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Annotation of nono/vm/opm.h, revision 1.1.1.5

1.1       root        1: //
                      2: // nono
                      3: // Copyright (C) 2020 nono project
                      4: // Licensed under nono-license.txt
                      5: //
                      6: 
1.1.1.4   root        7: //
                      8: // OPM (YM2151)
                      9: //
                     10: 
1.1       root       11: #pragma once
                     12: 
                     13: #include "device.h"
1.1.1.5 ! root       14: #include "event.h"
1.1       root       15: 
1.1.1.3   root       16: class OPMDevice : public IODevice
1.1       root       17: {
                     18:        using inherited = IODevice;
1.1.1.4   root       19: 
1.1       root       20:        static const int baseaddr = 0xe90000;
1.1.1.5 ! root       21:        static const uint64 clk = 250_nsec;             // 4MHz
1.1       root       22: 
                     23:  public:
                     24:        OPMDevice();
                     25:        virtual ~OPMDevice() override;
                     26: 
1.1.1.5 ! root       27:        void ResetHard(bool poweron) override;
        !            28: 
1.1       root       29:  protected:
                     30:        // BusIO インタフェース
                     31:        static const uint32 NPORT = 2;
1.1.1.2   root       32:        uint64 Read(uint32 offset);
                     33:        uint64 Write(uint32 offset, uint32 data);
                     34:        uint64 Peek(uint32 offset);
1.1.1.4   root       35: 
                     36:  private:
1.1.1.5 ! root       37:        bool IsBusy() const;
        !            38: 
1.1.1.4   root       39:        int reg {};             // アクセスレジスタ番号
1.1.1.5 ! root       40: 
        !            41:        uint64 busy_origin;             // BUSY の起点時刻
        !            42:        uint64 busy_start;              // BUSY のアサート開始時刻
        !            43:        uint64 busy_end;                // BUSY のアサート終了時刻
1.1       root       44: };
                     45: 
1.1.1.4   root       46: extern OPMDevice *gOPM;

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