ATA-ATAPI (IDE)

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ATA-ATAPI (IDE)

New postby Bud » Wed Jul 07, 2004 2:34 pm

ATA-ATAPI is the specification defining the interface to a variety of storage devices, including hard-disks, CD-ROM drives, SD and SM cards, Compact Flash, and probably a few others yet to come (since there are still some type numbers reserved). This thread will contain a few notes on ATA/ATAPI that I help me understand it. The full text of the spec (and the last several versions) is available at:

http://www.t13.org/

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Transfer Modes

New postby Bud » Wed Jul 07, 2004 2:49 pm

The only place where I have seen the data transfer modes and the data rates asociated in the ATA-ATAPI spec is in an appendix (annex) entry on signal integrety. (If anybody has located a convenient table, please tell me.) So, I'm creating a table here.

Code: Select all
PIO Modes:

Mode               MB/s
0                  3.3
1                  5.2
2                  8.3
3                  11.1
4                  16.7

DMA Modes (Multiword):

Mode                MB/s
0                   4.2
1                   13.3
2                   16.7

Ultra DMA Modes:

Mode                MB/s    Marketing Name
0                   16.7
1                   25.0    Ultra-DMA 25
2                   33.3    Ultra-DMA 33
3                   44.4
4                   66.7    Ultra-DMA 66
5                   100     Ultra-DMA 100
6                   133     Ultra-DMA 133

Source: ATA-ATAPI v7 spec (http://www.t13.org/docs2004/d1532v1r4b%20ATA-ATAPI-7.pdf, Annex E, E1 Introduction)

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New postby Bud » Tue Jul 12, 2005 4:44 pm

Here's a good white paper from Hitachi on DMA with ATA/IDE drives:

http://www.hitachigst.com/tech/techlib.nsf/techdocs/DFE76984029D3BE586256FAB0058B1A8

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