Controller.bsv
上传用户:aoptech
上传日期:2014-09-22
资源大小:784k
文件大小:3k
- // The MIT License
- //
- // Copyright (c) 2006 Nirav Dave (ndave@csail.mit.edu)
- //
- // Permission is hereby granted, free of charge, to any person obtaining a copy
- // of this software and associated documentation files (the "Software"), to deal
- // in the Software without restriction, including without limitation the rights
- // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- // copies of the Software, and to permit persons to whom the Software is
- // furnished to do so, subject to the following conditions:
- //
- // The above copyright notice and this permission notice shall be included in
- // all copies or substantial portions of the Software.
- //
- // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- // THE SOFTWARE.
- import FIFO::*;
- import DataTypes::*;
- import Interfaces::*;
- import LibraryFunctions::*;
- function Header#(24) makeHeader(Rate rate, Bit#(12) length);
- function Bit#(4) translate_rate(Rate r);
- case (r)
- R1: return 4'b1101;
- R2: return 4'b1111;
- R4: return 4'b0101;
- default: return ?;
- endcase
- endfunction
- function Bit#(12) translate_length (Bit#(12) x) = reverseBits(x);
-
- Bit#(1) parity = getParity({translate_rate(rate),length});
-
- return({translate_rate(rate),1'b0,translate_length(length),parity,6'b0});
-
- endfunction
- (* synthesize *)
- module mkController(Controller#(24,24,24));
- FIFO#(RateData#(24)) toS <- mkFIFO();
- FIFO#(Header#(24)) toC <- mkFIFO();
- Reg#(Bool) active <- mkReg(False);
- Reg#(Bit#(12)) length <- mkRegU;
- Reg#(Rate) rate <- mkRegU;
-
- method Action getFromMAC(TXMAC2ControllerInfo x) if (!active);
- active <= True;
- length <= x.length();
- rate <= x.rate();
- toC.enq( makeHeader(x.rate, x.length));
- endmethod
- method Action getDataFromMAC(Data#(24) x) if (active);
- toS.enq(RateData{
- rate: rate,
- data: x.data
- });
- rate <= RNone;
- length <= length - 3;
- if (length <= 3 )
- active <= False;
- endmethod
-
- method ActionValue#(Header#(24)) getHeader();
- toC.deq();
- return(toC.first);
- endmethod
-
- method ActionValue#(RateData#(24)) getData();
- toS.deq();
- return(toS.first);
- endmethod
- endmodule