IBM DJSA-210 Hard Drive Specifications - Page 58

IOCS16, PDIAG, CSEL Cable Select, IORDY - driver

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-IOCS16 A signal indicating to the host that a 16-bit wide data register has been addressed and that the drive is prepared to send or receive a 16-bit wide data word. This signal is an Open-Drain output with 24 mA sink capability and an external resistor is needed to pull this line to 5 volts. -DASP This is a time-multiplexed signal which indicates that a drive is active or that device 1 is present. This signal is driven by an Open-Drain driver and internally pulled up to 5 volts through a 10 kΩ resistor. During a 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 an LED indicator. The -DASP signal shall be negated following acceptance of the first valid command by device 1. Anytime after negation of -DASP, either drive may assert -DASP to indicate that a drive is active. -PDIAG This signal shall be asserted by device 1 to indicate to device 0 that it has completed the diagnostics. This line is pulled up to 5 volts in the HDD through a 10 kΩ 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 then 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 -DASP was not asserted by device 1 during reset initialization, device 0 shall post its own status immediately after it completes diagnostics and clears 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). CSEL (Cable Select) This signal is monitored to determine the drive address (master or slave) when the jumper on the interface connector is at Position-3. When CSEL is at ground or is at a low level the HDD works as a Master. If CSEL is open or is at a logical high level the HDD works as a Slave. The signal level of CSEL to one HDD should be different from the signal level to another HDD on the same AT interface cable to avoid master-master or slave-slave configurations. KEY Pin position 20 has no connection pin. It is recommended to close the respective position of the cable connector in order to avoid incorrect insertion. IORDY This signal is an indication to the host that the drive is ready to complete the current I/O cycle. This line is driven low at the falling edge of -DIOR or -DIOW when HDD needs some additional WAIT cycle(s) to extend the PIO cycle. This line can be connected to the host IORDY signal in order to insert a WAIT state(s) into the host PIO cycle. This signal is an Open-Drain output with 24 mA sink capability. Travelstar 32GH/30GT/20GN hard disk drive specifications 44

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-IOCS16
A signal indicating to the host that a 16-bit wide data register has been addressed and that the drive is
prepared to send or receive a 16-bit wide data word. This signal is an Open-Drain output with 24 mA
sink capability and an external resistor is needed to pull this line to 5 volts.
-DASP
This is a time-multiplexed signal which indicates that a drive is active or that device 1 is present. This
signal is driven by an Open-Drain driver and internally pulled up to 5 volts through a 10 k
Ω
resistor.
During a 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 an LED indicator. The
-DASP signal shall be negated following acceptance of the first valid command by device 1. Anytime
after negation of -DASP, either drive may assert -DASP to indicate that a drive is active.
-PDIAG
This signal shall be asserted by device 1 to indicate to device 0 that it has completed the diagnostics.
This line is pulled up to 5 volts in the HDD through a 10 k
Ω
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 then 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 -DASP was not asserted by device 1 during reset initialization, device 0 shall post its own
status immediately after it completes diagnostics and clears 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).
CSEL (Cable Select)
This signal is monitored to determine the drive address (master or slave) when the jumper on the
interface connector is at Position-3.
When CSEL is at ground or is at a low level the HDD works as a Master. If CSEL is open or is at a
logical high level the HDD works as a Slave.
The signal level of CSEL to one HDD should be different from the signal level to another HDD on the
same AT interface cable to avoid master-master or slave-slave configurations.
KEY
Pin position 20 has no connection pin. It is recommended to close the respective position of the cable
connector in order to avoid incorrect insertion.
IORDY
This signal is an indication to the host that the drive is ready to complete the current I/O cycle. This
line is driven low at the falling edge of -DIOR or -DIOW when HDD needs some additional WAIT
cycle(s) to extend the PIO cycle. This line can be connected to the host IORDY signal in order to
insert a WAIT state(s) into the host PIO cycle. This signal is an Open-Drain output with 24 mA sink
capability.
Travelstar 32GH/30GT/20GN hard disk drive specifications
44