HW_9_Solutions

HW_9_Solutions - ECE252 Microprocessor Fall 2008 Homework...

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Unformatted text preview: ECE252 Microprocessor Fall 2008 Homework #9 Solutions, 100 Points Due on Dec. 4, 2008 1. Chapter 8 Exercise Problems: 13(b), 16, 17, 22, 24 (60 pts) 13. (b) 32K words, base address of 8C0000 (10 pts) Answer: (10): 32K-word EPROM requires 15 address lines A 15 , A 14 , ..., A 1 for the EPROMs (Notice that !LDS and !UDS form the virtual address line of A ). The remaining upper address lines A 23 , ..., A 16 must be used for the decoder. (11): The last address of the EPROM is: $8C0000 + 32Kx2B 1 = $8CFFFF (12): The address range of the EPROM is from $8C0000 to $8CFFFF, the address decoder is designed to detect the fixed pattern $8C of the upper 8 address lines. 16.Answers: (10 pts) (a) (b) A 23 A 22 A 21 A 20 A 19 A 18 A 17 AS ROMSEL 1 0 0 1 1 0 8 C A 16 A 23 A 22 A 21 A 20 A 19 A 18 A 17 AS SEL A 16 (c). (d) 17. Answer: (10 pts) To enable chip 74LS138, !E 1 =A 23 =0, !E 2 =!A 22 =0 (A 22 =1), E=A 21 =1....
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HW_9_Solutions - ECE252 Microprocessor Fall 2008 Homework...

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