By Courtney Davies

Tricky and compelling, those Celtic designs surround a stunning diversity of knotwork, spirals, key styles, and animal varieties. A wealth of complete- and half-page oblong kinds, motifs, medallions, borders, and nook items are all rendered with beautiful finesse by way of popular Celtic artist Courtney Davis. those undying and evocative designs should be an never-ending resource of principles for artists and architects, either beginner undefined. Courtney Davis works in the most sensible traditions of old Celtic type to provide his personal certain designs. His books near to Celtic artwork contain Celtic Designs and Motifs, The Celtic Stained Glass publication, and The Celtic photo.

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5 THE Q-FLOP In some systems it is useful to know when metastability has resolved. In order to achieve this we can use a metastability filter in a circuit whose ouputs are the same in metastability, and also when the clock is low. 12 This circuit, sometimes known as a Q-flop [12], ensures that half-levels will not appear at the output, and any uncertainty due to metastability appears as a variable delay time from the clock to the output rather than a halflevel. When the clock is low, both outputs are low because both Q L and Q Lbar are high.

Requests from each processor to read from, or write to a particular memory location must not be interrupted by the other, and if the requests are entirely independent, they may occur nearly simultaneously. The design of arbiters, which decide which request to grant are discussed more fully in Part C, but almost all are based on the use of a MUTEX circuit which must distinguish between two closely spaced requests, and metastability is inevitable when the time between requests is very close. Most MUTEX circuits are based on a set reset latch model in which the latch is made from cross-coupled gates, and is followed by a fi lter circuit, which prevents metastable levels reaching the following circuits, and also has the function of signalling when the decision is complete.

The W/L ratio of the transistors in the inverters is crucial here to make low-threshold inverters. Wider n-type transistors and narrow p-type will give a lower than normal threshold, and wider p-types than n-types give a higher threshold. 2, where a high output only appears when there is sufficient difference between the two latch outputs. 2 Latch with metastability fi lter. EFFECTS OF FILTERING 41 half-level. 13 where both outputs go up and down in phase. Only when they diverge can an output appear from the filter.

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