By Pong P. Chu
FPGA Prototyping utilizing Verilog Examples offers you a hands-on creation to Verilog synthesis and FPGA programming via a “learn via doing” method. through following the transparent, easy-to-understand templates for code improvement and the varied useful examples, you could quick boost and simulate a worldly electronic circuit, comprehend it on a prototyping equipment, and confirm the operation of its actual implementation. This introductory textual content that may give you a fantastic origin, instill self assurance with rigorous examples for complicated structures and get ready you for destiny improvement projects.
Preview of FPGA Prototyping By Verilog Examples: Xilinx Spartan-3 Version PDF
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Extra info for FPGA Prototyping By Verilog Examples: Xilinx Spartan-3 Version
Directory five. four Mealy machine-based side detector module e d g e - d e t e c t - m e a l y ( five enter twine c l okay , r e s e t , i n p u t cord l e v e l , o u t p u t reg t i c okay 1; 10 // s y m b o l i c s t a t e d e c l a r a t i o n localparam z e r o = l ' b O , one = l ' b l ; // s i g n a l d e c l a r a t i o n reg s t a t e - r e g , s t a t e - n e x t ; 15 // nation sign in regularly @ ( p o s e d g e c l okay , p o s e d g e r e s e t if ( r e s e t ) s t a t e - r e g <= z e r o ; else s t a t e - r e g <= s t a t e - n e x t ; (a) nation diagram (b) ASM chart determine five. 6 area detector in accordance with a Mealy computer. // n e x t - s t a t e l o g i c and o u t p u t l o g i c constantly Q* start state-next = state-reg; // d e f a u l t t i c ok = l'bO; // d e f a u l t case ( s t a t e - r e g ) 0 : if (level) commence tick = l'bl; state-next = one; finish one : if (-level) state-next = 0; default : state-next = 0; endcase finish JU endmodule s t a t e : t h e similar output: zero tick point clk determine five. 7 Gate-level implementation of an facet detector. Direct implementation because the transitions of the sting detector circuit are extremely simple, it may be applied with out utilizing an FSM. We contain this implementation for comparability reasons. The circuit diagram is proven in determine five. 7. it may be interpreted that the output is said in simple terms while the present enter is 1 and the former enter, that's kept within the sign up, is zero. The corresponding code is proven in directory five. five. directory five. five Gate-level implementation of an facet detector module edge-det ect - g a t e ( five enter twine clk, reset, i n p u t cord point, output twine tick 1; // s i g n a l d e c l a r a t i o n r e g delay-reg ; I0 // d e l a y check in constantly Q ( p o s e d g e clk, posedge reset) i f (reset) d e l a y - r e g <= l'bO; else d e l a y - r e g <= l e v e l ; // interpreting l o g i c a s s i g n tick = -delay-reg & point; 20 endmodule even though the descriptions in Listings five. four and five. five seem to be very various, they describe a similar circuit. The circuit diagram may be derived from the FSM if we assign zero and 1 to the z e r o and one states. comparability while either Moore desktop- and Mealy machine-based designs can generate a brief tick on the emerging fringe of the enter sign, there are numerous refined variations. The Mealy machine-based layout calls for fewer states and responds swifter, however the width of its output may possibly differ and enter system defects should be handed to the output. the alternative among the 2 designs is dependent upon the subsystem that makes use of the output sign. more often than not the subsystem is a synchronous approach that stocks an identical clock sign. because the FSM's output is sampled in basic terms on the emerging fringe of the clock, the width and system defects don't topic so long as the output sign is solid round the area. be aware that the Mealy output sign is out there for sampling at t l ,which is one clock cycle swifter than bounces (last below 20 ms) bounces (last lower than 20 ms) - -or~glnal sw~tchoutput - , I *--4 debounced output (scheme 1) debounced output (scheme 2) 20 rns Y I 20 ms four C 20 ms determine five.