ee357_hw6_sol

ee357_hw6_sol - EE 357 Homework 6 Spring 07 Redekopp...

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EE 357 Homework 6 Spring ’07 Redekopp Name: __Solutions________________________________ Lec. 9:30 / 11:00 / 2:00 Due: Score: ________ Note: Attach all work to receive full credit 1.) Design a memory system with (4) 1 MB RAM’s, (2) 128 KB EPROM’s, and (2) 32 KB ROM’s. The RAM portion of memory should be contiguous and start at address 0. The ROM’ portion of memory should also be contiguous and start at $D40000. a.) Draw out a memory map and show the address ranges for each of the memory chip pairs. Top (2) 1 MB RAM’s: $0 - $1FFFFF ($1FFFFE) Bottom (2) 1 MB RAM’s: $200000 - $3FFFFF ($3FFFFE) 128 KB ROM’s: $D40000-$D7FFFF 32 KB ROM’s: $D80000-$D8FFFF 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 a device label of “A 9 -A 0 ” for the address input). 1 MB RAM /CS /OE /WE A[19:0] /CS /OE /WE A[20:1] /RAM1_CS /CS /OE /WE /RAM2_CS 128 KB /CS /OE /WE A[16:0] /CS /OE /WE A[17:1] /ROM1_CS 32 KB A[14:0] /CS /OE /WE A[15:1] /ROM2_CS
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c.) Show the necessary logic for each of the /CS (Chip selects) of the 4 memory pairs. You should use full address decoding. A23 A22 A21 /AS /RAM1_CS /AS /RAM2_CS A20 /ROM1_CS A19 A18 /AS /ROM2_CS A17 /AS A16
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2.) Design a memory system with (2) 16 KB RAM’s and (2) 512 KB EPROM’s. The RAM portion of memory should start at address $4C0000. The ROM’ portion of memory should start at $A00000. Also assume there are 3 I/O devices assigned the address ranges $62C000-$62DFFF, $944E00-$944FFF 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.
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ee357_hw6_sol - EE 357 Homework 6 Spring 07 Redekopp...

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