IBM DARA-206000 Hard Drive Specifications - Page 49

Interface Logic Signal Levels - driver

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-DDMARDY (Ultra DMA) This signal is used only for Ultra D M A data transfers between host and drive. -DDMARDY is a flow control signal for Ultra D M A data out bursts. This signal is held asserted by the device to indicate to the host that the device is ready to receive Ultra D M A data out transfers. The device may negate -DDMARDY to pause an Uptra DMA data out transfer. 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. 6.3 Interface Logic Signal Levels The interface logic signal have the following electrical specifications: Inputs : Input High Voltage Input Low Voltage 2.0 V min./ Vcc+0.7 V max. 0.5 V min./ 0.8 V max. Outputs : Output High Voltage Output Low Voltage 2.4 V min. 0.5 V max. Current : Driver Sink Current Driver Source Current 24 mA min. 400 uA min. Electrical Interface Specifications 39

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-DDMARDY (Ultra DMA)
This signal is used only for Ultra DMA data transfers between host and drive.
-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 Uptra DMA data out
transfer.
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.
6.3
Interface Logic Signal Levels
The interface logic signal have the following electrical specifications:
Inputs
:
Input High Voltage
2.0 V min./ Vcc+0.7 V max.
Input Low Voltage
0.5 V min./ 0.8 V max.
Outputs :
Output High Voltage
2.4 V min.
Output Low Voltage
0.5 V max.
Current :
Driver Sink Current
24 mA min.
Driver Source Current
400 uA min.
Electrical Interface Specifications
39