Datasheet

Travelstar 80GN Hard Disk Drive Specification
56
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 36: I/O address map
CS0– CS1– DA2 DA1 DA0 DIOR– = 0 (Read) DIOW– = 0 (Write)
Command Block Registers
01000Data Reg. Data Reg.
01001Error Reg. Features Reg.
01010Sector count Reg. Sector count Reg.
01011LBA Low Reg LBA Low Reg
01100LBA Mid Reg LBA Mid Reg
01101LBA High Reg LBA High Reg
01110Device Reg Device Reg
01111Status Reg. Command Reg.
Control Block Registers
10110Alt. Status Reg. Device control Reg.
CS0– CS1– DA2 DA1 DA0 DIOR– = 0 (Read) DIOW– = 0 (Write)