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Travelstar 7K100 Hard Disk Drive Specification
52
7.11 Addressing of HDD registers
The host addresses the drive through a set of registers called a Task File. These registers are mapped into the host's
I/O space. Two chip select lines (CS0- and CS1-) and three address lines (DA00–02) are used to select one of these
registers, while a DIOR- or DIOW- is provided at the specified time.
The chip select line CS0- is used to address the Command Block registers while the CS1- is used to address Con-
trol Block registers.
The following table shows the I/ O address map.
Table 37: I/O address map
CS0-
CS1-
DA02-
DA01
DA00
DIOR- = 0 (Read)
DIOW- = 0 (Write)
Command Block Registers
0
1
0
0
0
Data Reg.
Data Reg.
0
1
0
0
1
Error Reg.
Features Reg.
0
1
0
1
0
Sector count Reg.
Sector count Reg.
0
1
0
1
1
LBA low Reg.
LBA low Reg.
0
1
1
0
0
LBA mid Reg.
LBA mid Reg.
0
1
1
0
1
LBA high Reg.
LBA high Reg.
0
1
1
1
0
Device Reg.
Device Reg.
0
1
1
1
1
Status Reg.
Command Reg.
Control Block Registers
1
0
1
1
0
Alt. Status Reg.
Device control Reg.
1
0
1
1
1
Drive address Reg.
–
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