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//////////////////////////////////////////////////////////////////
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// //
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// Parameters file for Amber 25 Core //
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// //
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// This file is part of the Amber project //
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// http://www.opencores.org/project,amber //
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// //
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// Description //
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// Holds general parameters that are used is several core //
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// modules //
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// //
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// Author(s): //
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// - Conor Santifort, csantifort.amber@gmail.com //
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// //
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//////////////////////////////////////////////////////////////////
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// //
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// Copyright (C) 2011 Authors and OPENCORES.ORG //
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// //
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// This source file may be used and distributed without //
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// restriction provided that this copyright statement is not //
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// removed from the file and that any derivative work contains //
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// the original copyright notice and the associated disclaimer. //
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// //
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// This source file is free software; you can redistribute it //
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// and/or modify it under the terms of the GNU Lesser General //
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// Public License as published by the Free Software Foundation; //
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// either version 2.1 of the License, or (at your option) any //
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// later version. //
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// //
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// This source is distributed in the hope that it will be //
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// useful, but WITHOUT ANY WARRANTY; without even the implied //
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// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR //
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// PURPOSE. See the GNU Lesser General Public License for more //
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// details. //
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// //
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// You should have received a copy of the GNU Lesser General //
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// Public License along with this source; if not, download it //
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// from http://www.opencores.org/lgpl.shtml //
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// //
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//////////////////////////////////////////////////////////////////
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// Instruction Types
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localparam [3:0] REGOP = 4'h0, // Data processing
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MULT = 4'h1, // Multiply
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SWAP = 4'h2, // Single Data Swap
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TRANS = 4'h3, // Single data transfer
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MTRANS = 4'h4, // Multi-word data transfer
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BRANCH = 4'h5, // Branch
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CODTRANS = 4'h6, // Co-processor data transfer
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COREGOP = 4'h7, // Co-processor data operation
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CORTRANS = 4'h8, // Co-processor register transfer
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SWI = 4'h9; // software interrupt
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// Opcodes
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localparam [3:0] AND = 4'h0, // Logical AND
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EOR = 4'h1, // Logical Exclusive OR
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SUB = 4'h2, // Subtract
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RSB = 4'h3, // Reverse Subtract
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ADD = 4'h4, // Add
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ADC = 4'h5, // Add with Carry
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SBC = 4'h6, // Subtract with Carry
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RSC = 4'h7, // Reverse Subtract with Carry
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TST = 4'h8, // Test (using AND operator)
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TEQ = 4'h9, // Test Equivalence (using EOR operator)
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CMP = 4'ha, // Compare (using Subtract operator)
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CMN = 4'hb, // Compare Negated
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ORR = 4'hc, // Logical OR
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MOV = 4'hd, // Move
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BIC = 4'he, // Bit Clear (using AND & NOT operators)
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MVN = 4'hf; // Move NOT
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// Condition Encoding
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localparam [3:0] EQ = 4'h0, // Equal / Z set
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NE = 4'h1, // Not equal / Z clear
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CS = 4'h2, // Carry set / C set
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CC = 4'h3, // Carry clear / C clear
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MI = 4'h4, // Minus / N set
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PL = 4'h5, // Plus / N clear
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VS = 4'h6, // Overflow / V set
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VC = 4'h7, // No overflow / V clear
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HI = 4'h8, // Unsigned higher / C set and Z clear
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LS = 4'h9, // Unsigned lower
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// or same / C clear or Z set
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GE = 4'ha, // Signed greater
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// than or equal / N == V
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LT = 4'hb, // Signed less than / N != V
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GT = 4'hc, // Signed greater
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// than / Z == 0, N == V
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LE = 4'hd, // Signed less than
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// or equal / Z == 1, N != V
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AL = 4'he, // Always
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NV = 4'hf; // Never
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// Any instruction with a condition field of 0b1111 is UNPREDICTABLE.
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// Shift Types
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localparam [1:0] LSL = 2'h0,
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LSR = 2'h1,
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ASR = 2'h2,
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RRX = 2'h3,
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ROR = 2'h3;
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// Modes
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localparam [1:0] SVC = 2'b11, // Supervisor
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IRQ = 2'b10, // Interrupt
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FIRQ = 2'b01, // Fast Interrupt
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USR = 2'b00; // User
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// One-Hot Mode encodings
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localparam [5:0] OH_USR = 0,
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OH_IRQ = 1,
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OH_FIRQ = 2,
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OH_SVC = 3;
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