IBM IC35L040AVVN07-0 Hard Drive Specifications - Page 38

CSEL Cable Select Optional, IORDY, DMACK, DMARQ, HDMARDY- Ultra DMA, HSTROBE Ultra DMA, STOP Ultra

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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) The drive is configured as either Device 0 or 1 depending upon the value of CSEL. ! If CSEL is grounded, the device address is 0. ! If CSEL is open, the device address is 1. 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 by mistake. IORDY This signal is negated to extend the host transfer cycle when a drive is not ready to respond to a data transfer request and may be negated when the host transfer cycle is less than 240 ns for PIO data transfer. 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. DMACK- This signal shall be used by the host in response to DMARQ to either acknowledge that data has been accepted or that data is available. This signal is internally pulled up to 5 V through a 15 KΩ resistor. The tolerance of the resistor value is -50% to +100%. DMARQ This signal, used for DMA data transfers between host and drive, shall be asserted by the drive when it is ready to transfer data to or from the host. The direction of data transfer is controlled by DIOR- and DIOW-. This signal is used on a handshake manner with DMACK-. This signal is a 3-state line with 24mA sink capability and internally pulled down to GND through 10 KΩ resistor. HDMARDY- (Ultra DMA) This signal is used only for Ultra DMA data transfers between the host and the device. HDMARDY- is a flow control signal for Ultra DMA data in bursts. This signal is held asserted by the host to indicate to the device that the host is ready to receive Ultra DMA data in transfers. The host may negate HDMARDY- to pause an Ultra DMA data in transfer. HSTROBE (Ultra DMA) This signal is used only for Ultra DMA data transfers between the host and the device. HSTROBE is the data out strobe signal from the host for an Ultra DMA data out transfer. Both the rising and falling edge of HSTROBE latch the data from DD(15:0) into the device. The host may stop toggling HSTROBE to pause an Ultra DMA data out transfer. STOP (Ultra DMA) This signal is used only for Ultra DMA data transfers between the host and the device. STOP shall be asserted by the host prior to initiation of an Ultra DMA burst. STOP shall be negated by the host before data is transferred in an Ultra DMA burst. Assertion of STOP by the host during or after data transfer in an Ultra DMA mode signals the termination of the burst. Deskstar 120GXP hard disk drive specifications 24

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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)
The drive is configured as either Device 0 or 1 depending upon the value of CSEL.
!
If CSEL is grounded, the device address is 0.
!
If CSEL is open, the device address is 1.
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 by mistake.
IORDY
This signal is negated to extend the host transfer cycle when a drive is not ready to
respond to a data transfer request and may be negated when the host transfer cycle is
less than 240 ns for PIO data transfer. 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.
DMACK-
This signal shall be used by the host in response to DMARQ to either acknowledge that
data has been accepted or that data is available.
This signal is internally pulled up to 5 V through a 15 K
Ω
resistor.
The tolerance of the
resistor value is –50% to +100%.
DMARQ
This signal, used for DMA data transfers between host and drive, shall be asserted by the
drive when it is ready to transfer data to or from the host. The direction of data transfer is
controlled by DIOR- and DIOW-. This signal is used on a handshake manner with
DMACK-. This signal is a 3-state line with 24mA sink capability and internally pulled down
to GND through 10 K
Ω
resistor.
HDMARDY- (Ultra DMA)
This signal is used only for Ultra DMA data transfers between the host and the device.
HDMARDY- is a flow control signal for Ultra DMA data in bursts. This signal is held
asserted by the host to indicate to the device that the host is ready to receive Ultra DMA
data in transfers. The host may negate HDMARDY- to pause an Ultra DMA data in
transfer.
HSTROBE (Ultra DMA)
This signal is used only for Ultra DMA data transfers between the host and the device.
HSTROBE is the data out strobe signal from the host for an Ultra DMA data out transfer.
Both the rising and falling edge of HSTROBE latch the data from DD(15:0) into the
device.
The host may stop toggling HSTROBE to pause an Ultra DMA data out transfer.
STOP (Ultra DMA)
This signal is used only for Ultra DMA data transfers between the host and the device.
STOP shall be asserted by the host prior to initiation of an Ultra DMA burst. STOP shall
be negated by the host before data is transferred in an Ultra DMA burst. Assertion of
STOP by the host during or after data transfer in an Ultra DMA mode signals the
termination of the burst.
Deskstar 120GXP hard disk drive specifications
24