Table 26 I/O Address Map - Hitachi CinemaStar P7K500 Specifications

5.2.5 Addressing of registers
The host addresses the drive through a set of registers called the Task File. These registers are mapped into
the I/ O space of the host. Two chip select lines (CS0– and CS1–) and three address lines (DA0-02) are
used to select one of these registers, while a DIOR– or DIOW– is provided at the specified time.
The CS0– is used to address Command Block registers. while the CS1– is used to address Control Block
registers.
The following table shows the I/ O address map.
CS0– CS1– DA2 DA1
0 1 0
0 1 0
0 1 0
0 1 0
0 1 1
0 1 1
0 1 1
0 1 1
1 0 1

Table 26 I/O address map

Note: "Addr" field is shown as an example.
During DMA operation (from writing to the command register until an interrupt) not all registers are
accessible. For example, the host is not supposed to read status register contents before interrupt (the
value is invalid).
5.2.6 Cabling
The maximum cable length from the host system to the drive plus circuit pattern length in the host system
shall not exceed 18 inches.
For higher data transfer application (>8.3 MB/s) a modification in the system design is recommended to
reduce cable noise and cross-talk, such as a shorter cable, bus termination, or a shielded cable.
For systems operating with Ultra DMA mode 3, 4, and 5, 80-conductor ATA cable assembly shall be used.
HITACHI Deskstar & CinemaStar P7K500 Hard Disk Drive specification (Rev 1.1)
DA0 DIOR– = 0 (Read)
0 0 Data Reg.
0 1 Error Reg.
1 0 Sector count Reg.
1 1 Sector number Reg.
0 0 Cylinder low Reg.
0 1 Cylinder high Reg.
1 0 Device/Head Reg.
1 1 Status Reg.
1 0 Alt. Status Reg.
34
DIOW– = 0 (Write)
Command Block Registers
Data Reg.
Features Reg.
Sector count Reg.
Sector number Reg.
Cylinder low Reg.
Cylinder high Reg.
Device/Head Reg.
Command Reg.
Control Block Registers
Device control Reg.