Hitachi 7K500 500GB HTS725050A9A364 User Manual
Product codes
HTS725050A9A364
7K500 OEM Specification
Page 114 of 176
The Data Structure Checksum (Byte 511) contains the 2’s complement of the sum of the first 511
bytes in the data structure. The sum of all 512 bytes of the data structure will be zero when the
checksum is correct.
bytes in the data structure. The sum of all 512 bytes of the data structure will be zero when the
checksum is correct.
14.17.5
14.17.5
14.17.5
14.17.5
Phy Event Counter
Phy Event Counter
Phy Event Counter
Phy Event Counter
Phy Event Counters are a feature to obtain more information about Phy level events that occur on
the interface. The counter values are not retained across power cycles. The counter values are
preserved across COMRESET and software resets.
the interface. The counter values are not retained across power cycles. The counter values are
preserved across COMRESET and software resets.
14.17.5.1
14.17.5.1
14.17.5.1
14.17.5.1
Counter Reset Mecha
Counter Reset Mecha
Counter Reset Mecha
Counter Reset Mechanisms
nisms
nisms
nisms
There are 2 mechanisms by which the host can explicitly cause the Phy counters to be reset. The
first mechanism is to issue a BIST Activate FIS to the drive. The second mechanism uses the Read
Log Ext command. When the drive receives a Read Log Ext command for log page 11h and bit 0 in
Feature register is set to one, the drive returns the current counter values for the command and then
resets all Phy event counter values.
first mechanism is to issue a BIST Activate FIS to the drive. The second mechanism uses the Read
Log Ext command. When the drive receives a Read Log Ext command for log page 11h and bit 0 in
Feature register is set to one, the drive returns the current counter values for the command and then
resets all Phy event counter values.
14.17.5.2
14.17.5.2
14.17.5.2
14.17.5.2
Counter Identifiers
Counter Identifiers
Counter Identifiers
Counter Identifiers
Each counter begins with a 16-bit identifier. The following table defines the counter value for each
identifier.
identifier.
For all counter descriptions, “transmitted” refers to items sent by the drive to the host and “received”
refers to items received by the drive from the host.
refers to items received by the drive from the host.
Bits 14:12 of the counter identifier convey the number of significant bits that counter uses. All
counter values consumes a multiple of 16-bits. The valid values for bit 14:12 and the corresponding
counter size are:
counter values consumes a multiple of 16-bits. The valid values for bit 14:12 and the corresponding
counter size are:
1h
16-bit counter
2h
32-bit counter
3h
48-bit counter
4h
64-bit counter
Identifier
(Bits 11:0)
Description
000h
No counter value; marks end of counters in the page
001h
Command failed due to ICRC error
009h
Transfer from drive PhyRdy to drive PhyNRdy
00Ah
Signature D2H register FISes sent due to a COMRESET
00Bh
CRC errors within the FIS (received)
00Dh
Non-CRC errors within the FIS (received)
Table 82 Phy Event Counter Identifier
14.17.5.3
14.17.5.3
14.17.5.3
14.17.5.3
Read Log Ext Log Page 11h
Read Log Ext Log Page 11h
Read Log Ext Log Page 11h
Read Log Ext Log Page 11h
The following table defines the format of
the Phy Event counter data structure.