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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?
Why can the 68010, the 68020, etc., be used to design virtual memory systems? How does the PMMU avoid the need for a vast number of page descriptors?
Describe how the 68451 MMU translates logical addresses into physical addresses. List the advantages and disadvantages of 68451's approach to memory management.
What are the main objectives of a memory management system? What is the difference between logical and physical address space?
What are the fundamental differences between EPROM, flash EEPROM, and E 2 PROM?
What are the criteria by which address decoders are judged? What does primary address range mean when it is applied to a system using partial address decoding?
A 68000 system is to have up to eight 512 K-word pages of read/write memory, up to eight 16 K-word pages of EPROM. Design an arrangement that will do this.
What is meant by the terms partial address decoding and full address decoding? What, if any, are the dangers inherent with this system?
Can you think of any way of overcoming the restriction that a block of memory should be mapped onto a boundary equal to its own size?
Design an address decoder for the following 68000 system: 256 Kbytes of ROM (using 128K x 8-bit chips) and 4 Mbytes of RAM1 (using 512K x 4-bit chips).
Assume that we are using a 68000-based system. What 68000 address lines are required to address each of the memory blocks in Ql?