By Thucydides Xanthopoulos (auth.), Thucydides Xanthopoulos (eds.)
Clocking in sleek VLSI Systems covers a variety of topics relating to microprocessor clocking together with distribution, flop layout, inductive concepts, section noise and jitter, hold up lock strategies, resiliency and different ideas to deal with strategy edition and actual layout points. The ebook comprises rigorous analytical remedy for a couple of vital issues equivalent to timing uncertainty due statistical spatial and temporal phenomena, metastability, jitter within the time and frequency area and supply-induced clock noise. It additionally encompasses a huge variety of layout examples and case reviews, history info, an entire record of references and a couple of complex subject matters. the themes lined replicate to a wide quantity the collective pursuits and foci of either and academia with appreciate to clocking. it's very up to date and co-authored through a panel of specialists all in favour of clock layout in significant processor chips.
Clocking in smooth VLSI Systems is authored from a powerful layout point of view and may aid readers drawn to clock layout receive the mandatory history details and instruments for the sort of job. The booklet additionally captures layout developments that experience seemed during the last few years and gives a accomplished checklist of references for extra study.
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Additional resources for Clocking in modern VLSI systems
The processor has two cores operating at the high frequency MCLK. The uncore is supported by the SCLK at half the MCLK frequency and the ZCLK dedicated for the I/O circuits at 4 times the system clock frequency. Binary trees embedded in the horizontal and vertical clock spines in the uncore distribute the clocks to the SCLK and ZCLK grids. The core employs the recombinant tile clock distribution similar to that described in . Operational flexibility is achieved by keeping core and uncore clock regions independent.
Loading variations (mismatch) at the intermediate or final stage of the clock distribution Design mismatches arise because of a number of factors. For example, a nonbalanced clock distribution may be necessary due to floorplan constraints. A poorly chosen distribution topology could lead to structural design mismatches. In other situations, the clock arrival times at certain receivers are intentionally skewed to facilitate time 2 Modern Clock Distribution Systems 15 borrowing across sequential boundaries due to nonuniform data path lengths.
40) are located at the top and bottom of grid. 40). The purpose of the reference clock is to act as the reference to deskew the global clock. 41 shows the details of the deskew buffer architecture and the delay circuit design. The delay circuit design is similar to the previous design consisting of two inverter stages with switchable capacitor loads using a 20b thermometer code with a tri-state controllable output stage. In this implementation, the total skew is 28ps with deskew turned on. The skew increases by a factor of 4 with the deskew mechanism disabled.