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[/] [srdydrdy_lib/] [trunk/] [examples/] [bridge/] [rtl/] [ring_arb.v] - Rev 19
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module ring_arb ( input clk, input reset, input [`NUM_PORTS-1:0] rarb_req, output reg [`NUM_PORTS-1:0] rarb_ack ); integer i; reg [`NUM_PORTS-1:0] nxt_rarb_ack; reg [$clog2(`NUM_PORTS)-1:0] nxt_ack; always @* begin nxt_rarb_ack = rarb_ack; nxt_ack = 0; if (rarb_req == 0) nxt_rarb_ack = 0; else if ((rarb_ack == 0) | ((rarb_req & rarb_ack) == 0)) begin nxt_ack = 0; for (i=`NUM_PORTS; i>0; i=i-1) if (rarb_req[i-1]) nxt_ack = i-1; nxt_rarb_ack = 1 << nxt_ack; end end // always @ * always @(posedge clk) begin if (reset) rarb_ack <= #1 0; else rarb_ack <= #1 nxt_rarb_ack; end endmodule // ring_arb
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