Hitachi IC25N040ATCS04-0 - Travelstar 40GN 40GB UDMA/100 4200RPM 2MB 2.5" IDE Hard Drive Specifications page 59

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 signal shall be asserted by the host prior to initiation of an Ultra
STOP
negated by the host before data is transferred in an Ultra
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 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.
DMA
Hitachi Travelstar 60GH & 40GN hard disk drive specifications
burst. Assertion of
DMA
mode signals the termination of the burst.
46
burst. shall be
DMA A STOP
by the host
STOP