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If this field is supported, bit 1 of word 53 shall be set to one. The value in word 66 shall not be less than the
value in word 65. This field shall be supported by all Drives supporting DMA modes 1 and above. If bit 1 of
word 53 is set to one, but this field is not supported, the Drive shall return a value of zero in this field.
8.6.21 Word 67: Minimum PIO transfer cycle time without flow control
Word 67 of the parameter information of the Identify Device command is defined as the minimum PIO
transfer without flow control cycle time. This field defines, in nanoseconds, the minimum cycle time that, if
used by the host, the Drive guarantees data integrity during the transfer without utilization of flow control.
If this field is supported, Bit 1 of word 53 shall be set to one.
Any Drive that supports PIO mode 3 or above shall support this field, and the value in word 67 shall not be
less than the value reported in word 68.
If bit 1 of word 53 is set to one because a Drive supports a field in words 64-70 other than this field and the
Drive does not support this field, the Drive shall return a value of zero in this field.
8.6.22 Word 68: Minimum PIO transfer cycle time with IORDY
Word 68 of the parameter information of the Identify Device command is defined as the minimum PIO
transfer with IORDY flow control cycle time. This field defines, in nanoseconds, the minimum cycle time that
the Drive supports while performing data transfers while utilizing IORDY flow control.
If this field is supported, Bit 1 of word 53 shall be set to one.
Any Drive that supports PIO mode 3 or above shall support this field, and the value in word 68 shall be the
fastest defined PIO mode supported by the Drive.
If bit 1 of word 53 is set to one because a Drive supports a field in words 64-70 other than this field and the
Drive does not support this field, the Drive shall return a value of zero in this field.
8.6.23 Words 82-84: Features/command sets supported
Words 82, 83, and 84 shall indicate features/command sets supported. The value 0000h or FFFFh was placed
in each of these words by Drives prior to ATA-3 and shall be interpreted by the host as meaning that
features/command sets supported are not indicated. Bits 1 through 13 of word 83 and bits 0 through 13 of
word 84 are reserved. Bit 14 of word 83 and word 84 shall be set to one and bit 15 of word 83 and word 84
shall be cleared to zero to provide indication that the features/command sets supported words are valid.
The values in these words should not be depended on by host implementers.
Bit 0 of word 82 shall be set to zero; the SMART feature set is not supported.
If bit 1 of word 82 is set to one, the Security Mode feature set is supported.
Bit 2 of word 82 shall be set to zero; the Removable Media feature set is not supported.
Bit 3 of word 82 shall be set to one; the Power Management feature set is supported.
Bit 4 of word 82 shall be set to zero; the Packet Command feature set is not supported.
If bit 5 of word 82 is set to one, write cache is supported.
If bit 6 of word 82 is set to one, look-ahead is supported.
Bit 7 of word 82 shall be set to zero; release interrupt is not supported.
Bit 8 of word 82 shall be set to zero; Service interrupt is not supported.
Bit 9 of word 82 shall be set to zero; the Device Reset command is not supported.
Bit 10 of word 82 shall be set to zero; the Host Protected Area feature set is not supported.
Bit 11 of word 82 is obsolete.
Bit 12 of word 82 shall be set to one; the Drive supports the Write Buffer command.
Bit 13 of word 82 shall be set to one; the Drive supports the Read Buffer command.
Bit 14 of word 82 shall be set to one; the Drive supports the NOP command.
Bit 15 of word 82 is obsolete.
Bit 0 of word 83 shall be set to zero; the Drive does not support the Download Microcode command.
Bit 1 of word 83 shall be set to zero; the Drive does not support the Read DMA Queued and Write
DMA Queued commands.
Bit 2 of word 83 shall be set to zero; the Drive does not support the CFA feature set.
If bit 3 of word 83 is set to one, the Drive supports the Advanced Power Management feature set.
Bit 4 of word 83 shall be set to zero; the Drive does not support the Removable Media Status feature
set.
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 44 of 76
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