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////////////////////////////////////////////////////////////////////////////////

//

// Filename:    memsim.h

//

// Project:     OpenArty, an entirely open SoC based upon the Arty platform

//

// Purpose:     This creates a memory like device to act on a WISHBONE bus.

//              It doesn't exercise the bus thoroughly, but does give some

//              exercise to the bus to see whether or not the bus master

//              can control it.

//

//      This particular version differs from the memsim version within the

//      ZipCPU project in that there is a variable delay from request to

//      completion.

//

//

// Creator:     Dan Gisselquist, Ph.D.

//              Gisselquist Technology, LLC

//

////////////////////////////////////////////////////////////////////////////////

//

// Copyright (C) 2015-2017, Gisselquist Technology, LLC

//

// This program is free software (firmware): 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 MERCHANTIBILITY 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.  (It's in the $(ROOT)/doc directory, run make with no

// target there if the PDF file isn't present.)  If not, see

// <http://www.gnu.org/licenses/> for a copy.

//

// License:     GPL, v3, as defined and found on www.gnu.org,

//              http://www.gnu.org/licenses/gpl.html

//

//

////////////////////////////////////////////////////////////////////////////////

//

//

#ifndef MEMSIM_H

#define MEMSIM_H

class   MEMSIM {

public:

        typedef unsigned int    BUSW;

        typedef unsigned char   uchar;

        BUSW    *m_mem, m_len, m_mask, m_head, m_tail, m_delay_mask, m_delay;

        int     *m_fifo_ack;

        BUSW    *m_fifo_data;

        MEMSIM(const unsigned int nwords, const unsigned int delay=27);

        ~MEMSIM(void);

        void    load(const char *fname);

        void    load(const unsigned int addr, const char *buf,const size_t len);

        void    apply(const uchar wb_cyc, const uchar wb_stb,

                                const uchar wb_we,

                        const BUSW wb_addr, const BUSW wb_data,

                                const uchar wb_sel,

                        uchar &o_ack, uchar &o_stall, BUSW &o_data);

        void    operator()(const uchar wb_cyc, const uchar wb_stb,

                                const uchar wb_we,

                        const BUSW wb_addr, const BUSW wb_data,

                                const uchar wb_sel,

                        uchar &o_ack, uchar &o_stall, BUSW &o_data) {

                apply(wb_cyc, wb_stb, wb_we, wb_addr, wb_data, wb_sel, o_ack, o_stall, o_data);

        }

        BUSW &operator[](const BUSW addr) { return m_mem[addr&m_mask]; }

};

#endif