Verilog Programming part 20 ppt

... four types of looping statements in Verilog: while, for, repeat, and forever. The syntax of these loops is very similar to the syntax of loops in the C programming language. All looping statements ... end 7.6.2 For Loop The keyword for is used to specify this loop. The for loop contains three parts: • An initial condition • A check to see if the terminating condition is true • A pro...

Ngày tải lên: 01/07/2014, 21:20

... connections. However, a warning is typically issued that the widths do not match. Unconnected ports Verilog allows ports to remain unconnected. For example, certain output ports might be simply for ... There are rules governing port connections when modules are instantiated within other modules. The Verilog simulator complains if any port connection rules are violated. These rules ar...

Ngày tải lên: 01/07/2014, 21:20

... Team LiB ] 1.5 Popularity of Verilog HDL Verilog HDL has evolved as a standard hardware description language. Verilog HDL offers many useful features • Verilog HDL is a general-purpose ... easy to use. It is similar in syntax to the C programming language. Designers with C programming experience will find it easy to learn Verilog HDL. • Verilog HDL allows different lev...

Ngày tải lên: 01/07/2014, 21:20

... reset is asserted from 0 to 20 and from 200 to 220. initial begin reset = 1'b1; #15 reset = 1'b0; #180 reset = 1'b1; #10 reset = 1'b0; #20 $finish; //terminate the ... = 0 20 Output q = 1 30 Output q = 2 40 Output q = 3 50 Output q = 4 60 Output q = 5 70 Output q = 6 80 Output q = 7 90 Output q = 8 100 Output q = 9 110 Output q = 10 12...

Ngày tải lên: 01/07/2014, 21:20

... Variable Vector Part Select Another ability provided in Verilog HDl is to have variable part selects of a vector. This allows part selects to be put in for loops to select various parts of the ... vector. There are two special part- select operators: [<starting_bit>+:width] - part- select increments from starting bit [<starting_bit>-:width] - part- select decremen...

Ngày tải lên: 01/07/2014, 21:20

... module. Tasks are used for common Verilog code that contains delays, timing, event constructs, or multiple output arguments. Functions are used when common Verilog code is purely combinational, ... 8.1 Differences between Tasks and Functions Tasks and functions serve different purposes in Verilog. We discuss tasks and functions in greater detail in the following sections. However,...

Ngày tải lên: 01/07/2014, 21:20

... #10 z = {x, y}; join #20 w = {y, x}; end N amed blocks Blocks can be given names. • Local variables can be declared for the named block. • Named blocks are a part of the design hierarchy. ... converted Verilog code is shown in Example 7-27. The result of simulation remains the same except that all statements start in parallel at time 0. Hence, the block finishes at time 20 i...

Ngày tải lên: 01/07/2014, 21:20

... bit 8 and apply it to c_in. Apply 20 random test vectors and observe the output. 8: Use the 8-byte memory initialization example in Example 9-14 on page 205 . Modify the file to read data in ... Dump all variables two levels deep in module instance top.a1.b1.c1. • Stop dumping to VCD at time 200 . • Start dumping to VCD at time 400. • Stop dumping to VCD at time 500. • Create a chec...

Ngày tải lên: 01/07/2014, 21:20

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