Swap (continued)

• The following does not work either

  • one of the blocks is executed first
  • previous value of variable is lost

• Use delayed assignment to fix this

  • both blocks are scheduled by posedge CLK

always @(posedge CLK) begin A = B; end

always @(posedge CLK) begin B = A; end

always @(posedge CLK) begin A <= B; end

always @(posedge CLK) begin B <= A; end

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