Hitachi IC25N040ATCS04-0 Specifications - Page 72
Addressing of HDD registers
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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 Control Block registers. The following table shows the I/ O address map. CS0- 0 0 0 0 0 0 0 0 1 1 CS1- 1 1 1 1 1 1 1 1 0 0 DA02 0 0 0 0 1 1 1 1 1 1 DA01 0 0 1 1 0 0 1 1 1 1 DA00 0 1 0 1 0 1 0 1 0 1 DIOR- = 0 (Read) DIOW- = 0 (Write) Command Block Registers Data Reg. Error Reg. Sector count Reg. Sector number Reg. Cylinder low Reg. Cylinder high Reg. Drive/Head Reg. Status Reg. Data Reg. Features Reg. Sector count Reg. Sector number Reg. Cylinder low Reg. Cylinder high Reg. Drive/Head Reg. Command Reg. Control Block Registers Alt. Status Reg. Device control Reg. Drive address Reg. - Figure 49. I/O address map Hitachi Travelstar 60GH & 40GN hard disk drive specifications 59