ee357_hw6_sol

ee357_hw6_sol - EE 357 Homework 6 Fall 08 Dubois Name: _ th...

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EE 357 Homework 6 Fall ’08 ● Dubois Name: ___________________________________________ Due: Fri. Oct 24 th Score: ________ Memory System Design 1.) (20) Design a memory system with (2) 1 MB RAM’s, (2) 256 KB EPROM’s, and (2) 64 KB ROM’s. The RAM portion of memory should be contiguous and start at address $400000. The ROM’ portion of memory should also be contiguous and start at $A00000. a.) Draw out a memory map with the address ranges for each memory chip pair. (2) 1 MB RAM’s $400000 - $5FFFFF (2) 256 KB EPROM’s $A00000 - $A7FFFF (2) 64 KB ROM’s $A80000 - $A9FFFF b.) Draw out the memory chips and show the appropriate system address pin connections. Please also write in appropriate device labels for the memory chips (i.e. a 1 KB RAM would have the address device label of “A[9:0]”). You should use full address decoding. /RAM_CS = (A23’.A22.A21’.AS’)’ /EPROM_CS = (A23.A22’.A21.A20’.A19’.AS’)’ /ROM_CS = (A23.A22’.A21.A20’.A19.A18’.A17’.AS’)’ 2.) (20) Design a memory system with (2) 64 KB RAM’s and (2) 128 KB EPROM’s. The RAM portion of memory should start at address $4E0000. The ROM’ portion of memory should start at $800000. Also assume there are 3 I/O devices assigned the address ranges $B18000-$B18FFF, $C2E000 - $C2FFFF and $F00000-$F0000F a.) Draw out a memory map and show the address ranges for each of the memory chip pairs and I/O devices. Show the start and end address of the RAM and EPROM in binary indicating the breakdown of constant upper bits and actual address bits for the RAM and ROM. Don’t worry about the I/O devices. RAM MIN – 0100 1110 0000 0000 0000 0000
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ee357_hw6_sol - EE 357 Homework 6 Fall 08 Dubois Name: _ th...

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