Set output delay

The timing report after setting an output delay of 2 ns on output port d using the set output delay command is shown below. The output delay specified on port d implies that the path must account for a delay of 2 ns, external to the Q pin of d reg. In other words, data must arrive 2 ns earlier at the output port d in order to meet timing requirements defined by flip-flops external to the port d. 

DC analyzes any timing path by breaking up the path into a head-to-tail sequence of individual arcs. Hence it considers the path from the latch through the bidirectional cell back to the latch. One must use path segmentation by specifying setjnput delay and set output delay commands. A set output delay or a setjnput delay command at the output of the three-state cell driving the bidirectional port breaks the timing arcs at that point. A set output delay command at an internal pin creates a valid endpoint and a setjnput delay creates a valid start-point. 

There is no constraints on the enable (clock) line since there are no setup requirements on the clock pin. Consider a two step constraint approach using the set output delay and the set max delay commands. The path from the enable pin of the latch to the primary output can be constrained using the set output delay command. The path to the enable pin of the latch can be constrained using the set max delay command. 

The report indicates that the hold check is being performed between edges 0 and 8 of clocks clock and select respectively. Note that when a set output delay command is specified, DC tries to check for both setup and hold. One of the possibilities for such a violation is that the setup check is being done between 0 and 28 edges of clocks clock and select. The hold check from 0 to 8 is equivalent to that between 20 and 28. Hold and setup checks are performed at the same edges at the endpoint, but the hold is moved one cycle from the setup launch edge of the source clock. Hence, the setup check is from 0 to 28 ns. This can be accomplished by the following command ... 

When characterizing a sub-design you get a negative value specified for set output delay for one of my ports. Why ... 

Another apparatus, known as "Test Set Mkl73ModO, developed ca 1949 was described by H.W.L. Street in NOLM 10398. It is described on pp 9-23 to 9-26 and shown in Fig 9-12 of Ref 14 (our Fig 3). The apparatus utilizes the mechanical structure of Test Set Mkl35ModO but also includes an electronic chronograph and appropriate fittings to permit measurements of firing delay times. The app is also equipped with features for comparative heat output... 

You can also set RETOL=0.01. Figure 9.13 shows the waveform results of the breadboard at three different test conditions. The top picture shows the input pulse and the output pulse overlapped so the delay and turn-off ring can be examined. The middle picture shows the input (top) and output (bottom) waveforms when the duty cycle is 5%. The bottom picture shows the input (top) and output (bottom) waveforms when the duty cycle is 95%. 

B gives input AGC, in which the gain and maximum output level are simultaneously adjusted by the volume control but where the input-referred compression threshold is unaffected. A separate trimmer adjustment is normally provided for the compression threshold. Control point A for the volume control gives an example of output AGC, in which the volume control simultaneously adjusts the gain and compression threshold, and a separate trimmer is used to set the maximum output level. Another option is feedforward compression, in which the detector is driven directly by the microphone signal a delay in the amplified signal relative to the control signal can then be used to reduce the attack overshoot in the compression circuit [Verschuure and Dreschler, 1993],... 

Temperature control is normally carried out using thermocouples in a stainless steel pocket. The type of thermocouple used is either a platinum resistance detector (RTD) or a thermocouple using two dissimilar metals that produce a voltage (EMF). The indicators for these thermocouples must match the probe type and grade. The positioning of the probes is very important as well as any lag (delay) in the system. The output from the probe is connected to the indicator and/or controllers. Most indicators have at least a set point with an on/off output. The more advanced units will allow anticipated switching, more than one set point, temperature ramping between temperatures, time, and hold facilities. Thermocouple break and over-temperature alarm outputs are also commonly provided features. 

The pump station consists of two variable-speed pumps. When only one pump is in operation and the output of PC-01 approaches 100%, PSH-03 is actuated and the second pump is started. When both pumps are in operation and the flow drops to 90% of the capacity of a single pump, the second pump is stopped if this condition lasts longer than the setting of TD-04. The purpose of the time delay (TD-04) is to make sure that the pump is not started and stopped too often. 

Figure 11-2. 1 + 1 REMPI, 1 + 1 REMPI and UV absorption spectra of 1,3-DMU [15]. The 1 + 1 REMPI spectrum was obtained by scanning the pump laser and setting the probe laser at 220 nm with a delay time of 10 ns. Neither REMPI spectrum was normalized by the laser power, and at the short wavelength side of the figure, the low output power of the OPO laser resulted in the missing S3 feature in the 1 + 1 spectrum. The absorption spectrum was taken at 140°C, the same temperature as that of the pulsed valve during the REMPI experiments. (Reproduced with permission from J. Phys. Chem. 2004, 108, 943-949. Copyright 2004 American Chemical Society.)...

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