myhdl-list

[myhdl-list] always_seq

[Christopher F. <chr...@gm...>]

I apologize in advance to the lack of information
but I was modifying some old code and decide to give
the always_seq a whirl in the code.  I ran into a small
issue.  If I have a description like the following,
the generated Verilog does not have the correct /begin/ /end/.

MyHDL description:

    from myhdl import *

     def p_edge(clock, reset, slow_sig, sig_posedge):
         _delay = Signal(False)
         @always_seq(clock.posedge, reset=reset)
         def hdl_edge():
             _delay.next = slow_sig
             if not _delay and slow_sig:
                 sig_posedge.next = True
             else:
                 sig_posedge.next = False

         return hdl_edge

     def convert():
         clock = Signal(False)
         reset = ResetSignal(True, active=0, async=True)
         sig = Signal(False)
         edge = Signal(False)
         toVerilog(p_edge, clock, reset, sig, edge)

     if __name__ == '__main__':
         convert()


Generated Verilog:

     always @(posedge clock, negedge reset) begin: P_EDGE_HDL_EDGE
         if (reset == 0) begin
             sig_posedge <= 0;
             _delay <= 0;
         end
         else
             _delay <= slow_sig;
             if (((!_delay) && slow_sig)) begin
                 sig_posedge <= 1'b1;
             end
             else begin
                 sig_posedge <= 1'b0;
             end
         end

     endmodule


Regards,
Chris

Re: [myhdl-list] always_seq

[Jan D. <ja...@ja...>]

A bug - I had only used VHDL conversion of this brand
new featur so far. I have solved this, it's in the
public repo's.

Worked very well in VHDL, so thanks for trying this
out in Verilog also.

On 08/28/2012 05:38 AM, Christopher Felton wrote:
>
> I apologize in advance to the lack of information
> but I was modifying some old code and decide to give
> the always_seq a whirl in the code.  I ran into a small
> issue.  If I have a description like the following,
> the generated Verilog does not have the correct /begin/ /end/.
>
> MyHDL description:
>
>     from myhdl import *
>
>      def p_edge(clock, reset, slow_sig, sig_posedge):
>          _delay = Signal(False)
>          @always_seq(clock.posedge, reset=reset)
>          def hdl_edge():
>              _delay.next = slow_sig
>              if not _delay and slow_sig:
>                  sig_posedge.next = True
>              else:
>                  sig_posedge.next = False
>
>          return hdl_edge
>
>      def convert():
>          clock = Signal(False)
>          reset = ResetSignal(True, active=0, async=True)
>          sig = Signal(False)
>          edge = Signal(False)
>          toVerilog(p_edge, clock, reset, sig, edge)
>
>      if __name__ == '__main__':
>          convert()
>
>
> Generated Verilog:
>
>      always @(posedge clock, negedge reset) begin: P_EDGE_HDL_EDGE
>          if (reset == 0) begin
>              sig_posedge <= 0;
>              _delay <= 0;
>          end
>          else
>              _delay <= slow_sig;
>              if (((!_delay) && slow_sig)) begin
>                  sig_posedge <= 1'b1;
>              end
>              else begin
>                  sig_posedge <= 1'b0;
>              end
>          end
>
>      endmodule
>
>
> Regards,
> Chris
>
>
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-- 
Jan Decaluwe - Resources bvba - http://www.jandecaluwe.com
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