IBM IC25N020ATDA04 - Travelstar 20 GB Hard Drive Specifications page 64

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 Ultra DMA data out transfers.
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 effect a pause in Ultra DMA data out transfers.
STOP (Ultra DMA)
This signal is used only for Ultra DMA data transfers between host and drive.
The signal shall be asserted by the host prior to initiation of an Ultra
STOP
be negated by the host before data is transferred in an Ultra
host during or after data transfer in an Ultra
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 effect a pause in Ultra DMA data out transfers.
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 effect a pause in an Ultra DMA data in transfer.
Travelstar 48GH, 30GN & 15GN hard disk drive specifications
burst. Assertion of
DMA
mode signals the termination of the burst.
DMA
50
burst. shall
DMA A STOP
by the
STOP