Deducing_m-map - Deducing the Memory Map from the System...

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Deducing the Memory Map from the System Decoder Assume we are given the memory system decoder shown in the adjacent figure. Knowing that this decoder is part of a 16-bit memory system, it is required to deduce the memory map, the total memory size, and the size of each chip in the system. • The first step is to prepare a memory map form for a 16-bit memory system. • The form must include fields for the memory module name, the memory module size, the address range of the module in hex, and the address range of the module in binary.
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The first step is to fill the names of the modules shown on the outputs of the decoder circuit in the memory module name field of the map
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The second step is to identify the address bits that represent the system ID field from the enable pins of the decoder. In this case the address bits A17, A18, and A19 are used to enable the decoder. In order to enable G1A and G1B of this decoder, the three bits must be low (zero).
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The third step: from the inputs of the decoder (A, B, and C) we deduce the address
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Deducing_m-map - Deducing the Memory Map from the System...

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