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amulet

[am-yuh-lit] /ˈæm yə lɪt/
noun
1.
a small object worn to ward off evil, harm, or illness or to bring good fortune; protecting charm.
Origin
1595-1605
1595-1605; (< Middle French amulete) < Latin amulētum
Synonyms
talisman.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for amulet
  • Soon, customers would ask her to mount a newly bought amulet to wear.
  • Around his neck is a piece of twisted brown fabric, an amulet.
  • As a bridal gift, it serves as an amulet of protection from harm.
  • Now he was eyeing a necklace with a green stone amulet.
  • The other thing you can do is take with you an amulet.
  • Afterwards they claimed their apparently bare rooms had filled with jinn seeking favours or release from amulet charms.
  • He told him to wear it as an amulet round his neck, to ensure that all was well.
British Dictionary definitions for amulet

amulet

/ˈæmjʊlɪt/
noun
1.
a trinket or piece of jewellery worn as a protection against evil; charm
Word Origin
C17: from Latin amulētum, of unknown origin
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for amulet
n.

mid-15c., amalettys, from Latin amuletum (Pliny) "thing worn as a charm against spells, disease, etc.," of uncertain origin, perhaps related to amoliri "to avert, to carry away, remove." Not recorded again in English until c.1600; the 15c. use may be via French.

Online Etymology Dictionary, © 2010 Douglas Harper
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amulet in Technology
processor
An implementation or the Advanced RISC Machine microprocessor architecture using the micropipeline design style. In April 1994 the Amulet group in the Computer Science department of Manchester University took delivery of the AMULET1 microprocessor. This was their first large scale asynchronous circuit and the world's first implementation of a commercial microprocessor architecture (ARM) in asynchronous logic.
Work was begun at the end of 1990 and the design despatched for fabrication in February 1993. The primary intent was to demonstrate that an asynchronous microprocessor can consume less power than a synchronous design.
The design incorporates a number of concurrent units which cooperate to give instruction level compatibility with the existing synchronous part. These include an Address unit, which autonomously generates instruction fetch requests and interleaves (nondeterministically) data requests from the Execution unit; a Register file which supplies operands, queues write destinations and handles data dependencies; an Execution unit which includes a multiplier, a shifter and an ALU with data-dependent delay; a Data interface which performs byte extraction and alignment and includes an instruction prefetch buffer, and a control path which performs instruction decode. These units only synchronise to exchange data.
The design demonstrates that all the usual problems of processor design can be solved in this asynchronous framework: backward instruction set compatibility, interrupts and exact exceptions for memory faults are all covered. It also demonstrates some unusual behaviour, for instance nondeterministic prefetch depth beyond a branch instruction (though the instructions which actually get executed are, of course, deterministic). There are some unusual problems for compiler optimisation, as the metric which must be used to compare alternative code sequences is continuous rather than discrete, and the nondeterminism in external behaviour must also be taken into account.
The chip was designed using a mixture of custom datapath and compiled control logic elements, as was the synchronous ARM. The fabrication technology is the same as that used for one version of the synchronous part, reducing the number of variables when comparing the two parts.
Two silicon implementations have been received and preliminary measurements have been taken from these. The first is a 0.7um process and has achieved about 28 kDhrystones running the standard benchmark program. The other is a 1 um implementation and achieves about 20 kDhrystones. For the faster of the parts this is equivalent to a synchronous ARM6 clocked at around 20MHz; in the case of AMULET1 it is likely that this speed is limited by the memory system cycle time (just over 50ns) rather than the processor chip itself.
A fair comparison of devices at the same geometries gives the AMULET1 performance as about 70% of that of an ARM6 running at 20MHz. Its power consumption is very similar to that of the ARM6; the AMULET1 therefore delivers about 80 MIPS/W (compared with around 120 from a 20MHz ARM6). Multiplication is several times faster on the AMULET1 owing to the inclusion of a specialised asynchronous multiplier. This performance is reasonable considering that the AMULET1 is a first generation part, whereas the synchronous ARM has undergone several design iterations. AMULET2 (currently under development) is expected to be three times faster than AMULET1 - 120 kdhrystones - and use less power.
The macrocell size (without pad ring) is 5.5 mm by 4.5 mm on a 1 micron CMOS process, which is about twice the area of the synchronous part. Some of the increase can be attributed to the more sophisticated organisation of the new part: it has a deeper pipeline than the clocked version and it supports multiple outstanding memory requests; there is also specialised circuitry to increase the multiplication speed. Although there is undoubtedly some overhead attributable to the asynchronous control logic, this is estimated to be closer to 20% than to the 100% suggested by the direct comparison.
AMULET1 is code compatible with ARM6 and is so is capable of running existing binaries without modification. The implementation also includes features such as interrupts and memory aborts.
The work was part of a broad ESPRIT funded investigation into low-power technologies within the European Open Microprocessor systems Initiative (OMI) programme, where there is interest in low-power techniques both for portable equipment and (in the longer term) to alleviate the problems of the increasingly high dissipation of high-performance chips. This initial investigation into the role asynchronous logic might play has now demonstrated that asynchronous techniques can be applied to problems of the scale of a complete microprocessor.
(http://cs.man.ac.uk/amulet).
(1994-12-08)
The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Encyclopedia Article for amulet

an object, either natural or man-made, believed to be endowed with special powers to protect or bring good fortune. Amulets are carried on the person or kept in the place that is the desired sphere of influence-e.g., on a roof or in a field. The terms amulet and talisman are often used interchangeably, but a talisman is sometimes defined as an engraved amulet.

Learn more about amulet with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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