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// license:BSD-3-Clause
// copyright-holders:Olivier Galibert
/*********************************************************************
Apple SWIM2 floppy disk controller
*********************************************************************/
#ifndef MAME_MACHINE_SWIM2_H
#define MAME_MACHINE_SWIM2_H
#pragma once
#include "applefdintf.h"
#include "fdc_pll.h"
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
class swim2_device : public applefdintf_device
{
public:
// construction/destruction
swim2_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
virtual u8 read(offs_t offset) override;
virtual void write(offs_t offset, u8 data) override;
virtual void set_floppy(floppy_image_device *floppy) override;
virtual floppy_image_device *get_floppy() const override;
virtual void sync() override;
protected:
virtual void device_start() override ATTR_COLD;
virtual void device_reset() override ATTR_COLD;
private:
enum {
M_MARK = 0x100,
M_CRC = 0x200,
M_CRC0 = 0x400
};
floppy_image_device *m_floppy;
u8 m_param[4];
u8 m_mode, m_setup, m_error, m_param_idx, m_fifo_pos, m_tss_sr, m_tss_output, m_current_bit;
u16 m_fifo[2], m_sr;
u16 m_crc, m_mfm_sync_counter;
u32 m_half_cycles_before_change;
u64 m_last_sync;
u64 m_flux_write_start;
std::array<u64, 32> m_flux_write;
u32 m_flux_write_count;
fdc_pll_t m_pll;
u64 time_to_cycles(const attotime &tm) const;
attotime cycles_to_time(u64 cycles) const;
void fifo_clear();
bool fifo_push(u16 data);
u16 fifo_pop();
void flush_write(u64 when = 0);
void show_mode() const;
void crc_update(int bit);
void crc_clear();
void update_dat1byte();
};
DECLARE_DEVICE_TYPE(SWIM2, swim2_device)
#endif /* MAME_MACHINE_SWIM2_H */
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