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The_Design_of_a_16_biy_Memory_System

# The_Design_of_a_16_biy_Memory_System - The Memory Map...

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The Memory Map Design In designing the memory system, we first decide the size of the whole memory and the size of each memory type. Assume here that we want to design a main memory system which includes 64 Kbytes of ROM and 128 Kbytes of static RAM . Assume, also, that we have four 16 Kbytes ROM chips, four 16 Kbyte static RAM chips, and two 32 Kbytes static RAM chips. As we are designing for a 16-bit microprocessor, the memory must be organized so the we have two byte memory lines. Each two chips of the same size are coupled to provide the two bytes; one provides the low byte and the other to provide the high byte as follows: Module ROM1 2X 16 Kbytes = 32 Kbytes Module ROM2 2X 16 Kbytes = 32 Kbytes Module RAM1 2X 16 Kbytes = 32 Kbytes Module RAM2 2X 32 Kbytes = 64 Kbytes Module RAM3 2X 16 Kbytes = 32 Kbytes The 32 Kbytes are represented in Hex as 08000 hex . So we add 07FFF hex to the first location so that the range sums up to 08000 hex.

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The_Design_of_a_16_biy_Memory_System - The Memory Map...

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