By M. Morris Mano
This can be a glossy revision of the vintage electronic layout textbook. The booklet teaches the elemental instruments for the layout of electronic circuits in a transparent, simply obtainable demeanour. New to This version: *Nine sections on Verilog Description Language (HDL) inserted in discrete sections, permitting the cloth to be lined or skipped as wanted. The Verilog HDL presentation is at an appropriate point for starting scholars who're studying electronic circuits for the 1st time. *Reorganized fabric on combinational circuits is now lined in one bankruptcy. *The emphasis within the sequential circuits chapters is now on layout with D flip-flops rather than JK and SR flip-flops. *The fabric on reminiscence and programmable good judgment is now consolidated in a single bankruptcy. *Chapter eight is composed usually of latest fabric and now covers electronic layout within the sign in move point (P) FL), getting ready the reader for extra complicated layout tasks and extra Verilog HDL experiences. *A new part in bankruptcy eleven supplementations the laboratory experiments with HDL experiments. those not able the reader to ascertain the circuits designed within the laboratory through parts and/or through HDL simulation.* textual content followed through Verilog simulator software-SynaptiCAD's VeriLogger seasoned review model, a Verilog simulation atmosphere that mixes the entire positive aspects of a standard Verilog simulator with a robust graphical try out vector generator. quickly version checking out in VeriLogger seasoned permits the reader to accomplish bottom-up checking out of each version in a layout. the entire HDL examples within the ebook are available at the CD-ROM. *A significant other web site contains assets for teachers and scholars equivalent to transparency masters of all figures within the booklet, all HDL code examples from the booklet, a Verilog educational, tutorials on utilizing the VeriLogger seasoned software program, and extra. it may be chanced on at http://www.prenhall.com/mano
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Extra resources for Digital Design (3rd Edition)
Its value is not changed until the process has completed execution of all sequential statements contained in the process. In fact, if signal b is a ‘1’ value, then whatever garbage value the signal had when entering the process will have the value 2 added to it. A better way to implement this example is shown in the next example. The only difference between the next model and the previous one is the declaration of muxval and the assignments to muxval. In the previous model, muxval was a signal, and signal assignment statements were used to assign values to it.
In fact, the value 0 is scheduled in an event for the next simulation delta because no delay was specified. When the second statement: IF (a = ‘1’) THEN muxval <= muxval + 1; END IF; Sequential Processing 45 is executed, the value of signal muxval is whatever was last propagated to it. The new value scheduled from the first statement has not propagated yet. In fact, when multiple assignments to a signal occur within the same process statement, the last assigned value is the value propagated. The signal muxval has a garbage value when entering the process.
The next example shows more complicated signal assignment statements and demonstrates the concept of concurrency in greater detail. In Figure 2-2, the symbol for a four-input multiplexer is shown. ALL; ENTITY mux4 IS PORT ( i0, i1, i2, i3, a, b : IN std_logic; PORT ( i0, i1, i2, i3, a, q : OUT std_logic); END mux4; ARCHITECTURE mux4 OF mux4 IS SIGNAL sel: INTEGER; BEGIN WITH sel SELECT q <= i0 AFTER 10 ns WHEN 0, q <= i1 AFTER 10 ns WHEN 1, 18 Chapter Two MUX4 Figure 2-2 Mux4 Symbol. I0 I1 Q I2 I3 A B q <= i2 AFTER 10 ns WHEN 2, q <= i3 AFTER 10 ns WHEN 3, q <= ‘X’ AFTER 10 ns WHEN OTHERS; sel <= 0 WHEN 1 WHEN 2 WHEN 3 WHEN 4 ; END mux4; a a a a = = = = ‘0’ ‘1’ ‘0’ ‘1’ AND AND AND AND b b b b = = = = ‘0’ ‘0’ ‘1’ ‘1’ ELSE ELSE ELSE ELSE The entity for this model has six input ports and one output port.