IBM IC35L020 - Deskstar 20 GB Hard Drive - Interface Logic Signal Levels; Reset Timings; Figure 23. Interface Logic Signal Level Electrical Specifications; Figure 24. System Reset Timing

DDMARDY- (Ultra DMA)
This signal is used only for Ultra DMA data transfers between the host and the 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 Ultra
DMA data out transfer.
DSTROBE (Ultra DMA)
This signal is used only for Ultra DMA data transfers between the host and the drive.
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 DD00–DD15 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 the drive side)
y
33
Ω
for DD00–DD15, IORDY
y
82
Ω
for CS0-, CS1-, DA0, DA1, DA2, DIOR-, DIOW-, DMACK-
y
22
Ω
for DMARQ and INTRQ
9.1.3 Interface logic signal levels
The interface logic signal has the following electrical specifications:
0.5 (Max.)Output Low Voltage
2.4 (Min.)Output High Voltage
Outputs
0.8 (Max.)Input Low Voltage
2.0 (Min.)Input High Voltage
Inputs
Voltage Logic level designations
Figure 23. Interface logic signal level electrical specifications
9.1.4 Reset timings
Drive reset timing.
t10
t14
RESET-
BUSY
31–RESET high to not BUSY
t14
–25RESET low width
t10
Maximum
(s)
Minimum
(s)
Parameter descriptionTime duration
Figure 24. System reset timing
Deskstar 60 GXP Hard disk drive specification
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