9086/system/proc_state_def.v

/* proc_state_def.v - Definitions of the states in the main state machine
   of the 9086 CPU.

   This file is part of the 9086 project.

   Copyright (c) 2023 Efthymios Kritikos

   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

`define PROC_STATE_BITS	6


`define PROC_HALT_STATE				6'b000000

/*INSTRUCTION FETCH STATE*/
`define PROC_IF_STATE_ENTRY			6'b000001
`define PROC_IF_WRITE_CIR			6'b000010
`define PROC_IF_STATE_EXTRA_FETCH_SET		6'b000011
`define PROC_IF_STATE_EXTRA_FETCH		6'b000100


/*DECODE SATE*/
`define PROC_DE_STATE_ENTRY			6'b001000
`define PROC_DE_LOAD_16_PARAM			6'b001001
`define PROC_DE_LOAD_16_EXTRA_FETCH_SET		6'b001010
`define PROC_DE_LOAD_16_EXTRA_FETCH		6'b001011
`define PROC_DE_LOAD_REG_TO_PARAM		6'b001100

/*MEM/IO READ*/
`define PROC_MEMIO_READ				6'b010000
`define PROC_MEMIO_READ_SETADDR			6'b010001
`define PROC_MEMIO_GET_ALIGNED_DATA		6'b010010 /* :) */
`define PROC_MEMIO_GET_UNALIGNED_DATA		6'b010011 /* :( */
`define PROC_MEMIO_GET_SECOND_BYTE		6'b010100
`define PROC_MEMIO_GET_SECOND_BYTE1		6'b010101
`define PROC_DE_LOAD_8_PARAM			6'b010110

/*EXECUTE STATE*/
`define PROC_EX_STATE_ENTRY			6'b100000

/*MEM/IO WRITE*/
`define PROC_MEMIO_WRITE			6'b101000
`define PROC_MEMIO_PUT_ALIGNED_16BIT_DATA	6'b101001
`define PROC_MEMIO_PUT_UNALIGNED_16BIT_DATA	6'b101010
`define PROC_MEMIO_PUT_BYTE			6'b101011
`define PROC_MEMIO_WRITE_EXIT			6'b101101
`define PROC_MEMIO_PUT_UNALIGNED_PREP_NEXT	6'b101111
`define PROC_MEMIO_PUT_UNALIGNED_PREP_NEXT2	6'b110010

`define PROC_NEXT_MICROCODE			6'b111000

`define PROC_RESET				6'b111100