ATA PIO Mode: Difference between revisions
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0x1F7 Command port / Regular Status port -- write commands / read status |
0x1F7 Command port / Regular Status port -- write commands / read status |
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</pre> |
</pre> |
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====Status Byte bit definitions:==== |
====Status Byte bit definitions:==== |
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<pre>Bit Abbreviation Function |
<pre>Bit Abbreviation Function |
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7 BSY Drive is preparing to accept/send data -- wait until this bit clears. If it never |
7 BSY Drive is preparing to accept/send data -- wait until this bit clears. If it never |
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clears, do a Software Reset. Technically, when BSY is set, the other bits in the |
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Status byte are meaningless. |
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6 RDY Bit is clear when drive is spun down, or after an error. Set otherwise. |
6 RDY Bit is clear when drive is spun down, or after an error. Set otherwise. |
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5 DF Drive Fault Error (does not set ERR!) |
5 DF Drive Fault Error (does not set ERR!) |
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4 SRV Overlapped Mode Service Request |
4 SRV Overlapped Mode Service Request |
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3 DRQ Set when the drive has PIO data to transfer, or is ready to accept PIO data. |
3 DRQ Set when the drive has PIO data to transfer, or is ready to accept PIO data. |
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0 ERR Error flag (when set). Send a new command to clear it (or nuke it with a Software |
0 ERR Error flag (when set). Send a new command to clear it (or nuke it with a Software |
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Reset). |
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</pre> |
</pre> |
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It is a Bad Idea to test the "Seek Complete" (DSC) bit -- it has been deprecated and reused for another purpose. |
It is a Bad Idea to test the "Seek Complete" (DSC) bit -- it has been deprecated and reused for another purpose. |
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