Synchronous/asynchronous data communication arrangement

A transmitter unit of a digital communication system and arranged to multiplex an asynchronous binary data input signal with a synchronous binary data input signal such that the binary transition timing of said asynchronous binary data input signal is preserved during the transmission of a data word from said transmitter unit

• CHARACTERIZED IN THAT
• said transmitter comprises:
• means for transmitting said synchronous data input signal as a binary data word,
• means for detecting a binary transition in said asynchronous binary input signal and for generating an output signal in response thereto,
• means for timing a transmission of said data word a fixed amount of times after the reception of said output signal from said detector means, and
• means connected to said transmitting means for inserting an extra data bit in said transmitted data word in response to said output signal, said extra bit representing said binary transition timing of said asynchronous binary data input signal transmission to said receiver unit.

A communication system including a transmitter unit and a receiver unit, said transmitter unit arranged to multiplex an asynchronous binary data input signal with a synchronous binary data input signal for transmission as a data word to said receiver unit such that the binary transition timing of said asynchronous binary data input signal is preserved after demultiplexing by said receiver unit

• CHARACTERIZED IN THAT
• said transmitter comprises:
• means for transmitting at timed intervals said synchronous data input signal as a binary data word having a fixed number of data bits,
• means for detecting a binary transition in said asynchronous binary data input signal, and
• means controlled by said detecting means for both adjusting a next one of said timed intervals and for inserting an extra data bit in a next one of said transmitted data word.

A communication system including a transmitter unit and a receiver unit, said transmitter unit arranged to multiplex an asynchronous binary data input signal with a synchronous binary data input signal for transmission as a data word to said receiver unit such that the binary transition timing of said asynchronous binary data input signal is preserved after demultiplexing by said receiver unit

• CHARACTERIZED IN THAT
• said transmitter comprises:
• means for transmitting said synchronous data input signal as a binary data word,
• means for both detecting a binary transition in said asynchronous binary data input signal and for generating a control signal in response thereto,
• means for timing a transmission of said data word a fixed amount of time after the reception of said control signal from said detector means, and
• means connected to said transmitting means for inserting an extra data bit in said transmitted data word in response to said control signal, said extra bit representing said binary transition timing of said asynchronous binary data input signal during transmission to said receiver unit.

A transmitter unit for use in a communication system, said transmitter unit arranged to concurrently transmit synchronous and asynchronous data

• CHARACTERIZED IN THAT
• said transmitter unit comprises:
• means for accepting a synchronous binary data input signal;
• means for accepting an asynchronous binary data input signal;
• means connected to said asynchronous data accepting means for generating an output signal in response to the detection of a transition in the binary state of said asynchronous data input signal;
• and
• means connected to said synchronous accepting means, asynchronous accepting means and said generating means for transmitting data, said transmitting means including
• means for synchronously transmitting data from said synchronous accepting means in the absence of said output signal from said generating means, and
• means for asynchronously transmitting a combined data signal from said synchronous accepting means and said asynchronous accepting means in response to said output signal from said generating means such that the timing between consecutive asynchronous transmissions represent the timing of the transitions in said asynchronous data input signal.

A communication system including a transmitter unit and a receiver unit, said transmitter unit arranged to combine an asynchronous and a synchronous binary input signal for communication as a data word to said receiver unit

• CHARACTERIZED IN THAT
• said transmitter unit of said communication system comprises:
• means for accepting a synchronous binary data input signal;
• means for accepting an asynchronous binary data input signal;
• means connected to said asynchronous data accepting means for generating an output signal in response to the detection of a transition in the binary state of said asynchronous data input signal;
• and
• means connected to said synchronous accepting means, asynchronous accepting means and said generating means for transmitting data, said transmitting means including
• means for synchronously transmitting data from said synchronous accepting means in the absence of said output signal from said generating means, and
• means for asynchronously transmitting a combined data signal from said synchronous accepting means and said asynchronous accepting means in response to said output signal from said generating means such that the timing between consecutive asynchronous transmissions represent the timing of the transitions in said asynchronous data input signal.

A transmitter unit for use in a digital communication system, said unit arranged to combine synchronous and asynchronous binary data signals for transmission over a connected data facility such that the binary transition information of said asynchronous binary data signal is preserved during transmission

• CHARACTERIZED IN THAT
• said transmitter unit comprises:
• means for accepting a synchronous binary data signal;
• means for accepting an asynchronous binary data signal;
• means connected to said asynchronous data accepting means for generating an output signal in response to the direction of a transition in the binary state of said asynchronous data signal;
• means for providing a binary clock signal, said clock arranged to resynchronize in response to an output signal from said generating means;
• a variable counter means connected to said clock signal means and said generating means, said counter means arranged to cyclically count said clock signals to a first count level in the absence of an output signal from said generating means, said counter means arranged to reset and count to a higher second count level in response to said output signal from said generating means;
• and
• means connected to said synchronous data means, said asynchronous data means and said variable counter means for gating data signals as a data word for transmission over said facility wherein said gating means includes
• means for gating said synchronous binary signal during counts of said counter means up to said first count level, and
• means for gating said asynchronous binary signal during subsequent counts higher than said first count level until said counter means reaches said second count level.

A communication system including a transmitter unit and a receiver unit, said transmitter unit arranged to combine an asynchronous and a synchronous binary input signal for communication as a data word to said receiver unit such that the binary transition information of said asynchronous signal is preserved when decoded by said receiver unit

• CHARACTERIZED IN THAT
• said transmitter unit comprises:
• means for accepting a synchronous binary data signal;
• means for accepting an asynchronous binary data signal;
• means connected to said asynchronous data accepting means for generating an output signal in response to the detection of a transition in the binary state of said asynchronous data signal;
• means for providing a binary clock signal, said clock arranged to resynchronize in response to an output signal from said generating means;
• a variable counter means connected to said clock signal means and said generating means, said counter means arranged to cyclically count said clock signals to a first count level in the absence of an output signal from said generating means, said counter means arranged to reset and count to a higher second count level in response to said output signal from said generating means;
• and
• means connected to said synchronous data means, said asynchronous data means and said variable counter means for gating data signals as a data word for communication over said facility wherein said gating means includes
• means for gating said synchronous binary signal during counts of said counter means up to said first count level, and
• means for gating said asynchronous binary signal during subsequent counts higher than said first count level until said counter means reaches said second count level.

A communication system including a transmitter unit and a receiver unit, said transmitter unit arranged to multiplex an asynchronous and a synchronous binary input signal for communication as a data word to said receiver unit, said communication system

• CHARACTERIZED IN THAT
• said transmitter unit of said communication system includes
• means for transmitting at timed intervals said synchronous data input signal as a binary data word having a fixed number of data bits,
• means for detecting a binary transition in said asynchronous binary data input signal, and
• means controlled by said detecting means for both adjusting a next one of said timed intervals and for inserting an extra data bit in a next one of said transmitted data words;
• and
• said receiver unit of said communication system includes
• means for determining an increase in the number of bits in a received multiplexed data word, and
• means controlled by said determining means for demultiplexing said received multiplexed data into a synchronous data part and an asynchronous data part such that said asynchronous data is provided at an output a fixed time period after the beginning of reception of said received multiplexed data words.

A receiver unit for use in a communication system, said receiver arranged to receive an asynchronous multiplexed data word including one part consisting of a fixed number of bits of synchronous data and another part consisting of a fixed number of bits of asynchronous data

• CHARACTERIZED IN THAT
• said receiver unit comprises:
• means for determining an increase in the number of bits in a received asynchronous multiplexed data word, and
• means controlled by said determining means for demultiplexing said received asynchronous multiplexed data into said synchronous data part and asynchronous data part such that said asynchronous data is provided at an output a fixed time period after the beginning of reception of said received multiplexed data word.

In a circuit, a method of multiplexing an asynchronous binary data input signal with a synchronous binary data input signal for transmission as part of a data word which preserves the timing of said asynchronous binary data input signal, the method comprising the steps of:

• (a) transmitting said synchronous data at timed intervals as a binary data word having a fixed number of bits;
• (b) detecting a binary transition in said asynchronous data input signal;
• (c) adjusting the timed intervals of the transmission of the binary data word of step (a) to have a fixed time relationship to the timing of the detection of the binary transition of step (b);
• and
• (d) inserting an extra data bit in the transmission of the binary data word of step (a) in response to the detection of the binary transition of step (b).

In a data transmission circuit a method of multiplexing a data bit of an asynchronous digital data input signal with a data bit of a synchronous digital data input signal for transmission as part of a data word which preserves the timing of said asynchronous data signal, the method comprising the steps of:

• (a) counting a clock signal in a cyclic counter which determines the number of bits of each transmitted data word;
• (b) gating said synchronous data bits as part of the data word;
• (c) generating an output signal indicating the transition of said asynchronous binary data signal;
• (d) resetting the clock and cyclic counter in response to the output signal to step (a);
• (e) increasing the counting range of the cyclic counter of step (a) in response to the output signal of step (c);
• and
• (f) gating the asynchronous extra data bit as part of the lengthened data word creased by the increased counting range of step (e).

In a data transmission system a method of transmitting an asynchronous binary data input signal with a synchronous binary data input signal for transmission as part of a data word which preserves the timing of said asynchronous binary data input signal, the method comprising the steps of:

• (a) transmitting said synchronous data at timed intervals as a binary data word having a fixed number of bits;
• (b) detecting the binary transition in said asynchronous data input signal;
• (c) adjusting the timed intervals of the transmission of the binary data word of step (a) to have a fixed time relationship to the timing of the detection of the binary transition of step (b);
• (d) inserting an extra data bit in the transmission of the binary data word of step (a) in response to the detection of the binary transition of step (b);
• (e) determining an increase in the number of bits in the received binary data word;
• and
• (f) demultiplexing in response to the determination made in step (e) the received data word into synchronous data and asynchronous data such that the asynchronous data is outputted a fixed time period after the beginning of the reception of said received multiplexed binary data word.