🚀 go-pugleaf

Alan Bair (abair@parsons.sps.mot.com) wrote:
: In article <13665@optilink.COM> manley@optilink.COM (Terry Manley) writes:
:>   More specifically why doesn't the following work:
:>
:>   reg a,b,c;
:>
:>   always @(posedge Clk) c = b;
:>   always @(posedge Clk) b = a;
:>
:>	always @(posedge Clk)
:>	  fork
:>		c = b;
:>		b = a;
:>	  join
:>
: However, this has the same problem as the two always blocks, there is no
: control over which will take place first. I can't remember the exact syntax,
: but there is a way to specify that the values of b & a are first saved and
: then the assignments take place. This allows them to occur in any order, but
: get the results you are after.
: 
 What you want to do is something like this :
    always @(posedge Clk) c <= #1 b;
    always @(posedge Clk) b <= #1 a;

 This code means " evaluate b at posedge of Clk, save this value, and assign
 it to c 1 time later."
 This syntax is also called "non-blocking assignment" (or similar).
 Idem for the second always.

:>   --
:>   dave
:>   manley@optilink.com
:>
: --
: Alan Bair             		AMCU DSCS
: Motorola, Inc.            	    (Design Software &
: Mail Stop OE-320		     Computer Services)
: 6501 William Cannon Dr. West	
: Austin, TX  78735-8598          abair@parsons.sps.mot.com

Hope this can help you,

Leo

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