Falling edge

The primary purpose of this filter is to add a delay to a pulse or data sequence. The use of the RC time constant allows this delay to be added to both the rising and the falling edge of the pulse. The ideal response... 

Figure 60 The EL decay at the falling edge of a 25 V pulse plotted in against time scale to compare with the bimolecular kinetics behavior. Here, t = 0 corresponds to the voltage fall of the pulse. The data are fitted (full straight line) to the function expressed by Eq. (166). The el( ) decay curve is shown in the inset for comparison. After Ref. 309. Copyright 1998 American Institute of Physics.

The semantics of the always statement implies that all statements in are to be executed only when a rising edge or a falling edge of clock occurs. We shall call this special always statement as a clocked always statement. 

The assignment to output Zee occurs only at the falling edge of the clock. Variable Zee is inferred to be a falling-edge-triggered flip-flop. The flip-flop shown in the figure has a data-select, that is, the input Control selects either A or B as the data for the flip-flop. 

Figure 2-47 Falling-edge-triggered flip-flops inferred.

The variable Counter is assigned under the control of a falling edge of clock ClockB. Thus, two falling-edge-triggered flip-flops are synthesized for Counter. 

If a falling-edge-triggered flip-flop are to be inferred, then the clock edge event posedge Clk needs to be replaced by ... 

In this case, falling-edge-triggered flip-flops are inferred for variable Temp, in addition to those for NextState. 

Since NextState is assigned a value under the control of a clock edge (Stmt C) and it is also assigned asynchronously (Stmt A and B), a falling-edge-triggered flip-flop with asynchronous preset and clear is synthesized. This is shown in Figure 2-53. Note that four flip-flops are required. The first flip-flop (the leftmost bit of NextState) has both asynchronous preset and clear terminals since it needs to be preset on Reset and cleared on Set. Similarly, the fourth flip-flop has both asynchronous preset and clear terminals since it needs to be preset on Set and cleared on Reset. The... 

Here is a model that detects three l s in a data stream appearing on input Data. The input is checked on every falling edge of clock. If three consecutive 1 s are found on the input, the output is set to true, else it is set to false. 

Figure 5 shows the ratio of trapped to ionized population for several peak intensities and three pulse widths. This ratio is close to zero for peak intensities ( peai) less than I s, as expected. For > Ires the ratio grows, and can be as much as one half. The trapped population is found mostly in states with / > 4 and quantum numbers > 7. Longer pulse widths result in more excitation and ionization, but a lower overall trapped/ionized ratio. Eventually, as the peak intensity is raised and the channel closing occurs earlier in the pulse, the ratio decreases since most of the ionization then occurs non-resonantly. The structure in the curves may be indicative of interference between resonant excitation on the rising and falling edges of the pulse, a subject we will return to in the next section. 

Direct Rambus A memory bus that transfers data at 800MHz over a 16-bit memory bus. Direct Rambus memory models (often called RIMMs), like DDR SDRAM, can transfer data on both the rising and falling edges of a clock cycle. 

The function /, describing the relationship between concentration and delay time t, is dependent on the dispersion process taking place in the FIA channel and, therefore, on channel geometry, volume, and flow velocity. In the simplest case, that is, absence of chemical reactions, and when the flow channel conforms with the model of one well-stirred tank (cf. Chapter 3), the concentration-time matrix of the falling edge of the curve is described by ... 

Regardless of which types of titrations will be performed in the FIA mode, the sudden change of slope at the rising and falling edge of the recorded peak will be much more pronounced than the slopes observed in simple peak-width measurement, since all correctly performed titra-... 

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