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// The MIT License
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//
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// Copyright (c) 2006 Nirav Dave (ndave@csail.mit.edu)
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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import FIFO::*;
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import DataTypes::*;
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import Interfaces::*;
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import LibraryFunctions::*;
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function Header#(24) makeHeader(Rate rate, Bit#(12) length);
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function Bit#(4) translate_rate(Rate r);
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case (r)
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R1: return 4'b1101;
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R2: return 4'b1111;
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R4: return 4'b0101;
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default: return ?;
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endcase
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endfunction
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function Bit#(12) translate_length (Bit#(12) x) = reverseBits(x);
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Bit#(1) parity = getParity({translate_rate(rate),length});
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return({translate_rate(rate),1'b0,translate_length(length),parity,6'b0});
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endfunction
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(* synthesize *)
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module mkController(Controller#(24,24,24));
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FIFO#(RateData#(24)) toS <- mkFIFO();
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FIFO#(Header#(24)) toC <- mkFIFO();
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Reg#(Bool) active <- mkReg(False);
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Reg#(Bit#(12)) length <- mkRegU;
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Reg#(Rate) rate <- mkRegU;
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method Action getFromMAC(TXMAC2ControllerInfo x) if (!active);
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active <= True;
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length <= x.length();
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rate <= x.rate();
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toC.enq( makeHeader(x.rate, x.length));
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endmethod
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method Action getDataFromMAC(Data#(24) x) if (active);
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toS.enq(RateData{
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rate: rate,
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data: x.data
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});
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rate <= RNone;
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length <= length - 3;
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if (length <= 3 )
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active <= False;
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endmethod
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method ActionValue#(Header#(24)) getHeader();
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toC.deq();
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return(toC.first);
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endmethod
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method ActionValue#(RateData#(24)) getData();
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toS.deq();
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return(toS.first);
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endmethod
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endmodule
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