Microprocessor Theory and Applications with 68000/68020 and Pentium

APPENDIX A

ANSWERS TO SELECTED PROBLEMS

Chapter 2

2.1	Microprocessor: CPU in a single chip. Single-chip Microcomputer : microprocessor, memory, and I/O in a single chip.
2.4(a) (d)	sign = 0, carry = 0, zero = 0, overflow = 0. sign = 1, carry = 0, zero = 0, overflow = 1.
2.6 (a) (b)	20BE (20BE) = 05, (20BF) = 02.
2.11	Scalar microprocessor can execute one instruction per cycle. Intel 80486 is a scalar microprocessor. Superscalar microprocessor can execute more than one instruction per cycle. Intel Pentium is a superscalar microprocessor.

Chapter 3

3.5 (a) (b) (c)	16,384 128 chips 4 bits
3.8 (a) (b)	20 6 × 64 decoder
3.9	Maximum Directly Addressable Memory = 16 Megabytes; 14 unused address pins Available.
3.11	Memory Chip # 1 EC00H - EDFFH Memory Chip #2 F200H - F3FFH
3.12(a)	ROM Map: 0000H - 07FFH RAM Map: 2000H - 27FFH
3.21	Cache Tag Field = 1 -bit Cache Index Field = 12-bits Cache Data Field = 32-bits
3.23	Cache word size = 36 bits.

Chapter 4

4.2

Using standard I/O, the microprocessor uses an output pin such as pin to distinguish between memory and I/O. Also, the microprocessor uses IN and OUT instructions to perform I/O operation in standard I/O. Using memory-mapped I/O, the microprocessor uses an unused address pin to distinguish between memory and I/O. The ports are mapped as memory locations. Memory-oriented instructions are used for performing ...