K6602743
Rev.2
02.12.’02
- 38 -
6.3.2.3.1 Identify Device [ECh]
The Identify Device command enables the host to receive parameter information from the device.
When the command is issued, the device sets BSY, stores the required parameter information in the
sector buffer, sets DRQ, and generates an interrupt. The host then reads the information from the
sector buffer through the Data Register. The parameter words are defined in Table 6.5 and 6.6.
All reserved bits or words shall be zero.
Table 6.5 Identify Device Information
Word Description
Value
(HEX.)
0 General
configuration
045Ah
1
Number of logical cylinders
See table 6.6
2 Specific
configuration
C837h
3
Number of logical heads
See table 6.6
4 – 5 Retired
0000h
6
Number of logical sectors per logical track
See table 6.6
7-9 Vendor
specific
10-19 Serial number (20 ASCII characters)
20 Retired
0003h
21 Retired
0400h
22 Number of ECC bytes passed on READ/WRITE LONG commands
0004h
23-26 Firmware revision(8 ASCII Characters)
27-46 Model number(40 ASCII Characters)
DK23EB-40: “HITACHI_DK23EB-40”
47 Number of sectors on multiple commands
Bit 15 - 8 80h (fixed)
Bit 7 - 0 Number of sectors on multiple command
8010h
48 Double word I/O not supported
0000h = cannot perform double word I/O
0001h = can perform double word I/O
0000h
49 Capabilities
Bit 15 – 14 0 = Reserved
Bit 13 1 = Standby timer values as specified in ATA-2
specification supported
Bit 12 0 = Reserved
Bit 11 1 = IORDY supported
Bit 10 1 = IORDY can be disabled
Bit 9 1 = LBA supported
Bit 8 1 = DMA supported
Bit 7 – 0 Vendor Specific
0B00h