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https://github.com/thewesker/RASCSI.git
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59 lines
1.2 KiB
C++
59 lines
1.2 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 "xm6.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 FASTCALL BUS::GetPhase()
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{
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DWORD mci;
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ASSERT(this);
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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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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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// Phase Table
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//
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//---------------------------------------------------------------------------
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const BUS::phase_t BUS::phase_table[8] = {
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dataout,
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datain,
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command,
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status,
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reserved,
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reserved,
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msgout,
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msgin
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};
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