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109 lines
4.0 KiB
C++
109 lines
4.0 KiB
C++
//---------------------------------------------------------------------------
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//
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// X68000 EMULATOR "XM6"
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//
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// Copyright (C) 2001-2006 ＰＩ．(ytanaka@ipc-tokai.or.jp)
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// Copyright (C) 2014-2020 GIMONS
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//
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//---------------------------------------------------------------------------
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#pragma once
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#include "hal/data_sample.h"
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#include "hal/pin_control.h"
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#include "shared/config.h"
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#include "shared/scsi.h"
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#include <array>
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#include <cstdint>
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#include <memory>
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#include <unordered_map>
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#include <vector>
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#include <stdexcept>
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using namespace std;
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//---------------------------------------------------------------------------
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//
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// Constant declarations (bus control timing)
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//
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//---------------------------------------------------------------------------
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// SCSI Bus timings taken from:
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// https://www.staff.uni-mainz.de/tacke/scsi/SCSI2-05.html
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const static int SCSI_DELAY_ARBITRATION_DELAY_NS = 2400;
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const static int SCSI_DELAY_ASSERTION_PERIOD_NS = 90;
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const static int SCSI_DELAY_BUS_CLEAR_DELAY_NS = 800;
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const static int SCSI_DELAY_BUS_FREE_DELAY_NS = 800;
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const static int SCSI_DELAY_BUS_SET_DELAY_NS = 1800;
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const static int SCSI_DELAY_BUS_SETTLE_DELAY_NS = 400;
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const static int SCSI_DELAY_CABLE_SKEW_DELAY_NS = 10;
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const static int SCSI_DELAY_DATA_RELEASE_DELAY_NS = 400;
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const static int SCSI_DELAY_DESKEW_DELAY_NS = 45;
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const static int SCSI_DELAY_DISCONNECTION_DELAY_US = 200;
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const static int SCSI_DELAY_HOLD_TIME_NS = 45;
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const static int SCSI_DELAY_NEGATION_PERIOD_NS = 90;
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const static int SCSI_DELAY_POWER_ON_TO_SELECTION_TIME_S = 10; // (recommended)
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const static int SCSI_DELAY_RESET_TO_SELECTION_TIME_US = 250 * 1000; // (recommended)
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const static int SCSI_DELAY_RESET_HOLD_TIME_US = 25;
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const static int SCSI_DELAY_SELECTION_ABORT_TIME_US = 200;
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const static int SCSI_DELAY_SELECTION_TIMEOUT_DELAY_NS = 250 * 1000; // (recommended)
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const static int SCSI_DELAY_FAST_ASSERTION_PERIOD_NS = 30;
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const static int SCSI_DELAY_FAST_CABLE_SKEW_DELAY_NS = 5;
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const static int SCSI_DELAY_FAST_DESKEW_DELAY_NS = 20;
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const static int SCSI_DELAY_FAST_HOLD_TIME_NS = 10;
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const static int SCSI_DELAY_FAST_NEGATION_PERIOD_NS = 30;
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// The DaynaPort SCSI Link do a short delay in the middle of transfering
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// a packet. This is the number of uS that will be delayed between the
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// header and the actual data.
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const static int SCSI_DELAY_SEND_DATA_DAYNAPORT_NS = 100'000;
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class bus_exception : public runtime_error
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{
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using runtime_error::runtime_error;
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};
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class BUS : public PinControl
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{
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public:
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// Operation modes definition
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enum class mode_e {
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TARGET = 0,
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INITIATOR = 1
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};
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static int GetCommandByteCount(uint8_t);
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virtual bool Init(mode_e mode) = 0;
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virtual void Reset() = 0;
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virtual void Cleanup() = 0;
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phase_t GetPhase();
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static phase_t GetPhase(int mci)
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{
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return phase_table[mci];
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}
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// Get the string phase name, based upon the raw data
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static const char *GetPhaseStrRaw(phase_t current_phase);
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virtual uint32_t Acquire() = 0;
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virtual unique_ptr<DataSample> GetSample(uint64_t timestamp = 0) = 0;
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virtual int CommandHandShake(vector<uint8_t> &) = 0;
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virtual int ReceiveHandShake(uint8_t *buf, int count) = 0;
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virtual int SendHandShake(uint8_t *buf, int count, int delay_after_bytes) = 0;
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// SEL signal event polling
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virtual bool PollSelectEvent() = 0;
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virtual bool GetSignal(int pin) const = 0;
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// Get SCSI input signal value
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virtual void SetSignal(int pin, bool ast) = 0;
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// Set SCSI output signal value
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static const int SEND_NO_DELAY = -1;
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// Passed into SendHandShake when we don't want to delay
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private:
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static const array<phase_t, 8> phase_table;
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static const unordered_map<phase_t, const char *> phase_str_mapping;
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};
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