Electrical computers and digital data processing systems: input/ – Input/output data processing – Input/output expansion
Patent
1998-03-23
2000-03-14
Lee, Thomas C.
Electrical computers and digital data processing systems: input/
Input/output data processing
Input/output expansion
710 2, 710102, 710103, G06F 1300
Patent
active
060386150
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an input/output device for connection and disconnection of active lines, and particularly to a device for connecting and disconnecting other electronic circuit devices to and from a network of signal circuits operating independently of an operating system bus, without causing the operation of the system bus to stop.
BACKGROUND OF THE INVENTION
In recent computer systems, in addition to high speed and high performance processing devices, there has also been a demand for improvements in the transfer rate of a system bus, which forms the transmission path for the results of processing. Also, accompanying the diversification of systems, there has been an increasing necessity to connect electronic circuits having various functions mainly to the system bus. The roles played by computer systems have become much more serious, and in order to maintain expansion devices, including the aforementioned electronic circuits, there is a tendency to not permit system stoppages, and so a need has arisen to connect or disconnect these expansion devices using active lines. On the other hand, in shared bus system type configurations, there is also a need for a way of settling the bus signal waveform quickly, for each expansion device, in order to achieve high speed operation.
Conventionally, as disclosed in Japanese Patent Laid-open Publication No. Hei 5-12777 (which will be referred to hereinafter as publication 1), there is a device in which power is supplied beforehand using a cord, etc., and in which disable control (open control) of bus drivers is carried out. As disclosed in Patent laid-open publication No. Hei 4-171520 (publication 2), a power supply and an open/close control line of a driver are connected to bus circuits by a long pin, while other bus signal lines are connected to the bus circuits by a short pin. At the time of insertion of a device, corruption of signals on the bus caused by the insertion is prevented by disabling the open/close signal line of the drivers in advance. However, in the device of publication 1, the procedure of connecting the cord beforehand at the time of insertion or removal is complicated, while of the device in publication 2 an open/close control line must be disabled beforehand. In either case, since it can not be guaranteed that the drivers will be disabled when insertion or removal is carried out carelessly, there is a possibility of problems arising, such as the system crashing, for instance.
SUMMARY OF THE INVENTION
An object of the present invention is to provide an input/output device which is capable of connecting and disconnecting active lines, and particularly to an input/output device in which the insertion or removal of expansion devices does not inhibit bus signal transfer of other electronic devices on a high speed bus due to a disabled state being maintained at the time of insertion or removal using transfer gates with a small signal delay in the input output device.
Another object of the present invention is to provide an input/output device which is capable of connecting and disconnecting active lines, and more particularly to an input/output device in which the internal power supply systems of expansion devices are multiplexed, the influence on power supplies is reduced at the time of inserting or removing expansion devices, at the same time as ensuring that the maintaining of high impedance of internal parts of the expansion devices, particularly the input/output devices, does not become unreliable, and in which the operation of electronic circuits not involved with insertion or removal does not become unreliable.
Still another object of the present invention is to provide a method, related to an input/output device, that can be applied to a high speed bus to rapidly settle the bus operating waveform by arranging for insertion of transfer gates at locations a fixed short distance from a bus at the input/output section of electronic circuits.
An input/output device of the present invention is connected to a plur
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patent: 4079440 (1978-03-01), Ohnuma et al.
patent: 5272584 (1993-12-01), Austruy et al.
patent: 5434752 (1995-07-01), Huth et al.
patent: 5530810 (1996-06-01), Bowman
patent: 5555510 (1996-09-01), Verseput
Kaminaga Yasuo
Kurosawa Kenichi
Masui Kouji
Ohashi Akihiro
Yamada Tsutomu
Hitachi , Ltd.
Lee Thomas C.
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