Command Protocol - Hitachi ic35l060avv207-0 - Deskstar 60 GB Hard Drive Specifications

10.0 Command Protocol

The commands are grouped into different classes according to the protocols followed for command
execution. The command classes with their associated protocols are defined below.
For all commands, the host must first check if BSY=1, and should proceed no further unless and until
BSY=0. For all commands, the host must also wait for RDY=1 before proceeding.
A device must maintain either BSY=1 or DRQ=1 at all times until the command is completed. The INTRQ
signal is used by the device to signal most, but not all, times when the BSY bit is changed from one to
zero during command execution.
A command shall only be interrupted with a hardware or software reset. The result of writing to the
Command register while BSY=1 or DRQ=1 is unpredictable and may result in data corruption. A com-
mand should only be interrupted by a reset at times when the host thinks there may be a problem, such
as a device that is no longer responding.
Interrupts are cleared when the host reads the Status Register, issues a reset, or writes to the Command
Register.
Figure 1 on page 229 shows the device time-out values.
Deskstar 180GXP hard disk drive specifications
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