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US 6,445,700 B1Granted
Serial communication circuit
AssigneeOki Electric Industry Co., Ltd.
InventorsAtsushi Yusa, Mitsuya Ohie
Life of this patent
Estimating the term…
Abstract
A serial communication circuit sends or receives a large amount of data speedily. A buffer 2a is connected to a serial interface circuit 1a, and a buffer 2b is connected to a serial interface circuit 1b. One end of a switch 4 is connected to the serial interface circuit 1a or the serial interface circuit 1b, and another end to a serial port 3. Switching the switch 4 sequentially to the serial interface circuit 1a and to the serial interface circuit 1b makes it possible to use the two buffers for sending data to, or receiving data from, one serial port 3.
Claims12
A serial communication circuit comprising:
- a plurality of serial interface circuits for serial data communication, each serial interface circuit including a shift register for serial/parallel conversion;
- a plurality of send-receive buffers, each connected to one of said plurality of serial interface circuits on a one-to-one basis, said buffers connected to a parallel bus, for storing communication data sent or received by said plurality of serial interface circuits, said buffers storing said communication data in parallel form;
- a serial port through which serial data is sent to or received from said plurality of serial interface circuits;
- and
- a switch which selectively connects said plurality of serial interface circuits to said serial port.
2 more elements
A serial communication circuit comprising:
- a plurality of serial ports through which serial data is sent or received;
- a plurality of serial interface circuits for serial data communication, each serial interface circuit connected to one of said serial ports on a one-to-one basis;
- a plurality of buffers for storing communication data for use by said plurality of serial interface circuits, said buffers connected to a parallel bus;
- a plurality of connection on/off switches, each connected to one of said plurality of serial interface circuits on a one-to-one basis, for turning on or off a connection between one of said plurality of serial interface circuits and one of said plurality of buffers;
- and
- a plurality of buffer selection switches, placed between said plurality of buffers and said plurality of connection on/off switches and each connected to one of said plurality of connection on/off switches on a one-to-one basis, for selectively connecting said plurality of buffers to said plurality of connection on/off switches.
3 more elements
A serial communication circuit comprising:
- a plurality of serial ports through which serial data is sent or received;
- a plurality of serial interface circuits for serial data communication, each serial interface circuit connected to one of said serial ports on a one-to-one basis;
- a plurality of buffers for storing communication data sent to, or received from, said plurality of serial interface circuits, said buffer s connect ed to a parallel bus;
- a buffer selection switch which is placed between one of said plurality of serial interface circuits and said plurality of buffers and which selectively connects said plurality of buffers to one of said plurality of serial interface circuits;
- and
- a connection on/off switch which connects one or more serial interface circuits, not connected to said buffer selection switch, to one of said plurality of buffers on a one-to-one basis, for turning on or off a connection between one of said serial interface circuits and one of said plurality buffers.
3 more elements
A serial communication circuit comprising:
- a serial interface circuit for serial data communication coupled to a parallel bus;
- a plurality of serial ports one of which is connected directly to said serial interface circuit;
- and
- an on/off switch, with one end connected to said serial interface circuit and with the other end connected to one of said serial ports not directly connected to said serial interface circuit, for turning on or off a connection between said serial interface circuit and one of said serial ports.
1 more element
A serial communication circuit comprising:
- a serial interface circuit for serial data communication coupled to a parallel bus;
- a plurality of serial ports one of which is connected directly to said serial interface circuit;
- and
- a plurality of on/off switches, each with one end connected to said serial interface circuit and with the other end connected, on a one-to-one basis, to one of said plurality of serial ports not directly connected to said serial interface circuit, for turning on or off a connection between said serial interface circuit and said plurality of serial ports.
1 more element
A serial communication circuit comprising:
- a serial interface circuit for serial data communication coupled to a parallel bus;
- a plurality of serial ports;
- a serial interface circuit connection switch which is connected, on a one-to-one basis, to said serial interface circuit and which turns on or off a connection between the serial interface circuit and said plurality of serial ports;
- and
- a plurality of serial port connection switches which are placed between said serial interface circuit connection switch and said plurality of serial ports and are connected, on a one-to-one basis, to said plurality of serial ports and which turn on or off a connection between said serial interface circuit connection switch and each of said plurality of serial ports.
2 more elements
A serial communication circuit comprising:
- a plurality of serial interface circuits for serial data communication, said serial interface circuits coupled to a parallel bus;
- a plurality of serial ports;
- a plurality of serial interface circuit connection switches which are connected, on a one-to-one basis, to said plurality of serial interface circuits and which turn on or off a connection between each serial interface circuit and said plurality of serial ports;
- and
- a plurality of serial port connection switches, one serial port connection switch being provided for each of said serial interface circuit connection switches and for each of said serial ports, and which turn on or off a connection between each of said serial interface circuit connection switches and each serial port.
2 more elements
Dependencies are inferred from the claim text.