External storage device and method of accessing the same
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United States of America Patent
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May 11, 2004
Grant Date -
Mar 6, 2003
app pub date -
Jul 18, 2002
filing date -
Mar 6, 1995
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An I/O expansion device for additional inputs and outputs, and an apparatus and a methed for applying this device. The device includes a connector (CN1) for the connection with a parallel port, a plurality of 4-bit input/output ports, and an I/O expansion circuit (100) having a 4-bit data bus for data transfer between a plurality of 4-bit input/output ports and the connector. The I/O expansion circuit (100) includes a control input CTRL including a strobe PROG for controlling fetch of the command for selecting the input/output ports and an operation mode, a data input DIN that recieves a command in accordance with the state transition of the strobe PROG and data to be transferred to the input/output port selected by the command, and a data output DOUT for giving the state of the selected port through the connector.
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