<p>For multi-format video codecs, implementing dynamic clock gating can further enhance power consumption. By detecting the formats being used, the feature completely shuts down the blocks reducing their dynamic power consumption to absolute zero. Dynamic clock gating can reduce power consumption an additional 30% after automatic clock gating has been applied.</p>

A PLL has a low-pass transfer function. It will track low-speed variations in the input clock, but cannot faithfully track variations at frequencies above its bandwidth. In other words, there can be variations in the phase relationship between the PLL input and output. Any PLL that receives a spread spectrum clock should therefore be checked for spread spectrum compatibility. In a worst-case scenario, a narrow-band or marginally stable PLL may have difficulty maintaining lock if there is too much variation in the input clock. A more likely failure scenario is that the PLL tracking error leads to timing problems in the associated circuitry. Keep in mind, however, that there are many applications with PLLs that are not adversely affected by a spread spectrum clock.

The data type (e.g., bit , logic ) of the signal is not dependent on the context in which it is used, hence the model can evolve from system to RTL to gate level without changing the data type of the signals used.

DW-09-13-S-D-830_Datasheet PDF

#4 – Concise hierarchy connections Implicit port connections reduce the redundant nature of listing a name twice for each named port connection when the port name matches the variable name that is connected to the port. With a careful naming convention, instantiating large logic blocks into a higher level module will be less tedious by using SystemVerilog .name implicit port connections. When using the .name implicit port connection technique, any sub-block port that does not match in size or name to the module net or bus connected to the port, must be connected using a named-port connection.

SystemVerilog introduces the capability to instantiate modules with highly abbreviated (.*) implicit port connections . Implicit (.*) port connections are intended to facilitate the process of instantiating large sub-blocks into upper-level modules without having to type multiple lines of named port connections where the sub-blocks are instantiated.

Note: Since the (.*) implicit port connections style reduces the self-documentation and debugging capability of a tool, it is not recommended by the authors.

DW-09-13-S-D-830_Datasheet PDF

Step 2: Add built-in checks to avoid synthesis-simulation mismatch One significant design issue exposed during the verification phase is simulation synthesis mismatch.” SystemVerilog fulfils the needs of designer's to specify assertions that allow tools to verify that the designer's assumptions and intent are in alignment with his synthesized design, reducing the likelihood that the schedule will have to slip at the last moment.

DW-09-13-S-D-830_Datasheet PDF

Following are five built-in lint checks that can be used by HDL designers:

#1 – SystemVerilog specialized always blocks The Verilog always construct provides a general-purpose application of a procedural block and – as a result – the design intent was not apparent. SystemVerilog adds new forms of always blocks to allow engineers to specify their design intent in a way that tools can verify.

Figure 1.49 The effect of adding several non-harmonically related sine waves together.

Here the square wave example discussed earlier has had four more sine waves added to it. However, these sine waves are between the harmonics of the square wave and so are unrelated to the period, but they do start off in phase with the harmonics. The effect of these other components is to start cancelling out the repeat periods of the square waves, because they are not related in frequency to them.

By adding more components which sit in between the harmonics, this cancellation of the repeats becomes more effective so that when in the limit, the whole space between the harmonics is filled with sine wave components of the appropriate amplitude and phase. These extra components will add constructively only at the beginning of the waveform and will interfere with successive cycles due to their different frequencies. Therefore, in this case, only one square wave will exist.

Thus the main difference between the spectrum of periodic and aperiodic waveforms is that periodic waveforms have discrete partials, which can be represented as lines in the spectrum with a spacing which is inversely proportional to the period of the waveform. Aperiodic waveforms by contrast will have a spectrum which is continuous and therefore does not have any discrete components. However, the envelope of the component amplitudes as a function of frequency will be the same for both periodic and aperiodic waves of the same shape, as shown in Figure 1.50. Figure 3.6 in Chapter 3 shows the aperiodic waveform and spectrum of a brushed snare.


Pt = Transmitted power Atg = Gain for transmitter antenna Arg = Gain for receiving antenna Pmin = Minimum received signal strength

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