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Additional resources for 68000, 68010, 68020 Primer
The MPU can then carry out its next instruction. Recall that the data being moved around is represented by fast bursts or pulses (O's and 1's) synchronized by the system clock. When we talk of read and write cycles, these are defi nite periods of time related to the speed of the system clock. SUMMARY OF SYSTEM BUS The system bus links the main units of the computer, providing an electrical path between MPU, memory and Va. It carries three types of signals: data, address and control. orks. Although MPUs have evolved into myriad designs, there is a useful "generic" architecture that serves to describe them all.
On decoding the address, the VM system VJoldd calculate (by table lookup perhaps) its equivalent page number. oenient chunk of memory, say 1 K-byte. ly. he page from disk 10 RAM , swapping out an unwanted page if necessary. Basic Microprocessor Concepls Ad dr ess Sp ac e 35 RAM update table swap out old page TABLE location Address x N y M Fig. 1-14 page lault RAM Virtual Memo ry Chapters 7 and 8 will discuss virtual memory in more detail, as implemented on the MC68010 and MC68020. RAM DtSK The opposite to VM is the RAM disk.
The advantages are the security and speed that arise from the use of short 16-bit addresses. The disadvantage is the overhead involved in checking and adding the segment identifiers. LINEAR MEMORY AND THE MMU (MEMORY MANAGEMENT UNIT) In the linear approach the programmer looks on memory as one long continuous addressing space from zero to the maximum possible address, addressed by means of a single number. With the 20- to 32-bit address widths available on the M68000, this represents a generous chunk (from 1 M· byte to 4 G ·bytes) to play with.