RASCSI/cpp/hal/bus.h

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//---------------------------------------------------------------------------
//
// X68000 EMULATOR "XM6"
//
// Copyright (C) 2001-2006 (ytanaka@ipc-tokai.or.jp)
// Copyright (C) 2014-2020 GIMONS
//
//---------------------------------------------------------------------------
#pragma once
#include "hal/data_sample.h"
#include "hal/pin_control.h"
#include "shared/config.h"
#include "shared/scsi.h"
#include <array>
#include <cstdint>
#include <memory>
#include <unordered_map>
#include <vector>
#include <stdexcept>
using namespace std;
//---------------------------------------------------------------------------
//
// Constant declarations (bus control timing)
//
//---------------------------------------------------------------------------
// SCSI Bus timings taken from:
// https://www.staff.uni-mainz.de/tacke/scsi/SCSI2-05.html
const static int SCSI_DELAY_ARBITRATION_DELAY_NS = 2400;
const static int SCSI_DELAY_ASSERTION_PERIOD_NS = 90;
const static int SCSI_DELAY_BUS_CLEAR_DELAY_NS = 800;
const static int SCSI_DELAY_BUS_FREE_DELAY_NS = 800;
const static int SCSI_DELAY_BUS_SET_DELAY_NS = 1800;
const static int SCSI_DELAY_BUS_SETTLE_DELAY_NS = 400;
const static int SCSI_DELAY_CABLE_SKEW_DELAY_NS = 10;
const static int SCSI_DELAY_DATA_RELEASE_DELAY_NS = 400;
const static int SCSI_DELAY_DESKEW_DELAY_NS = 45;
const static int SCSI_DELAY_DISCONNECTION_DELAY_US = 200;
const static int SCSI_DELAY_HOLD_TIME_NS = 45;
const static int SCSI_DELAY_NEGATION_PERIOD_NS = 90;
const static int SCSI_DELAY_POWER_ON_TO_SELECTION_TIME_S = 10; // (recommended)
const static int SCSI_DELAY_RESET_TO_SELECTION_TIME_US = 250 * 1000; // (recommended)
const static int SCSI_DELAY_RESET_HOLD_TIME_US = 25;
const static int SCSI_DELAY_SELECTION_ABORT_TIME_US = 200;
const static int SCSI_DELAY_SELECTION_TIMEOUT_DELAY_NS = 250 * 1000; // (recommended)
const static int SCSI_DELAY_FAST_ASSERTION_PERIOD_NS = 30;
const static int SCSI_DELAY_FAST_CABLE_SKEW_DELAY_NS = 5;
const static int SCSI_DELAY_FAST_DESKEW_DELAY_NS = 20;
const static int SCSI_DELAY_FAST_HOLD_TIME_NS = 10;
const static int SCSI_DELAY_FAST_NEGATION_PERIOD_NS = 30;
// The DaynaPort SCSI Link do a short delay in the middle of transfering
// a packet. This is the number of uS that will be delayed between the
// header and the actual data.
const static int SCSI_DELAY_SEND_DATA_DAYNAPORT_US = 100;
class bus_exception : public runtime_error
{
using runtime_error::runtime_error;
};
class BUS : public PinControl
{
public:
// Operation modes definition
enum class mode_e {
TARGET = 0,
INITIATOR = 1,
MONITOR = 2,
};
static int GetCommandByteCount(uint8_t);
virtual bool Init(mode_e mode) = 0;
virtual void Reset() = 0;
virtual void Cleanup() = 0;
phase_t GetPhase();
static phase_t GetPhase(int mci)
{
return phase_table[mci];
}
// Get the string phase name, based upon the raw data
static const char *GetPhaseStrRaw(phase_t current_phase);
virtual int GetMode(int pin) = 0;
virtual uint32_t Acquire() = 0;
virtual unique_ptr<DataSample> GetSample(uint64_t timestamp = 0) = 0;
virtual int CommandHandShake(vector<uint8_t> &) = 0;
virtual int ReceiveHandShake(uint8_t *buf, int count) = 0;
virtual int SendHandShake(uint8_t *buf, int count, int delay_after_bytes) = 0;
// SEL signal event polling
virtual bool PollSelectEvent() = 0;
// Clear SEL signal event
virtual void ClearSelectEvent() = 0;
virtual bool GetSignal(int pin) const = 0;
// Get SCSI input signal value
virtual void SetSignal(int pin, bool ast) = 0;
// Set SCSI output signal value
static const int SEND_NO_DELAY = -1;
// Passed into SendHandShake when we don't want to delay
private:
static const array<phase_t, 8> phase_table;
static const unordered_map<phase_t, const char *> phase_str_mapping;
};