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标题: 熟悉verilog任务用法的指教一下 [打印本页]

作者: tomqi19810 时间: 2006-9-8 16:11 标题: 熟悉verilog任务用法的指教一下

task shift_out;
begin
    out_flag = 1;
    for(i=6;i>=0;i=i-1)
     begin
@ (negedge scl);
#`timeslice;
sda_buf = sda_buf<<1;
         end
    @(negedge scl) #`timeslice sda_buf[7] = 1; //非应答信号输出
    @(negedge scl) #`timeslice out_flag = 0;
end
endtask
这个@(negedge scl)可以在任务里面用吗？
编译的时候怎么老出错啊？
那位知道？谢谢了

作者: tomqi19810 时间: 2006-9-11 09:22

eeprom.v" line 140: Unsupported Event Control Statement.
ERROR:Xst:850 - "eeprom.v" line 141: Unsupported Event Control Statement.
ERROR:Xst:850 - "eeprom.v" line 142: Unsupported Event Control Statement.
ERROR:Xst:850 - "eeprom.v" line 143: Unsupported Event Control Statement.
ERROR:Xst:850 - "eeprom.v" line 144: Unsupported Event Control Statement.
ERROR:Xst:850 - "eeprom.v" line 145: Unsupported Event Control Statement.
ERROR:Xst:850 - "eeprom.v" line 146: Unsupported Event Control Statement.
ERROR:Xst:850 - "eeprom.v" line 147: Unsupported Event Control Statement.
ERROR:Xst:850 - "eeprom.v" line 148: Unsupported Event Control Statement.
我这个程序是一本书上的例子，我想问时序逻辑在任务里面怎么用？
谢谢了

作者: tomqi19810 时间: 2006-9-11 09:32

always @ (negedge sda)
if(scl == 1 )
begin
State = State + 1;
if(State == 2'b11)
disable write_to_eeprm;
end
FATAL_ERROR:Xst

ortability/export/Port_Main.h:127:1.13.276.1 - This application has discovered an exceptional condition from which it cannot recover. Process will terminate. To resolve this error, please consult the Answers Database and other online resources at http://support.xilinx.com. If you need further assistance, please open a Webcase by clicking on the "WebCase" link at http://support.xilinx.com
disable怎么也不可以用啊？

作者: davidloved 时间: 2006-9-13 21:10

State ==2'b11改成 State =2'b11
试一下

作者: davidloved 时间: 2006-9-13 21:14

多了一个end

作者: davidloved 时间: 2006-9-13 21:36

用task时，要有端口与类型说明，再begin，end

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