![2 bit gray code counter verilog code 2 bit gray code counter verilog code](https://1.bp.blogspot.com/-B9jZYsioqF4/WCfkdw2VIzI/AAAAAAAAHRI/JfkRxYlt7R8arbe6vHHPCu4bsUyRfGGGwCEw/s1600/14106.png)
Next, look at the output printed by the command window: You can see that the results of both conversions are correct. 2-Bit Binary Up Counter 2-Bit Binary Up/Down Counter 2-Bit Gray Code Up Counter Write a Verilog code on a piece of paper of the selected Verilog counter. Initial $monitor("bin_in:%b, gray:%b, bin_out:%b",bin_in,gray,bin_out) Electrical Engineering questions and answers. -įorever #20 bin_in = bin_in + 1 // Add 1 every 20ns Parameter data_width = 'd4 //Data Bit Width From sub-high to 0, binary high and sub-high Grey codes differ orįor(i = 0 i. Input gray, //Gray CodeĪssign bin = gray //Top Bit Direct Equality You can see that the highest bit does not need to be converted, and binary high and low gray codes are different from or from the second highest bit, then generate-for can be used to construct a duplicate assignment with the following code: //Gray code to binary If a 4-bit Grey code is converted to binary, then: Using the highest bit of the gray code as the highest bit of the binary, the binary secondary high bit generation process uses the binary high and secondary high bit gray codes to be different or derived, and the values of other bits are similar to the secondary high bit generation process. Gray codes are converted to binary codes by the following principles: Gray code counters have the same carry issues as regular binary > counters. Verilog code that converts binary code to gray code is easy to write according to the formula: //Binary to Gray Code
2 bit gray code counter verilog code mod#
Hence we must design a mod 2n gray counter.
![2 bit gray code counter verilog code 2 bit gray code counter verilog code](https://i2.wp.com/asicdigitaldesign.files.wordpress.com/2008/06/non-power-2-gray-031.png)
It is not difficult to deduce a general formula from the above formula: gray = (bin > 1) ^ bin. A gray counter designed for any mod number other than 2n, n being number of bits, does not remain as gray code.
![2 bit gray code counter verilog code 2 bit gray code counter verilog code](https://i.ytimg.com/vi/jpmp9uvjrwU/hqdefault.jpg)
If these digital signals are sampled directly using an asynchronous clock, metastability or data sampling errors are likely to occur. For example, when a number changes from 7 to 8, all 4-bit binary numbers jump. You can see that the Gray Code in the table above has only one digit per change, which effectively avoids the possibility of metastable problems in the case of CDC (cross-clock domain). The following table gives the comparison of 4 bit natural binary code, 4 bit typical gray code (no special description, typical gray code) and 4 bit decimal integer: Gray codes are often used in communication, FIFO, or RAM address addressing counters. The next pages contain the Verilog 1364-2001 code of all design examples. Because of this feature, metastable states in binary coded count combinational circuits can be avoided. Gray codes are characterized by a jump in only one data bit when changing from one number to an adjacent number.
2 bit gray code counter verilog code download#
You could download file gray_counter.Gray code is a cyclic binary code, or reflex binary code. To run the simulation, run iverilog -o counter statemachine.v statemachinetb.v & vvp counter. 1 //-Ħ //-ġ3 14 //-Input Ports-ġ6 //-Output Ports-ġ8 //-Internal Variables-Ģ1 //-Code Starts Here-Ģ7 28 assign out = Simple two bit binary counter, implemented in Verilog.