forked from Github_Repos/cvw
46 lines
1.9 KiB
Systemverilog
46 lines
1.9 KiB
Systemverilog
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// pmaadrdec.sv
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//
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// Written: David_Harris@hmc.edu 29 January 2021
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// Modified:
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//
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// Purpose: Address decoder
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//
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// A component of the Wally configurable RISC-V project.
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//
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// Copyright (C) 2021 Harvey Mudd College & Oklahoma State University
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation
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// files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy,
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// modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software
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// is 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 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 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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// BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT
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// OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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///////////////////////////////////////////
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`include "wally-config.vh"
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module pmaadrdec (
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input logic [31:0] HADDR,
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input logic [31:0] Base, Range,
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input logic Supported,
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output logic HSEL
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);
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logic [31:0] match;
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// determine if an address is in a range starting at the base
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// for example, if Base = 0x04002000 and range = 0x00000FFF,
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// then anything address between 0x04002000 and 0x04002FFF should match (HSEL=1)
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assign match = (HADDR ~^ Base) | Range;
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assign HSEL = &match & Supported;
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endmodule
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