请教,我用VerilogHDL写了个小的程序,没有几行,但是错误不少.现将程序与错误信息贴出来请高人指点.谢先!
/******************************************************************************
VerilogHDL语言部分
******************************************************************************/
module Bus_Expand(TRIG,SELECT,SAMPIN,SAMPOUT,DATA);
input TRIG; //Signal that comes as trig from DSP
input SELECT; //Select the data direction,1=SAMPIN 0=SAMPOUT
input [15:0] SAMPIN; //Declaration of the Sample in signal,16 Channel
output [15:0] SAMPOUT; //Declaration of the Sample out signal,16 Channel
inout [15:0] DATA; //Channels for data exchange between DSP&CPLD
reg [15:0] DATA;
reg [15:0] SAMPOUT;
reg [15:0] TEMP;
always @(TRIG or SELECT)
case({TRIG, SELECT})
10:begin TEMP <=SAMPIN;DATA <=TEMP;end
11:begin TEMP <=DATA;SAMPOUT <=TEMP;end
default:begin DATA <=16'bz;SAMPOUT <=16'bz;TEMP <=16'bz;end
endcase
endmodule
/******************************************************************************
管脚分配部分
******************************************************************************/在 Assignment Editor中，我按照硬件电路图将相应输入输出管脚分配给了DATA,SAMPIN,SAMPOUT,TRIG,SELECT等管脚，但是我不知道怎么将全局时钟,还有JTAG管脚分配给CPLD，因为在module中不需用到这些管脚,在编译时出现如下的错误信息：
/******************************************************************************
编译错误信息
******************************************************************************/
Warning (10199): Verilog HDL Case Statement warning at Bus_Expand.v(13): case item expression is ignored because it never applies
Warning (10199): Verilog HDL Case Statement warning at Bus_Expand.v(14): case item expression is ignored because it never applies
Warning: Design contains 18 input pin(s) that do not drive logic
Warning: No output dependent on input pin "TRIG"
Warning: No output dependent on input pin "SELECT"
Warning: No output dependent on input pin "SAMPIN[0]"
Warning: No output dependent on input pin "SAMPIN[1]"
Warning: No output dependent on input pin "SAMPIN[2]"
Warning: No output dependent on input pin "SAMPIN[3]"
Warning: No output dependent on input pin "SAMPIN[4]"
Warning: No output dependent on input pin "SAMPIN[5]"
Warning: No output dependent on input pin "SAMPIN[6]"
Warning: No output dependent on input pin "SAMPIN[7]"
Warning: No output dependent on input pin "SAMPIN[8]"
Warning: No output dependent on input pin "SAMPIN[9]"
Warning: No output dependent on input pin "SAMPIN[10]"
Warning: No output dependent on input pin "SAMPIN[11]"
Warning: No output dependent on input pin "SAMPIN[12]"
Warning: No output dependent on input pin "SAMPIN[13]"
Warning: No output dependent on input pin "SAMPIN[14]"
Warning: No output dependent on input pin "SAMPIN[15]"
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