IBM DTLA-305040 Hard Drive Specifications - Page 39

Interface logic signal levels, DSTROBE Ultra DMA

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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 the host and the device. DSTROBE is the data in 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. The termination resistors at the device side are implemented as follows: Device Termination (implemented on the drive side) Ÿ 33 Ω for DD0 thru DD15, DMARQ, INTRQ Ÿ 82 Ω for CS0-, CS1-, DA0, DA1, DA2, DIOR-, DIOW-, DMACKŸ 22 Ω for IORDY 7.1.3 Interface logic signal levels The interface logic signal has the following electrical specifications: Inputs Outputs Input High Voltage Input Low Voltage Output High Voltage Output Low Voltage 2.0 V min. 0.8 V max. 2.4 V min. 0.5 V max. Deskstar 40GV & 75GXP hard disk drive specifications 27

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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 the host and the device.
DSTROBE is the data in 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.
The termination resistors at the device side are implemented as follows:
Device Termination (implemented on the drive side)
°
33
Ω
for DD0 thru DD15, DMARQ, INTRQ
°
82
Ω
for CS0-, CS1-, DA0, DA1, DA2, DIOR-, DIOW-, DMACK-
°
22
Ω
for IORDY
7.1.3 Interface logic signal levels
The interface logic signal has the following electrical specifications:
0.5 V max.
Output Low Voltage
2.4 V min.
Output High Voltage
Outputs
0.8 V max.
Input Low Voltage
2.0 V min.
Input High Voltage
Inputs
Deskstar 40GV & 75GXP hard disk drive specifications
27