聊聊Systemverilog中的function in constraints 有些情况下,constraint不能简单用一行来表达,而是需要复杂的计算,如果都写到constraint block内部就比较复杂,而且很乱,这时候可以调用functions来约束随机变量。在constraint内调用function就称为”function in constraints”。它的格式如下: constraintconstraint_name {rand_var=...
聊聊Systemverilog中的function in constraints 有些情况下,constraint不能简单用一行来表达,而是需要复杂的计算,如果都写到constraint block内部就比较复杂,而且很乱,这时候可以调用functions来约束随机变量。在constraint内调用function就称为”function in constraints”。 2023-06-21 17:31:28 简谈FPGA verilog中的...
技术标签:EDAsystemverilogvcs 对于约束条件中包含function的解约束过程, function中的参数会被优先解开,function会被当作state value 而不是rand value 优先返回,这时候会发生解冲突,常见的vcs报错如下: Error-[CNST-ICE] Constraint infeasible constraints error Error-[CNST-CIF] Constraints incon... ...
(name); endfunction constraint c_paddr { paddr inside {8'hF0, 8'hE0, 8'hE1, 8'hE2, 8'hE3, 8'hD0, 8'hD1, 8'hD2, 8'hD3}; } endclass ///Driver/// class driver extends uvm_driver #(transaction); `uvm_component_utils(driver) virtual top_if vif; transaction tr; function new...
needed for one RO to produce a frequency in this range [23,25]. This design constraint will increase costly area and power overhead. In contrast, we propose an ring oscillator design that slows the oscillating frequency by using only a fraction of the number of inverters used in a RO-PUF...
聊聊Systemverilog中的function in constraints 有些情况下,constraint不能简单用一行来表达,而是需要复杂的计算,如果都写到constraint block内部就比较复杂,而且很乱,这时候可以调用functions来约束随机变量。在constraint内调用function就称为”function in constraints”。 2023-06-21 17:31:28 S-function详解与模型参...