Hitachi ic35l060avv207-0 - Deskstar 60 GB Hard Drive Specifications page 37

Address used to select the individual register in the drive.
DA0-DA2
Chip select signal generated from the Host address bus. When active, one of the
CS0-
Command Block Registers (Data, Error {Features when written}, Sector Count, Sector
Number, Cylinder Low, Cylinder High, Drive/Head and Status {Command when written}
register) can be selected. (See Figure 43 on page 38.)
Chip select signal generated from the Host address bus. When active one of the Control
CS1-
Block Registers (Alternate Status {Device Control when written} and Drive Address
register) can be selected. (See Figure 43 on page 38.)
This line is used to reset the drive. It shall be kept in Low logic state during power up and
RESET-
in High thereafter.
Its rising edge holds data from the host data bus to a register or data register of the drive.
DIOW-
When low, this signal enables data from a register or data register of the drive onto data
DIOR-
bus. The data on the bus shall be latched on the rising edge of DIOR-.
Interrupt is enabled only when the drive is selected and the host activates the nIEN bit in
INTRQ
the Device Control Reg. Otherwise, this signal is in high impedance state regardless of
the state of the IRQ bit. The interrupt is set when the IRQ bit is set by the drive CPU. IRQ
is reset to zero by a host read of the status register or a write to the Command Reg. This
signal is a 3-State line with 24 mA sink capability.
This is a time-multiplexed signal which indicates that a drive is active, or that device 1 is
DASP-
present. This signal is driven by Open-Drain driver and internally pulled up to 5 volts
through a 10kΩ resistor.
During Power-On initialization or after RESET- is negated, DASP- shall be asserted by
Device 1 within 400 ms to indicate that device 1 is present. Device 0 shall allow up to
450 ms for device 1 to assert DASP-. If device 1 is not present, device 0 may assert
DASP- to drive a LED indicator.
DASP- shall be negated following acceptance of the first valid command by device 1. At
anytime after negation of DASP-, either drive may assert DASP- to indicate that a drive is
active.
PDIAG- shall be asserted by device 1 to indicate to device 0 that it has completed diag-
PDIAG-
nostics. This line is pulled-up to 5 volts in the drive through a 10kΩ resistor.
Following a Power On Reset, software reset, or RESET-, drive 1 shall negate PDIAG-
within 1 ms (to indicate to device 0 that it is busy). Drive 1 shall then assert PDIAG-
within 30 seconds to indicate that it is no longer busy and is able to provide status.
Following the receipt of a valid Execute Drive Diagnostics command, device 1 shall
negate PDIAG- within 1 ms to indicate to device 0 that it is busy and has not yet passed
its drive diagnostics. If device 1 is present, device 0 shall wait up to 6 seconds from the
receipt of a valid Execute Drive Diagnostics command for drive 1 to assert PDIAG-.
Device 1 should clear BSY before asserting PDIAG-, as PDIAG- is used to indicate that
device 1 has passed its diagnostics and is ready to post status.
If device 1 did not assert DASP- during reset initialization, device 0 shall post its own
status immediately after it completes diagnostics and clear the device 1 Status register to
00h. Device 0 may be unable to accept commands until it has finished its reset procedure
and is ready (DRDY=1).
Device 1 shall release PDIAG-/CBLID- no later than after the first command following a
power on or hardware reset sequence so that the host may sample PDIAG-/CBLID- in
order to detect the presence or absence of an 80-conductor cable assembly.
CSEL (Cable Select) (Optional)
Deskstar 180GXP hard disk drive specifications
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