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parameter NUM_WORDS = 4096;
parameter ADDR_WIDTH = 12;
reg [NUM_WORDS-1:0] addr;
reg [NUM_WORDS-1:0] temp, temp2;
reg [ADDR_WIDTH-1:0] maddr;
always @(posedge clk)
begin
if (~|temp) temp = addr;
for (i = NUM_WORDS-1; i >= 0; i = i - 1) if (temp==1'b1)
begin
maddr = i;
out = |(maddr);
end
temp[maddr]=1'b0;
end