IBM DJSA-210 Hard Drive Specifications - Page 59

V Power, DMACK, DMARQ, HDMARDY Ultra DMA, HSTROBE Ultra DMA, burst. Assertion

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5V Power There are two input pins for the +5 V power supply. One is the "+5 V Logic" input pin and the second is the "+5 V Motor" input pin. These two input pins are tied together within the drive. -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 Volt through a 15 kΩ resistor with a resistor tolerance value of -50% to +100%. DMARQ This signal is used for DMA data transfers between the host and drive. It 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 -HIOR and -HIOW signals. This signal is used in a handshake mode with -DMACK. This signal is a 3-state line with 24 mA sink capability and internally pulled down to GND through a 10 kΩ resistor. -HDMARDY (Ultra DMA) This signal is used only for Ultra DMA data transfers between host and drive. The signal -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 host and drive. The signal 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 host and drive. The STOP signal shall be asserted by the host prior to initiation of an Ultra DMA burst. A 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. -DDMARDY (Ultra DMA) This signal is used only for Ultra DMA data transfers between host and drive. The signal -DDMARDY is a flow control signal for Ultra DMA data out bursts. This signal is held asserted by the device to indicate to the host that the device is ready to receive Ultra DMA data out transfers. The device may negate -DDMARDY to pause an Ultra DMA data out transfer. DSTROBE (Ultra DMA) This signal is used only for Ultra DMA data transfers between host and drive. The signal DSTROBE is the data in strobe signal from the device for an Ultra DMA data in transfer. Both the rising and the falling edge of DSTROBE latch the data from DD (15:0) into the host. The device may stop toggling DSTROBE to pause an Ultra DMA data in transfer. Travelstar 32GH/30GT/20GN hard disk drive specifications 45

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5V Power
There are two input pins for the +5 V power supply. One is the "+5 V Logic" input pin and the second
is the "+5 V Motor" input pin. These two input pins are tied together within the drive.
-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 Volt through a 15 k
Ω
resistor with a resistor tolerance value of
–50% to +100%.
DMARQ
This signal is used for DMA data transfers between the host and drive.
It 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
-HIOR and -HIOW signals. This signal is used in a handshake mode with -DMACK. This signal is a
3-state line with 24 mA sink capability and internally pulled down to GND through a 10 k
Ω
resistor.
-HDMARDY (Ultra DMA)
This signal is used only for Ultra DMA data transfers between host and drive.
The signal -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 host and drive.
The signal 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 host and drive.
The
STOP
signal shall be asserted by the host prior to initiation of an Ultra
DMA
burst.
A 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.
-DDMARDY (Ultra DMA)
This signal is used only for Ultra DMA data transfers between host and drive.
The signal -DDMARDY is a flow control signal for Ultra DMA data out bursts. This signal is held
asserted by the device to indicate to the host that the device is ready to receive Ultra DMA data out
transfers. The device may negate -DDMARDY to pause an Ultra DMA data out transfer.
DSTROBE (Ultra DMA)
This signal is used only for Ultra DMA data transfers between host and drive.
The signal DSTROBE is the data in strobe signal from the device for an Ultra DMA data in transfer.
Both the rising and the falling edge of DSTROBE latch the data from DD (15:0) into the host. The
device may stop toggling DSTROBE to pause an Ultra DMA data in transfer.
Travelstar 32GH/30GT/20GN hard disk drive specifications
45