Hitachi DK23DA-30F Owners Manual - Page 30

Hitachi DK23DA-30F - 30 GB Hard Drive Manual

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Signal name DASP- DMARQ DMACKJUMPER0,1,2 Pin 39 21 29 PIN-A,B,D I/O type I/O O I - Table 6.2 Signal List(3/3) Description 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. The device shall assert this signal, used for DMA data transfers between host and device, when it is ready to transfer data. 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. The I/O signal levels are as follows. (1) Input signal High level +2.0V to Vcc+0.5V Low level -0.5V to +0.8V (2) Output signal High level +2.4V to +5.25V or an open circuit Low level +0.4V or less (IOL=2mA), +0.5V or less (IOL=12mA) 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. K6602705 Rev.3 08.20.01 - 30 -

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K6602705
Rev.3
08.20.01
- 30 -
Table 6.2
Signal List(3/3)
Signal name
Pin
I/O type
Description
DASP-
39
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.
DMARQ
21
O
The device shall assert this signal, used for DMA data transfers
between host and device, when it is ready to transfer data.
DMACK-
29
I
The host in response to DMARQ to either acknowledge that data
has been accepted, or that data is available shall use this signal.
JUMPER0,1,2
PIN-A,B,D
-
See Sec. 4.3 “ Drive Address Setting (Drive 0/Drive 1)” for the detail.
The I/O signal levels are as follows.
(1) Input signal
High level
+
2.0V
to
Vcc
+
0.5V
Low
level
-
0.5V
to
+
0.8V
(2) Output signal
High level
+
2.4V to
+
5.25V or an open circuit
Low
level
+
0.4V or less (IOL=2mA),
+
0.5V or less (IOL=12mA)
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.