Hitachi DK23CA-10 - 10 GB Hard Drive Specifications page 30

Signal name Pin
DASP- 39
DMARQ 21
DMACK- 29
JUMPER0,1,2 PIN-A,B,D
The I/O signal levels are as follows.
(1) Input signal
(2) Output signal High level
Note) The I/F cable should be no longer than 50cm(20 inches) including the circuit pattern length in the host
system. If the cable length is not within this specification, it may cause factional degradations or some
errors.
K6602637
Rev.3
02.27.01
Table 6.2 Signal List(3/3)
I/O type
I/O This signal indicates that a device is active or that Drive 1 is present
when the power is turned on.
Upon receipt of a command from the host, the device asserts this
signal. At command completion, the device de-asserts this signal.
However, When a sequential read command is received from the
host, the device does not assert this signal.
O The device shall assert this signal, used for DMA data transfers
between host and device, when it is ready to transfer data.
I The host in response to DMARQ to either acknowledge that data
has been accepted, or that data is available shall use this signal.
- See Sec. 4.3 " Drive Address Setting (Drive 0/Drive 1)" for the detail.
+2.0V to
High level
-0.5V to
Low level
+2.4V to +5.25V or an open circuit
+0.4V or less (IOL=2mA), +0.5V or less (IOL=12mA)
Low level
Description
Vcc+0.5V
+0.8V
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