如果sel为3,默认语句有助于将输出设置为0。 module my_mux (input [2:0] a, b, c, // Three 3-bit inputs [1:0] sel, // 2-bit select signal to choose from a, b, c output reg [2:0] out); // Output 3-bit signal // This always block is executed whenever a, b, c or sel...
Verilog case语句以case关键字开始,以endcase关键字结束。匹配表达式将被精确地计算一次,并按照它们的编写顺序与备选方案列表进行比较,以及执行备选方案与给定表达式匹配的语句。一个由多个语句组成的块必须分组,并且位于begin和end之间。 // Here 'expression' should match one of the items (item 1,2,3,or 4)...
The design module shown below has a 2-bit select signal to route one of the three other 3-bit inputs to the output signal calledout. Acasestatement is used to assign the correct input to output based on the value ofsel. Sinceselis a 2-bit signal, it can have 22combinations, 0 throu...
A single bit multiplexer will have one control line two inputs ( say X and Y) and one output ( say Z). When the control is 0, X is connected to Z. When the Control is 1, Y is connected to Z. The figure below explains this Let write this example using verilog case statement ...
// Here 'expression' should match one of the items (item 1,2,3 or 4)case(<expression>)case_item1:<single statement>case_item2,case_item3:<single statement>case_item4:begin<multiple statements>enddefault:<statement>endcase 如果所有的case项都不符合给定的表达式,则执行缺省项内的语句,缺省语句...
CAUSE: In a Verilog Design File ( .v ) , you used a case item expression that contains a Don't Care ( x ) or High Impedance ( z ) value. During simulation, the value of a case item expression must ...
Is the systemverilog "case inside" statement for definitions of a range of conditions within a case block available for synthesis and, if not, when will this be implemented? Subscribe More actions Branden_Allen Beginner 10-31-2018 09:51 PM 11,465 Views Description...
I'm a beginner for verilog design. I have a question. Is there any way that could express a case statement in for loop including default part? I tried the code below. /// (reg [2:0] ctrl) for(i=0 ; i<5; i=i\+1) begin case(ctrl) i : begin out <= i; end endcase end...
19 #1; 20 end 21 end 22 endmodule 2 1 // Code your design here 2 Log Share 702views and0likesPublic (anyone with the link can view)Published (will appear in search results)Private (only you can view) case statement example
“full_case parallel_case”, the Evil Twins of Verilog Synthesis Quiz and Sample Source Code Now it’s time for a quiz! How will each of the following variations of case statement behave when the case expression matches one of the non-default case items ...