自己写Function实现对2取对数的功能也有一定的局限性:无法对输入输出端口信号使用该Function。Function是定义在模块内部,所以若输入输出端口也需要根据输入的parameter参数来以2为底取对数的话此种方法就无能为力了。比如:设计一个同步FIFO,输出信号fifo_cnt(计数器)是对写入FIFO的数据进行计数的寄存器,其最大值即为FI...
在老的IEEE verilog版本中,假如不用clog2去计算位宽,我们可能需要如下的function函数来进行位宽计算,这个函数本身很好理解,即通过移位去检测depth的位宽,之后我们需要再将计算得到的数字使用在端口定义的过程中。 function integer clog2(input integer depth);beginif(depth == 0)clog2 = 1;else if(depth != 0...
(input[$clog2(NUM_UNITS)-1:0]active_unit); 4 5 initial 6 $monitor("active_unit = %b",active_unit); 7 endmodule Log Share 2030views and0likesPublic (anyone with the link can view)Published (will appear in search results)Private (only you can view)...
The Math function $clog2 was incorporated starting from Verilog-2005 (IEEE 1364-2005). Before that, clog2 could be realized as a Constant Function in Verilog 2001. Following is a samplefunction that can be used insteadfor the $clog2 function to get a proper output: function integer clog...
So, first, in SystemVerilog, the system function is $clog2 (not $clog). In "plain" Verilog, it was necessary to write a macro similar to the one you show. I don't know about using Verilog 2005 - it may not be possible (or it may - I just don't know). In SystemVerilog, yo...
To get this function working, the -sv switch can be used on the Verilog file. For example, read_verilog -sv test.v. For now, there are no plans to expand support for this in Verilog 2001, but instead the recommendation is to use System Verilog. ...
Wen calling $clog2 (variable) in systemVerilog, the tool complained: [Synth 8-280] expression must be constant: argument to $clog2I replaced $clog2 function with my log2 function (below), then the tools throw another error: [Synth 8-3380] loop cond...
Does anybody know how to use the Verilog HDL $clog2 math function with the Quartus II software? I am trying to use the clog2 (=ceil(log2(x))) function to calculate the address width needed for a RAM block with x number of words, since I think it's a bit silly to have ...
Does anybody know how to use the Verilog HDL $clog2 math function with the Quartus II software? I am trying to use the clog2 (=ceil(log2(x))) function to calculate the address width needed for a RAM block with x number of words, since I think it's...
Wen calling $clog2 (variable) in systemVerilog, the tool complained: [Synth 8-280] expression must be constant: argument to $clog2I replaced $clog2 function with my log2 function (below), then the tools throw another error: [Synth 8-3380] loop cond...