Quantum FIREBALL PLUS AS 20.5 Manual Pagina 105

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ATA Bus Interface and ATA Commands
Quantum Fireball Plus AS 10.2/20.5/30.0/40.0/60.0 GB AT 6-43
Table 6-19 defines the twelve bytes that make up the information for each threshold
entry in the device attribute thresholds data structure. Attribute entries in the
individual threshold data structure must be in the same order and correspond to the
entries in the individual attribute data structure.
The attribute ID numbers are vendor specific. Any non-zero value in the attribute
ID number indicates an active attribute.
Attribute threshold values are to be set at the factory and are not changeable in the
field.
The data structure checksum is the two’s compliment of the result of a simple eight-
bit addition of the first 511 bytes in the data structure.
Table 6-19
Table 6-19 Table 6-19
Table 6-19
Device Attribute Thresholds Data Structure
Table 6-20
Table 6-20 Table 6-20
Table 6-20 Individual Threshold Data Structure
Description
DescriptionDescription
Description Bytes
BytesBytes
Bytes Format
FormatFormat
Format Type
TypeType
Type
Data structure revision number = 0x0004h
for this revision
2 binary Rd only
1st attribute threshold 12 Rd only
.....
.....
.....
30th attribute threshold 12 Rd only
reserved (0x00) 18 Rd only
Vendor specific 131 Rd only
Data structure checksum 1 Rd only
Total bytes 512
Description
DescriptionDescription
Description Bytes
BytesBytes
Bytes Format
FormatFormat
Format Type
TypeType
Type
Attribute ID number 1 binary Rd only
Attribute threshold (for comparison with
attribute values from 0x00 to 0xFFh)
1 binary Rd only
0x00 “always passing” threshold value to
be used for
code test purposes
0x01 minimum value for normal operation
0xFD maximum value for normal operation
0xFE invalid for threshold value - not to be
used
0xFF “always failing” threshold value to be
used for code test purposes
Reserved 10 Rd only
Total bytes 12
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