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题目内容
(佳木斯大学语言治疗学)
在VHDL语言中,下列对时钟边沿检测描述中,错误的是
·if clk’event and clk = ‘1’ then
·if falling_edge(clk) then
·if clk’event and clk = ‘0’ then
·if clk’stable and not clk = ‘1’ then
·if clk’event and clk = ‘1’ then
·if falling_edge(clk) then
·if clk’event and clk = ‘0’ then
·if clk’stable and not clk = ‘1’ then
参考答案