual memory chip. In order to splice a memory device into the address space of the processor, decoding is necessary. For example, the 8088 issues 20-bit addresses for a total of 1MB of memory address space.
Can you use logic other than decoders in a circuit?
The question does not prohibit use of logic other than decoders so using 16 2-input and gates we have the following circuit that fulfils the requirement (Muzammal Baig) Highly active question. Earn 10 reputation (not counting the association bonus) in order to answer this question.
When does the BHE signal go low for decoding?
Address lines A13-A19 are used for decoding to generate thechip select. The BHE signal goes low when a transfer is at odd address or higher byte of data is to be accessed.