2015年11月1日 · reg elements can be used as output within an actual module declaration. But,reg elements cannot be connected to the output port of a module instantiation. Thus, a reg can drive a wire as RHS of an assign statement. On the other way round, a wire can drive a reg in as RHS of a procedural block. For clear idea about declaration of reg or wire ...

2016年11月28日 · For Verilog, assign statements can only be applied on net types (e.g. wire). This is legal: module test ( output LED0 ); // LED0 is an inferred wire assign LED0 = 1'b1; endmodule This is illegal: module test ( output reg LED0 ); // Explicit reg assign LED0 = 1'b1; // illegal, assign on a reg endmodule

2023年4月7日 · reg and wire specify how the object will be assigned and are therefore only meaningful for outputs. If you plan to assign your output in sequential code,such as within an always block, declare it as a reg (which really is a misnomer for "variable" in Verilog).

The only real difference between wire and reg declarations in Verilog is that a reg can be assigned to in a procedural block (a block beginning with always or initial), and a wire can be assigned in a continuous assignment (an assign statement) …

2018年8月25日 · So far I have studied verilog HDL reg [7:0] a [0:3] means array of 4 a's and each a is of 8 bit wide like 00110011 01000011 00010011 10000011 am i right? then what is the meaning of reg [7:0] a ...

You have to use a reg type for y simply because it appears on the left side of an assignment statement inside an always block. Many people consider this a disadvantage of Verilog, which is hard to argue with. In VHDL, a signal type would be used instead of …

If I need to use 4 8-bit numbers, I would declare the following reg: reg [7:0] numbers [3:0] I'm quite confused about the difference between the first and second declaration ([7:0] and [3:0]).

2010年4月12日 · The reg named icache_ram_rw created by you is now a register and is not same as pin; so to assign an register you need to use a proper format of verilog; verilog allows the same by using always statement , a DFF is created and the input pin of that DFF would be your icache_ram_rw , the format is already been provided by others .

2012年4月4日 · module top ( input wire clk, output wire [7:0] led ); wire [7:0] data_reg ; assign data_reg = 8'b10101011; assign led = data_reg; endmodule If you actually want a flop where you can change the value, the default would be in the reset clause.

2023年1月8日 · There is no difference between logic and reg. The difference between bit and the other two is that bit is 2-state, whereas logic/reg are 4-state. Refer to IEEE Std 1800-2017, section 6.11.2, 2-state (two-value) and 4-state (four-value) data types: logic and reg denote the same type. Also, section 6.3.1 Logic values: