ECE252 Microprocessor Fall 2008 Homework #9 Solutions, 100 Points Due on Dec. 4, 2008 1. Chapter 8Exercise 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 A15, A14, ..., A1for the EPROMs (Notice that !LDS and !UDS form the virtual address line of A0). The remaining upper address lines A23, ..., A16must 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) A23 A22 A21 A20 A19 A18 A17 ASROMSEL 10 00 1100 8 C A16 A23 A22 A21 A20 A19 A18 A17 ASSEL A16
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