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ATAPI Interface Chapter 5
Seagate Travan 40 Product Manual Page 99
Host Taskfile Registers—Outputs
Data Bits
Host Taskfile
Register
7 6 5 4 3 2 1 0 HEX
Error rsvd tag type (not
supported)
MCH ABRT EOM ILI 00
Sector Count N/A N/A
Sector
Number
N/A N/A
Byte Count
High
residual byte count (15 : 8) 00
Byte Count
Low
residual byte count ( 7 : 0) 00
Device/Head rsvd LBA rsvd DEV SAM LUN (not used)
Status BSY RDY rsvd DSC DRQ Corr rsvd CHK 40 or 50
IDENTIFY PACKET DEVICE Data Returned to Host
Word(s)
Starting Offset
(hex)
Description of Contents
Value (hex)
0 00 General configuration bit-significant information:
15-14 10=ATAPI device
11=reserved
13 reserved
12-8 command packet set supported by the device
(01h = sequential access device)
7 1=removable media device
6-5 Method device uses when ready for Host to xfer
packet data
00=Microprocessor DRQ
(within 3 ms of receiving a PACKET command:
device shall set DRQ=1)
01=Interrupt DRQ
(sometime (no limit specified) after receiving
a PACKET command:
device shall assert INTRQ when DRQ=1
10=Accelerated DRQ
(within 50 microsecs of receiving a Packet
command: device shall set DRQ=1)
11=reserved
4-2 reserved
1-0 command packet size
00=12 byte command packet
01=16 byte command packet
1X=reserved
81C0
1-9 02 reserved 0000
10-19 14 Serial number (20 ASCII characters) varies
20-22 28 reserved 0000
23-26 2E Firmware revision (8 ASCII characters) varies
27-46 36 Model number (40 ASCII characters) “Seagate STT3401A”
47-48 5E reserved 0000