Circuit Design with VHDL [Volnei A. Pedroni] on *FREE* shipping on qualifying offers. This textbook teaches VHDL using system examples. Editorial Reviews. Review. Volnei Pedroni explains what designers really need to know to build hardware with VHDL. This book sets the standard for how. While other textbooks concentrate only on language features, Circuit Design with VHDL offers a fully integrated presentation of VHDL and design concepts by.

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Documents Flashcards Grammar checker. Code Structure Problem 2. Physical circuits and operation of multiplexers are described in chapter 11 of [1]. Data Types Problem 3. Dealing with data vdl Solution: First, recall figure 3. From it, we conclude the following for the signals listed in Problem 3. Since y is 2D, some older compilers might not accept the vector-like assignments above, thus requiring the assignment to be made element by element with GENERATE, for example.

The assignment below is legal too. Physical circuits and operation of ROM memories are described in chapter 17 of [1]. Operators and Attributes Problem 4. Physical circuits and operation of decoders are described in chapter 11 of [1].

Pedroni, MIT Press, x: Concurrent Code Problem 5. Generic multiplexer Solution 1: For generic n and fixed m Physical circuits and operation of multiplexers are described in chapter 11 of [1]. For n and m generic Package: Priority encoder Solution for part ghdl See a generic implementation in the solution of Problem 6. Pedroni, MIT Press, Physical circuits and operation of adders are described in chapters 3 and 12 of [1].

Simulation results are included after the code. Binary-to-Gray code converter Solution: Gray code is described in chapter 2 of [1]. The figure below shows two approaches to solve this problem.

In aa circuit is used to generate the Gray code corresponding to the conventional binary word presented at its input. Since the problem asks for a generic solution that is, for any number of bits, Napproach a will be employed. See vhddl question for the reader at the end of this exercise. Question regarding the solution above: Three equivalent equations were presented to calculate Gray words from regular binary words.

Check in the package standard which data types are supported by the shift operators. Physical circuits and operation of comparators are described in chapter 12 of [1]. The glitches at some of the state transitions are absolutely normal. Sequential Code Problem 6.

### Circuit Design and Simulation with VHDL by Volnei A. Pedroni

Priority encoder Solution 1: Non-generic Two solutions are presented for part a. The latter is obviously recommended. Simulation results are also included. Generic frequency divider Solution: Physical circuits and operation of frequency dividers are described in chapters 14 and 15 of [1]. Pedroni, MIT Press, count: Physical circuits and operation of timers are described in chapter 14 of [1]. In the voonei below, the problem was modified slightly: A little portion of the experimental results is included after the code below.

vbdl

## Circuit Design and Simulation with VHDL by Volnei A. Pedroni (Hardback, 2010)

Physical circuits and operation of parity detectors are described in chapter 11 of [1]. The solution below, using sequential code, is fine for any number of bits N. Simulation results are also presented.

See the code below. Physical circuits and operation of all types of flip-flops are described in chapter 13 of [1]. A truly D-type flip-flop with asynchronous reset same as in Example 6. Only the clock appears in the sensitivity list, causing the reset to be synchronous.

Consequently, to avoid mistakes, explicitly writing the test is advisable. Here the contents of sections 6.

## Circuit Design with VHDL Problem Solutions (*)

Notice that no signal assignment is made at the transition of another signal, signifying that, in principle, no flip-flop is wanted probably a combinational circuit. The situation here is even more awkward than that above. Besides generating desiggn a latch, the value of d also causes the process to be run. The result is a circuit very unlikely to be of any interest. Signals and Variable Problem 7. Physical pedrono and operation of data delays using shift registers are described in chapter 14 of [1].

Generic address decoder Solution: State Machines Problem 8. Signal generator 1 Solution: Physical circuits, design, and operation of finite state machines are described in chapter 15 of [1]. The solution that follows is based on the arbitrary signal generator design technique introduced there. The corresponding signals are depicted in the figure below.

In this exercise, out1 is very simple to generate, because all of its transitions are at the same clock edge positive. However, the same is not ciruit for out2, which contains transitions at both clock edges. Coincidently, the shape of out2 in this exercise is not subject to glitches during signal construction, so to better illustrate the use of such that technique a slight modification will be introduced see the waveform right below clk in the figure above.

Observe that now x is subject to glitches, making the problem a more general case. Two FSMs are employed to create the desired signal, each associated with a multiplexer. The states for both machines are called A, B, C, and D.

A corresponding VHDL code is shown below, followed by simulation results. Observe in the latter the expected glitches in x, which disappear in y. Signal generator of Problem 8. Circuif circuits, design, and operation of sequential circuits are described in chapter 14 of [1]. The solution that follows is based on the theory presented there.

### Circuit Design with VHDL Problem Solutions (*)

In this case see figure abovethree auxiliary signals a, b, c are created, from which out1 and out2 are then derived using conventional gates. As described in chapter 14 of [1], the fundamental point here is to guarantee that the outputs are not prone to glitches. To guarantee vhd, outputs, all three auxiliary cidcuit are registered i.

A corresponding VHDL follows, along with simulation results. IN BIT; out1, out2: Additional Golnei Designs Problem 9. Serial data transmitter Solution: A typical way of solving this kind of problem is to store the data vector into a shift register when the data is ready, of course and then shift the values out sequentially. The general data structure is then that shown in the figure below.

Packages and Components Problem Carry-ripple adder constructed with components Solution: A VHDL code for this exercise is shown below. Further wiith, including its physical implementation and other adder architectures can be seen in [1] chapters 12, 19, and IN BIT; s, cout: Note that in the solution below the function was volbei in the main code; to install it in a package, just follow the instruction in chapter 11 see example Additional System Designs Problem General-purpose FIR filter Solution: A block diagram for this circuit is shown below.

It contains two shift registers, vvolnei store the input values x and the filter coefficients c. It contains also a register to store the accumulated acc value, producing the filter output y.

The total number of taps is n, with m bits used to represent x and c, and 2m bits for the aftermultiplication paths. Note that the code includes overflow check. Unit 4 Exam- Study Guide.