Spring05_Test3 - ECE 2030 Test 3 Spring 2005 This is a...

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ECE 2030 Test 3 Spring 2005 This is a closed book, closed notes test, with no calculator. The test will be 60 minutes long. I pledge that I have not given nor received inappropriate aid in the completion of this test. Name: ____________________________________ Signature: __________________________________
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Problem 1 (30 Points): a) Draw the schematic of a 3 bit counter using the icon for a toggle cell. TE CLR Q b) Design a 25 second clock. That is, it runs normally till 25 seconds and then resets to zero. Use the following icon for a counter. 4 bit counter Q 0 Q 1 Q 2 Q 3 CLR CE
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Problem 2 (25 Points): a) What does DRAM stand for? b) Suppose that you want to build a 512M memory system with 32 bit words from 64M x 16 bit memory chips. Number of address lines to memory system _________ Number of address lines to each chip ___________ Number of memory banks _________ Number of chips ___________ Number of memory cells in each chip __________ Mark the following sizes for the memory chip, assume that it has the same number of rows as columns of memory cells.
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