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12.21.8.2 Counter Identifiers
Each counter begins with a 16-bit identifier. Table 146 defines the counter value for each identifier. Any unused counter
slots in the log page should have a counter identifier value of 0h.
Optional counters that are not implemented shall not be returned in log page 11h. A value of ‘0’ returned for a counter
means that there have been no instances of that particular event. There is no required ordering for event counters
within the log page; the order is arbitrary and selected by the device vendor.
For all counter descriptions, ‘transmitted’ refers to items sent by the device to the host and ‘received’ refers to items
received by the device from the host.
Bits 14:12 of the counter identifier convey the number of significant bits that counter uses. All counter values consume
a multiple of 16-bits. The valid values for bits 14:12 and the corresponding counter sizes are:
1h 16-bit counter
2h 32-bit counter
3h 48-bit counter
4h 64-bit counter
Any counter that has an identifier with bit 15 set to one is vendor specific. This creates a vendor specific range of
counter identifiers from 8000h to FFFFh. Vendor specific counters shall observe the number of significant bits 14:12
as defined above.
Table 146 Phy Event Counter Identifiers
Identifier
(Bits 11:0)
Mandatory/
Optional
Supported/
Not Supported
Description
000h
Mandatory
Supported
No counter value; marks end of counters in the page
001h
Mandatory
Supported
Command failed and ICRC bit set to one in Error register
002h
Optional
Supported
R_ERR response for Data FIS
003h
Optional
Supported
R_ERR response for Device-to-Host Data FIS
004h
Optional
Supported
R_ERR response for Host-to-Device Data FIS
005h
Optional
Supported
R_ERR response for Non-data FIS
006h
Optional
Supported
R_ERR response for Device-to-Host Non-data FIS
007h
Optional
Supported
R_ERR response for Host-to-Device Non-data FIS
008h
Optional
Not Supported
Device-to-Host non-Data FIS retries
009h
Optional
Supported
Transitions from drive PhyRdy to drive PhyNRdy
00Ah
Mandatory
Supported
Signature Device-to-Host Register FISes sent due to a
COMRESET
00Bh
Optional
Supported
CRC errors within a Host-to-Device FIS
00Dh
Optional
Supported
Non-CRC errors within a Host-to-Device FIS
00Fh
Optional
Not Supported
Not supported (R_ERR response for Host-to-Device Data FIS due
to CRC errors)
010h
Optional
Not Supported
R_ERR response for Host-to-Device Data FIS due to non-CRC
errors
012h
Optional
Not Supported
R_ERR response for Host-to-Device Non-data FIS due to CRC
errors
013h
Optional
Not Supported
R_ERR response for Host-to-Device Non-data FIS due to non-
CRC errors
12.21.8.2.1
Counter Definitions
The counter definitions in this section specify the events that a particular counter identifier represents.
12.21.8.2.2 Identifier 000h
There is no counter associated with identifier 000h. A counter identifier of 000h indicates that there are no additional
counters in the log page.
212
Hard Disk Drive Specification