mirror of
https://github.com/akuker/RASCSI.git
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94 lines
2.3 KiB
C++
94 lines
2.3 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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// [ SCSI Common Functionality ]
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//
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//---------------------------------------------------------------------------
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#include "os.h"
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#include "scsi.h"
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//---------------------------------------------------------------------------
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//
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// Phase Acquisition
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//
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//---------------------------------------------------------------------------
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BUS::phase_t BUS::GetPhase()
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{
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// Selection Phase
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if (GetSEL()) {
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return selection;
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}
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// Bus busy phase
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if (!GetBSY()) {
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return busfree;
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}
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// Get target phase from bus signal line
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DWORD mci = GetMSG() ? 0x04 : 0x00;
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mci |= GetCD() ? 0x02 : 0x00;
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mci |= GetIO() ? 0x01 : 0x00;
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return GetPhase(mci);
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}
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//---------------------------------------------------------------------------
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//
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// Determine Phase String phase enum
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//
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//---------------------------------------------------------------------------
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const char* BUS::GetPhaseStrRaw(phase_t current_phase){
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if(current_phase <= phase_t::reserved){
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return phase_str_table[current_phase];
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}
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else
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{
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return "INVALID";
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}
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}
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//---------------------------------------------------------------------------
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//
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// Phase Table
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// Reference Table 8: https://www.staff.uni-mainz.de/tacke/scsi/SCSI2-06.html
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// This determines the phase based upon the Msg, C/D and I/O signals.
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//
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//---------------------------------------------------------------------------
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const BUS::phase_t BUS::phase_table[8] = {
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// | MSG|C/D|I/O |
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dataout, // | 0 | 0 | 0 |
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datain, // | 0 | 0 | 1 |
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command, // | 0 | 1 | 0 |
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status, // | 0 | 1 | 1 |
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reserved, // | 1 | 0 | 0 |
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reserved, // | 1 | 0 | 1 |
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msgout, // | 1 | 1 | 0 |
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msgin // | 1 | 1 | 1 |
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};
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//---------------------------------------------------------------------------
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//
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// Phase Table
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// This MUST be kept in sync with the phase_t enum type!
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//
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//---------------------------------------------------------------------------
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const char* BUS::phase_str_table[] = {
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"busfree",
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"arbitration",
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"selection",
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"reselection",
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"command",
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"execute",
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"datain",
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"dataout",
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"status",
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"msgin",
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"msgout",
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"reserved"
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};
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