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All other processors had to hold off memory accesses until the cycle was complete. The Nortel Networks DMS telephone central office switch also used the as the first microprocessor of the SuperNode computing core.

MC Datasheet(PDF) – Motorola, Inc

The resulting decrease in bus traffic was particularly important in systems relying heavily on DMA. The had no alignment restrictions on data access. For more information on the instructions and architecture see Motorola Although small, it still made a significant difference in the performance of many applications.

The replaced this with a proper instruction cache of bytes, the first 68k series processor to feature true on-chip cache memory. Views Read Edit View history.

In a multiprocessor system, coprocessors could not be shared between CPUs.


Naturally, unaligned accesses were slower than aligned accesses because they required an extra memory datashheet. The 68EC lowered cost through a bit address bus.


Motorola-Freescale-NXP processors and microcontrollers. A lower cost version was also made available, known as the 68EC PGA pins used Though it was not intended, these new modes made the very suitable for page printing; most laser printers in the early s had a 68EC at their core. Under the and later, this was made privileged, to better support virtualization software. dataxheet

By using this site, you agree to the Terms of Use and Privacy Policy. Retrieved from ” https: The UX shipped with Amiga Unix, requiring an ‘ or ‘ processor. To avoid problems with returns from coprocessor, datasueet error, and address error exceptions, it was generally necessary in a multiprocessor system for all CPUs to be the same model, and for all FPUs to be the same model as well.

It is further being used in the flight control and radar systems of the Eurofighter Typhoon combat aircraft. The 68EC is a lower cost version of the Motorola The has a coprocessor interface supporting up to eight coprocessors.

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Fixed branch prediction, branch-never-taken approach [15]. From Wikipedia, the free encyclopedia. Fundamentals of Digital Logic and Microcomputer Design.


The added many improvements over the including a bit arithmetic logic unit ALUbit external data and address buses, extra instructions and additional addressing modes.

The had bit internal and external data and address buses, compared to the dztasheet x0 models with bit data and bit address buses. InRochester Electronics has re-established manufacturing capability for the microprocessor and it is still available today. It is also the processor used on board TGV trains to decode signalling information which is sent to the trains through the rails.

In keeping with naming practices common to Motorola designs, the is usually referred to as the “”, pronounced “oh-two-oh” or “oh-twenty”.

Motorola 68020

While the had ‘supervisor mode’, it did not meet the Popek and Goldberg virtualization requirements due to the single instruction ‘MOVE from SR’ being unprivileged but sensitive.

The ‘s ALU was also natively bit, so could perform bit operations in one clock, whereas the took two clocks minimum due to its bit ALU. The and had a proper three-stage pipeline.