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解决方案
下面的示例取自SypPrimePro用户指南(C:\SypLyth\SypLIFIFY70\doc),页面4-80:
VHDL示例:
库IEEE;
使用IEEE.STDYLogiC1164。
实体SRLTEST是
端口(DATAT:STDYLogLogic向量(7下降到0);
CLK,EN:在STDYLogic中;
前台:整数范围3下降到0;
OutDATA:ExtSdLogLogic向量(7下降到0);
结束SRLTEST;
SRLTEST的体系结构RTL是
类型数据类型是StdLogLogic向量的数组(3下降到0)(7下降到0);
信号存储库:数据类型;
开始
OutDATA & L. = ReGeBub(前台);
进程(CLK,InDATA)开始
如果(CLK’事件和CLK=‘1’),则
如果(EN=‘1’),则
RigBand & lt;=(ReGeBand(2下降到0)&吲达塔);
结束如果;
结束如果;
结束过程;
结束RTL;
下面的示例取自SypPrimePro用户指南(C:\SypLyth\SypLIFIFY70\doc),页面4-80:
Verilog示例:
模块TestSRL(CLK,使能,数据,结果,ADDR);
输入CLK,使能;
输入[3:0]数据;
输入[3:0] ADDR;
输出[3:0]结果;
Reg [3:0] ReGubs[15:0];
整数i;
总是@(POSEDGE CLK)开始
如果(启动==1)开始
对于(i=15;i>0;i=i-1)开始
RigBoo[i] & lt;= ReGrave[I-1 ];
结束语
ReGeBl[ 0 ] & lt;=DATAIN;
结束语
结束语
分配结果=ReGeBave[ADDR];
终端模块