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8.6.24 Words 85-87: Features/command sets enabled
Words 85, 86, and 87 shall indicate features/command sets enabled. The value 0000h or FFFFh was placed
in each of these words by Drives prior to ATA-4 and shall be interpreted by the host as meaning that
features/command sets enabled are not indicated. Bits 1 through 15 of word 86 are reserved. Bits 0-13 of
word 87 are reserved. Bit 14 of word 87 shall be set to one and bit 15 of word 87 shall be cleared to zero to
provide indication that the features/command sets enabled words are valid. The values in these words
should not be depended on by host implementers.
Bit 0 of word 85 shall be set to zero; the SMART feature set is not enabled.
If bit 1 of word 85 is set to one, the Security Mode feature set has been enabled via the Security
Set Password command.
Bit 2 of word 85 shall be set to zero; the Removable Media feature set is not supported.
Bit 3 of word 85 shall be set to one; the Power Management feature set is supported.
Bit 4 of word 85 shall be set to zero; the Packet Command feature set is not enabled.
If bit 5 of word 85 is set to one, write cache is enabled.
If bit 6 of word 85 is set to one, look-ahead is enabled.
Bit 7 of word 85 shall be set to zero; release interrupt is not enabled.
Bit 8 of word 85 shall be set to zero; Service interrupt is not enabled.
Bit 9 of word 85 shall be set to zero; the Device Reset command is not supported.
Bit 10 of word 85 shall be set to zero; the Host Protected Area feature set is not supported.
Bit 11 of word 85 is obsolete.
Bit 12 of word 85 shall be set to one; the Drive supports the Write Buffer command.
Bit 13 of word 85 shall be set to one; the Drive supports the Read Buffer command.
Bit 14 of word 85 shall be set to one; the Drive supports the NOP command.
Bit 15 of word 85 is obsolete.
Bit 0 of word 86 shall be set to zero; the Drive does not support the Download Microcode command.
Bit 1 of word 86 shall be set to zero; the Drive does not support the Read DMA Queued and Write
DMA Queued commands.
If bit 2 of word 86 shall be set to zero, the Drive does not support the CFA feature set.
If bit 3 of word 86 is set to one, the Advanced Power Management feature set has been enabled via
the Set Features command.
Bit 4 of word 86 shall be set to zero; the Drive does not support the Removable Media Status feature
set.
8.6.25 Word 88: True IDE Ultra DMA Modes Supported and Selected
Word 88 identifies the Ultra DMA transfer modes supported by the device and indicates the mode that is
currently selected. Only one DMA mode shall be selected at any given time. If an Ultra DMA mode is
selected, then no Multiword DMA mode shall be selected. If a Multiword DMA mode is selected, then no
Ultra DMA mode shall be selected. Support of this word is mandatory if Ultra DMA is supported. Word 88
shall return a value of 0 if the device is not in True IDE mode or if it does not support UDMA in True IDE
Mode.
Bit 15:
Bit 14: 1
Bit 13: 1
Bit 12: 1
Bit 11: 1
Bit 10: 1
Bit 9: 1
Bit 8: 1
Bit 7:
Bit 6: 1
Bit 5: 1
Bit 4: 1
Bit 3: 1
Bit 2: 1
Bit 1: 1
Bit 0: 1
Reserved
= Ultra DMA mode 6 is selected 0 = Ultra DMA mode 6 is not selected
= Ultra DMA mode 5 is selected 0 = Ultra DMA mode 5 is not selected
= Ultra DMA mode 4 is selected 0 = Ultra DMA mode 4 is not selected
= Ultra DMA mode 3 is selected 0 = Ultra DMA mode 3 is not selected
= Ultra DMA mode 2 is selected 0 = Ultra DMA mode 2 is not selected
= Ultra DMA mode 1 is selected 0 = Ultra DMA mode 1 is not selected
= Ultra DMA mode 0 is selected 0 = Ultra DMA mode 0 is not selected
Reserved
= Ultra DMA mode 6 and below are supported. Bits 0-5 shall be set to 1.
= Ultra DMA mode 5 and below are supported. Bits 0-4 shall be set to 1.
= Ultra DMA mode 4 and below are supported. Bits 0-3 shall be set to 1.
= Ultra DMA mode 3 and below are supported, Bits 0-2 shall be set to 1.
= Ultra DMA mode 2 and below are supported. Bits 0-1 shall be set to 1.
= Ultra DMA mode 1 and below are supported. Bit 0 shall be set to 1.
= Ultra DMA mode 0 is supported
Swissbit AG
Industriestrasse 4
Swissbit reserves the right to change products or specifications without notice.
Revision: 1.00
CH-9552 Bronschhofen
Switzerland
www.swissbit.com
industrial@swissbit.com
P-120_data_sheet_PA-QxBO_Rev100.doc
Page 45 of 76
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