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Under the and later, this was made privileged, to better support virtualization software. The added many improvements over the including a bit arithmetic logic unit ALUbit external data and address buses, extra instructions and additional addressing modes. To avoid problems with returns from coprocessor, bus 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.
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The has a coprocessor interface supporting up to eight coprocessors. The replaced this with a proper instruction cache of bytes, the first 68k series processor to feature true on-chip cache memory.
A lower cost version was also made available, known as the 68EC In a multiprocessor system, coprocessors could not be shared between CPUs. Wikimedia Commons has media related to Motorola The had bit internal and external data and address buses, compared to the early x0 models with bit data and bit address buses. This page was last edited on 5 Septemberat dahasheet The HP, and also use thetogether with a math coprocessor.
This article needs additional citations for verification. Fixed branch prediction, branch-never-taken approach .
MC Datasheet(PDF) – Motorola, Inc
The Motorola ” sixty-eight-oh-twenty “, ” sixty-eight-oh-two-oh ” or ” six-eight-oh-two-oh ” is a bit microprocessor from Motorolareleased in 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.
The Nortel Networks DMS telephone central office switch also used the as the first microprocessor of the SuperNode computing core. Naturally, unaligned accesses were slower than aligned accesses because they required an extra memory access. The coprocessor interface is asynchronous, so it is possible to run the coprocessors at a different clock rate than the CPU.
Unsourced material may be challenged and removed. The and had a proper three-stage pipeline. The 68EC lowered cost through a bit address bus.
This article is based on material taken from the Free On-line Dictionary of Computing prior to 1 November and incorporated under the “relicensing” terms of the GFDLversion 1.
Motorola-Freescale-NXP processors and microcontrollers. For more information on the instructions and architecture see Motorola 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 resulting decrease in bus traffic was particularly important in systems relying heavily on DMA.
The new addressing modes added scaled indexing and another level of indirection to many of the pre-existing modes, and added quite a bit of flexibility to various indexing modes and operations. The had a small byte direct-mapped instruction cache, arranged as 64 four-byte entries. Retrieved from ” https: In other projects Wikimedia Commons.
Although small, it still made a significant difference in the performance of many applications. The had no alignment restrictions on data access. All other processors had to hold off memory accesses until the cycle was complete. Fundamentals of Digital Logic and Microcomputer Design. Please help improve this article by adding citations to reliable sources. It is also the processor used on board TGV trains to decode signalling information which is sent to the trains through the rails.
The UX shipped with Amiga Unix, requiring an ‘ or ‘ processor. The previous and processors could only access word bit and long word bit data in memory if it were word-aligned located at an even address.
Multiprocessing support was implemented externally by the use of a RMC pin  to indicate an indivisible read-modify-write cycle in progress. Datsheet Learn how and when to remove this template message. The main CPU recognizes “F-line” vatasheet with the four most significant opcode bits all oneand uses special bus cycles to interact with a coprocessor to execute these instructions.
It is the successor to the Motorola and is succeeded by the Motorola