Patent EP0831390A1 successfully refreshed from Google Patents.
EP0831390A1
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EP
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I/o expansion device and apparatus using the same
Assignee: Individual
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Filing: 1996-03-05
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Granted: —
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Expires: 2016-03-05
Abstract
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. <IMAGE>
Inventors
- 👤 Tadahiko Hisano
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 09:39
CPC Classifications
G; G06; G06F; G06F13/00; G06F13/38; G06F13/42; G06F13/4265; G06F13/4269; G06F13/382; G06F13/385
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
227 words
I/O expantion device which enables to expand inputs and
outputs of a personal computer by connecting it to a parallel
interface of the personal computer; comprizing a connector for connecting to a parallel interface,
and an I/O expansion circuit connected to the connector and
having data input to input four or five bit data in the first
register equivalent to data register in the parallel interface,
data output to output for bit data to the second register
equivalent to status register in the parallel interface, and
control input to input the signal from the third register
equivalent to control register a parallel interface; and sein I/O expansion circuit has plural four bit
input/output ports and a four bit data bus for transfering data
between these input/output ports and data input or data output,
and outputs four bit data read provided from the data input to
one of the input/output ports or outputs four bit data provided
from one of the input/output ports to the data output according
to the control from the control input to connect the I/O
expansion device correspond to claim 1 of this aplication to the
parallel interface of a personal computer, inputs and outputs of
the personal computer can be expanded by sellecting one of the
input/output ports according to the control the control input
and read and write the selected input/output port.
Claim 2
Dependent Claim
46 words
An I/O expansion device in claim 1 charactorized in
inputting commands for selecting sein input/output ports setting
operation mode and data for outputting sein selected
input/output port from sein daya input, or provides status of
sein selected input/output port to sein second register via sein
connector.
Claim 3
Dependent Claim
113 words
An I/O expansion device in claim 2 charactorized in sein 4-bit
data bus is bidirectional, sein I/O expansion circuit comprises a first 4-bit bus buffer for providing status of sein data
input to sein data output in accordance with state of one of
signals provided to sein control input, and an IO expander connected to sein data bus and controled by
other of signals provided to sein control input, wherein sein IO expander inputs sein command in state
transition of the strobe, outputs the data provided through sein
data bus when state of thestrobe is returned, and provides
status of sein input/output port selected by sein command when
the command is read command.
Claim 4
Dependent Claim
35 words
An I/O expansion device in claim 2 charactorized in having
a decoder to decode outputs from sein third register or sein
first register and that operation of respectively IO expander is
controled by sein decoder.
Claim 5
Dependent Claim
32 words
An I/O expansion device in claim 2 charactorized in that
remaining bits of sein first register provided from sein
connecter is connected to a power supply line of sein I/O
expansion device.
Claim 6
Dependent Claim
26 words
An I/O expansion device in claim 2 charactorized in
additionally having a power monitor circuit for monitoring
whether the voltage of the power line is favorable.
Claim 7
Dependent Claim
35 words
An I/O expansion device in claim 2 charactorized in
additionally having a gate for providing interupt signal to sein
coputer body through sein parallel interface with logical
addition with sein input/output ports used for input.
Claim 8
Dependent Claim
31 words
An I/O expansion device in claim 2 charactorized in that
logical addition with respective input/output ports used for
input is provided other ports used for input in sein I/O
expansion circuit.
Claim 9
Dependent Claim
198 words
An I/O expansion circuit having plurarity of 4-bit
input/output ports, a control input for inputting a signal to
control operation of the circuit, a data input for inputting a
command for read/write of one of sein input/output ports
selected and a data output for outputting status of one of sein
input/output ports as 4-bit data, and comprizing: a write data bus for transiferring 4-bit data from sein data
input to sein input/output port, a read data bus for transiferring 4-bit data from sein
input/output port to sein data input, resisters provided respectively for sein input/output port for
outputting status of sein write data bus by fetching the
sutatus, a control for fetching the command for selection of sein
input/output ports and setting of operation mode in transition
of status of strobe in sein control input, wherein sein control circuit outputs status of selected
input/output ports via sein buffer and sein read data bus when
the fetched command is read mode, makes 4-bit data provided to
sein data input in returning of state of the strobe via sein
write data bus in sein register of sein input/output ports to be
fetched and to be output from sein input/output port.
Claim 10
Dependent Claim
171 words
A external storage device which has a memory for storing
data, and provides data stored in sein memory to a personal
computer via sein parallel interface by connecting sein personal
computer or can store data from sein personal computer in sein
memory, comprising: a connector for connecting to sein parallel inface, an I/O expansion circuit connected to sein connector having a
data input for inputting four or five bit data in the first
register equivalent to data register in the parallel interface,
a data output for outputting for bit data to the second register
equivalent to status register in the parallel interface, and
control input for inputting the signal from the third register
equivalent to control register a parallel interface, wherein sein I/O expansion circuit has 4-bit input/output port
connected to address pins, data pins and a pin for control,
outputs 4-bit data provided from sein data input to one of sein
sein input/output ports, or outputs 4-bit data provided from one
of sein sein input/output ports to sein data output.
Claim 11
Dependent Claim
67 words
A external storage device in claim 10 characterized in that
sein I/O expansion circuit inputs a command for selection of
sein input/output port and setting operation mode and data for
outputting the selected input/output port from sein data input
in transition of a strobe that is one of signals provided to
sein control, or provides status of sein selected port to sein
second register via sein connector.
Claim 12
Dependent Claim
36 words
A external storage device in claim 10 characterized in that
sein memory is one of a ROM, a static memory, an EEPROM, a
dynamic memory, and a memory accessible by means of operation
equivalent to above.
Claim 13
Dependent Claim
68 words
A external storage device in claim 10 characterized in that
one of input/output ports of sein I/O expansion circuit is
connected to a switch for identification of sein memory and a
pin for write control of sein memory, and is connected to one or
all of a switch disable to write and a switch for identification
that access of sein memory is whether DRAM type or SRAM type.
Claim 14
Dependent Claim
154 words
A method for access to an external storage device in claim
10 for reading data in a memory of sein external storage device
by means connecting to a parallel interface of a personal
computer and writing data into a data register and a control
registers of sein personal computer, comprizing: putting one connected to data pins of sein memory among
input/output ports of sein I/O expantion circuit into read mode, setting address to write sein memory to one connected to
address pins of sein memory among input/output ports of sein I/O
expantion circuit, outputting data written at the address from sein memory by
means of writing 4-bit data to one connected to pins for control
of sein memory among input/output ports of sein I/O expantion
circuit, reading data output from one connected to data pins of sein
memory among input/output ports of sein I/O expantion circuit
with a status register of the personal computer.
Claim 15
Dependent Claim
139 words
A method for access to an external storage device in claim
1 for writing data in a memory of sein external storage device
by means connecting to a parallel interface of a personal
computer and writing data into a data register and a control
registers of sein personal computer, comprizing: setting address to write sein memory to one connected to
address pins of sein memory among input/output ports of sein I/O
expantion circuit, setting data to write sein memory to one connected to data pins
of sein memory among input/output ports of sein I/O expantion
circuit, carring out operation of read sein memory at the address by
means of writing 4-bit data in sequence into one connected to
pins for control of sein memory among input/output ports of sein
I/O expantion circuit, and wirting the data into sein memory.
Claim 16
Dependent Claim
68 words
A I/O extension device in claim 1 charactorized in that
sein I/O expansion circuit, wherein write/read of sein
input/output port is controlled, outputs 4-bit data from sein
input/output by writing 4-bit data provided from sein data input
to sein input/output ports selected by remaining three bits in
sein control input or outputs 4-bit data provided to sein
input/output ports selected by remaining three bits in sein
control input.
Claim 17
Dependent Claim
179 words
A I/O extension device in claim 16 charactorized in sein
I/O expansion circuit having 4-bit write bus for transferring 4-bit
data provided from sein data input to sein selected
input/output port, 4-bit read bus for transferring 4-bit data
provided to the selected input/output ports to sein data output,
input/output circuits installed for respective input/output
ports for providing 4-bit data from sein 4-bit writ bus or for
transferring 4-bit data provided to sein input/output to sein 4-bit
read bus, and a decoder for selecting one of sein
input/output circuits and enabling operation, wherein sein input/output circuit holds 4-bit data provided
from sein data input, outputs sein 4-bit data from sein
input/output ports when sein one bit indicates write status of
sein input/output ports and a signal for selecting sein
input/output ports from sein decoder exists, outputs 4-bit data provided from sein input/output ports to
sein 4-bit read bus when sein one bit indicates read status of
sein input/output ports and a signal for selecting sein
input/output ports from sein decoder exists, and outputs sein 4-bit data from sein 4-bit data.
Claim 18
Dependent Claim
58 words
A computer having a parallel interface characterizing in a
program for access to an external storage device as a drive
having a memory and an I/O extention circuit exchangable at
least 4-bit data between sein parallel interface and sein memory
when sein external storage is connected to sein parallel
interface is written into a ROM of sein computer.
Claim 19
Dependent Claim
42 words
A computer in claim 18 charactrized in that at start up
sein computer read out program or data in sein external storage
connected to sein parallel interface by means of a program
written in the sein ROM and carry out sein program.
Claim 20
Dependent Claim
21 words
A computer in claim 18 characterized in that sein external
device is designed to be a cartridge of sein computer body.
Claim 21
Dependent Claim
97 words
A computer having a microcontroller formed a parallel
interface able to input and output at least 4-bit data and a ROM
storing a program to operation sein microcontroller, where sein parallel is connectable to a storage device having a
memory and an I/O expansion circuit able to exchange at least 4-bit
data between sein parallel interface and sein memory, and selection of address and control of sein memory through
sein I/O expansion circuit exchange of data at desired address
of sein memory through sein I/O expansion circuit are carried
out by a program written in sein ROM.
References Cited (Backward Citations)
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