testbench常用任务之SPI slave输出数据

模仿了SPI master从SPI slave读取数据的MiSO数据状态

每8个clk后读取的数据加1

用的一些额外寄存器需要自己声明和初始化

 

//-------------------------------------------------------------------------
//send serial data which is increase by 1 on MiSO line
//-------------------------------------------------------------------------
task SPIMiSo ;                    
    /*port declaration*/
    begin
        repeat(256) 
        begin
            TmpData = TmpDataBak ;
            repeat(8)
            begin
                //@ (negedge Sclk) ;
                OutLine = TmpData[7] ;
                TmpData ={TmpData[6:0],1'b0} ;             //左移,低位移入新数据
                @ (negedge Sclk) ;
                OutLine = 0 ;
            end
            TmpDataBak = TmpDataBak + 1 ;
        end
    end
endtask