Download Hardware Design and Simulation in VAL/VHDL by Larry M. Augustin, David C. Luckham, Benoit A. Gennart, Youm PDF

By Larry M. Augustin, David C. Luckham, Benoit A. Gennart, Youm Huh, A. Stanculescu

The VHSIC Description Language (VHDL) offers a customary laptop processable notation for describing undefined. VHDL is the results of a collaborative attempt among IBM, Intermetrics, and Texas tools; backed through the Very excessive velocity built-in Cir­ cuits (VHSIC) software place of work of the dept of security, starting in 1981. this present day it really is an IEEE average (1076-1987), and several other simulators and different automatic aid instruments for it can be found commercially. through offering a customary notation for describing undefined, specially within the early levels of the layout strategy, VHDL is predicted to minimize either the time lag and the fee all in favour of development new structures and upgrading current ones. VHDL is the results of an evolutionary method of language devel­ opment beginning with excessive point description languages present in 1981. It has a decidedly programming language taste, ensuing either from the orientation of languages of that point, and from a ma­ jor requirement that VHDL use Ada constructs anywhere acceptable. in the course of the 1980's there was an expanding present of analysis into excessive point specification languages for structures, quite within the software program quarter, and new equipment of using requisites in structures de­ velopment. This task is around the world and comprises, for instance, item­ orientated layout, a number of rigorous improvement equipment, mathematical verification, and synthesis from excessive point standards. VAL (VHDL Annotation Language) is an easy extra step within the evolution of description languages towards utilizing new equipment that experience built given that VHDL was once designed.

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Extra resources for Hardware Design and Simulation in VAL/VHDL

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The condition assumed must be statically checkable at elaboration time. 4. The delay time through the device should be less than or equal to the hold time, otherwise the output of the device would have to change to a new value (after the delay time) before the stability requirement on the input (the hold time) was met. Clearly such a device is non-causal, and this will become more apparent when we specify the timing behavior of the flip-flop. e --I report "Error in generic constant"; If an instance of the D flip-flop is instantiated that violates this condition, a warning message ("Error in generic constant") will be issued.

When an event is projected under the transport delay model, it preempts all events previously scheduled on the signal for that time and all future times. That is, the events are removed from the simulation queue and the simulation behaves as if they had never been projected. We shall refer to this as forward preemption. 3 shows a sample input waveform and the corresponding output waveform. Arrows from the input to the output waveform indicate the projected and preempted events. T + t + 14 fs. 3: Transport Delay Buffer.

When input changes to '1' at time T, an event '1' is projected on output at time T + 10 fs. If input changes back to CHAPTER 3. TIMING MODELS 48 '0' t time units later, then an event '0' is projected on output at time Thus a positive input pulse becomes longer. When input changes to '0' at time T, an event (, 0') is projected on output at time T + 14 fs. If input changes back to '1' t time units later, then an event (, 1') is projected on output at time T + t + 10 fs. Thus a negative input pulse becomes shorter.

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