IBM DJSA-210 Hard Drive Specifications - Page 72

Addressing of HDD registers, Drive/Head Reg.

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7.12 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. Drive address Reg. Device control Reg. - Figure 47. I/O address map Travelstar 32GH/30GT/20GN hard disk drive specifications 58

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7.12 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.
–
Drive address Reg.
1
1
1
0
1
Device control Reg.
Alt. Status Reg.
0
1
1
0
1
Control Block Registers
Command Reg.
Status Reg.
1
1
1
1
0
Drive/Head Reg.
Drive/Head Reg.
0
1
1
1
0
Cylinder high Reg.
Cylinder high Reg.
1
0
1
1
0
Cylinder low Reg.
Cylinder low Reg.
0
0
1
1
0
Sector number Reg.
Sector number Reg.
1
1
0
1
0
Sector count Reg.
Sector count Reg.
0
1
0
1
0
Features Reg.
Error Reg.
1
0
0
1
0
Data Reg.
Data Reg.
0
0
0
1
0
Command Block Registers
–DIOW = 0 (Write)
–DIOR = 0 (Read)
DA00
DA01
DA02
–CS1
–CS0
Figure 47. I/O address map
Travelstar 32GH/30GT/20GN hard disk drive specifications
58