IBM DTTA-351010 Hard Drive Specifications - Page 31

Interface Logic Signal Levels

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DSTROBE (Ultra DMA) This signal is used only for Ultra D M A data transfers between host and drive. DSTROBE is the data int strobe signal from the device for an Ultra D M A data in transfer. Both the rising and 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. Note : The termination resistors at the device side are implemented as follows : Device Termination (implemented on H D D side) 33 ohm for DD0 thru DD15, DMARQ, INTRQ 82 ohm for -CS0, -CS1, DA00, DA01, DA02, -DIOR, DIOW, -DMACK 22 ohm for IORDY 6.1.3 Interface Logic Signal Levels The interface logic signal has the following electrical specifications: Inputs : Input High Voltage Input Low Voltage 2.0 V min. 0.8 V max. Outputs : Output High Voltage Output Low Voltage 2.4 V min. 0.5 V max. Specification 23

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DSTROBE (Ultra DMA)
This signal is used only for Ultra DMA data transfers between host and drive.
DSTROBE is the data int strobe signal from the device for an Ultra DMA data in transfer.
Both the rising and 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.
Note :
The termination resistors at the device side are implemented as follows :
Device Termination (implemented on HDD side)
33 ohm for DD0 thru DD15, DMARQ, INTRQ
82 ohm for -CS0, -CS1, DA00, DA01, DA02, -DIOR, DIOW, -DMACK
22 ohm for IORDY
6.1.3
Interface Logic Signal Levels
The interface logic signal has the following electrical specifications:
Inputs
:
Input High Voltage
2.0 V min.
Input Low Voltage
0.8 V max.
Outputs :
Output High Voltage
2.4 V min.
Output Low Voltage
0.5 V max.
Specification
23