By Eby G. Friedman, Ivan S. Kourtev, Baris Taskin
This ebook information timing research and optimization concepts for circuits with level-sensitive reminiscence parts. It incorporates a linear programming formula acceptable to the timing research of enormous scale circuits and features a hold up insertion method that improves the potency of clock skew scheduling. insurance additionally offers a framework for and effects from enforcing timing optimization algorithms in a parallel computing setting.
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Extra info for Timing Optimization Through Clock Skew Scheduling
Example text
Note that for a negative latch, the leading edge is a high-to-low transition and the trailing edge is a low-to-high transition. 4. The exact relationships among signals on the terminals of a register can be presented and evaluated in analytical form [61, 62, 63]. In this research monograph, however, registers are considered at a higher level of abstraction in order to hide the unnecessary details of the specific electrical implementation. The latch delay parameters described in the following sections are therefore considered from the perspective of the earlier discussion of delay in Chapter 3.
2—the output of the latch is typically labeled Q. 3. Data Input D Clock Input C Q Data Output Fig. 2. Schematic representation of a level-sensitive register or latch. 3 is a positive-polarity2 latch since it is transparent during that portion of the clock period during which C is high. 1. 1. Operation of the positive-polarity D latch. , C = 1 ⇒ Q = D. 3. When the clock signal C changes from 1 to 0, the current value of D is stored in the register and the output Q remains fixed to that value regardless of whether the data signal D changes.
1 Width of the Clock Pulse F The width of the clock pulse CW is the permissible width of the time interval between the latching edge and non-latching edge of the clock signal. The superscript F is used optionally to represent the type of registers—flip-flops in this case—that are synchronized by this clock signal. 5 Parameters of Flip-Flops 49 used to represent the width, which is included to distinguish between a clock F = t6 − t3 signal C and the clock width CW . 7 and is defined as the interval between the latching and non-latching edges of the clock pulse such that the flip-flop will operate F will not affect the values of the setup time δSF correctly.