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What can the designer do to overcome these difficulties? What is the probability of failure in a 16-Mbyte memory system over a period of 48 hours?
What are the differences between the 68020 and 68030's ISP and MSP? Explain the meaning of a throwaway stack and describe how it is employed.
What are the format and the vector offset stored in word four of a 68020 stack frame and how are they used (either by the 68000 itself or by the programmer)?
Describe the breakpoint exception and explain how its implementation differs in the 68010 and the 68020/30 microprocessors.
Write the code to copy the longword pointed at by AO in user data space to the location pointed at by Al into user program space.
What is the reflection coefficient for a bus with a characteristic impedance of 75 U and a termination of 200 fl? What is meant by active termination?
Derive a general expression for the maximum rate (bits per second) at which a bus can operate stating any assumptions you make.
Why are address and data bus buffers required to implement a bussed system? What is the significance of the term noise immunity when applied to a logic element?
Describe how bit-stuffing is employed by synchronous serial data links to ensure data transparency.
What additional functionality does the DUART have in comparison with the ACTA? What is the difference between the DUART's local and remote loopback modes?
What is maximum permitted burst length if designer cater for maximum frequency error between transmitter and receiver clocks of 80 percent of stated worst case?
The control register of a 6850 ACIA is loaded with the value $135. Define the operating characteristics of the ACIA resulting from this value.
Describe the electrical characteristics of IEEE bus signals. In the context of the IEEE bus. what are primary and secondary addresses, and how are they used?
What three groups of signals compose the IEEE bus, and what is the difference between these groups?
Write a program to set up the PITT as a real-time clock with a frequency of 50 Hz. Assume that the system clock runs at 10 MHz.
Write an initialization routine to set up a 68230 Pirr with port A as an 8-bit double-buffered input port and port B as an 8-bit double-buffered output port.
Design a suitable interface between a computer and the printer using a 68230 PVT, and write a program to control the PUT.
Design a simple, single-channel DMA controller for the 68000 using SSI and MSI logic. The DMAC has a two-wire interface to the peripheral, consisting of REQ*.
In what way is the 68040 a radical departure from the 68020 and the 68030? In what way is the 68060 a radical departure from the 68040?
How does a coprocessor recognize a 68020 access? The 68040's approach to bus arbitration differs from that of the 68000 to the 68030. In what way?
Why is it much harder to design a data cache than an instruction cache? To what extent do the 68020's instruction cache and the 68030's instruction.
what must the value of h be to achieve this? assume that the main store access time is 150 ns and that the cache access time is 30?
Why is the performance of the direct-mapped cache much worse than that of a fully associative cache under certain circumstances?
How would you program the PMMU's TC register to implement a two-level page system with a page size of 8 Kbytes and a 30-bit logical address?
Why are both these descriptors available in long and short forms, and what effect does this have on the address translation process?