KR880002509Y1 - Network interface circuit of computer - Google Patents

Abstract

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Description

Network interface circuit of personal computer

1 is a configuration diagram of a ring network using a network interface circuit of the present invention.

2 is a detailed circuit diagram of a network interface circuit of the present invention.

3 is a timing chart of a network state search interface.

4 is a block diagram of a conventional network interface.

* Explanation of symbols for main parts of the drawings

10: Serial interface 20: Network status search interface

30: Personal computer main unit RxD: Receive data input terminal

TxD: Transmission data output terminal

IEI: Search input terminal for data transmission

IEO: Search output terminal for data transmission

IC ₁ : IC I ₁ ~ I ₃ : Inverter

OR: or gate B ₁ , B ₂ : buffer

R ₁ , R ₂ : Resistor C ₁ , C ₂ : Capacitor

D ₁ , D ₂ : Diode

The present invention relates to a network interface circuit of a personal computer for forming a ring network.

The conventional network interface circuit configuration is composed of a bus interbase, a network interface controller, a memory, and the like, as shown in FIG. 4, and information exchange between personal computers is time-sharing or token passing. By passing).

That is, the personal computer main body determines whether or not another subscriber in the network is using a data transmission line, and when it is in a state where it can transmit data, it uses a network interface controller and a bus interface that controls data transmission. Since it was configured to exchange information with other personal computers, it was necessary to use expensive interface control circuits, as well as to require separate software.

The present invention has been made in view of the above-described drawbacks to facilitate data transmission between personal computers that have constituted a network by a hardware check circuit of a simple configuration. The explanation is as follows.

FIG. 2 is a detailed circuit diagram of the network interface constituting the ring network shown in FIG. 1, which determines whether or not data of another computer is already transmitted (Busy state) on a data transmission line in the network. Inverter (I ₁ ), (I ₂ ), (I ₃ ), capacitor (C ₁ ), (C ₂ ), resistor (R ₁ ), (R ₂ ), diode (D ₁ ), (D ₂ ) of the serial interface 10 and the personal computer body 30 by sending and receiving data to and from the network state retrieval interface 20 composed of (D ₂ ), IC (IC ₁ ), and buffers (B ₁ ), (B ₂ ). The input / output port I / O and the data input / output terminal DT ₁ are connected, and the output terminal and the received data input terminal RxD of the serial interface 10 are connected to the transmission data output terminal TxD. It is configured by connecting to both input terminals of the connected OR gate OR.

In addition, in order to form a ring network, the network interface circuits described above are configured by the number corresponding to the number of n personal computers to be joined in the ring network, connected to each of the n personal computers, and connected as described below. A ring network as shown in FIG. 1 is constructed.

That is, the reception data input terminal RxD and the network state search of the n-1 th network interface circuit N _n-1 (connected to the n-1 th personal computer) among the network interface circuits configured as described above. The data transfer possibility search input terminal (IEI) of the interface ₂₀ is a transmission data output terminal (TxD) of the _n-2nd network interface circuit (N _n-2 ) connected to the n-2th personal computer of the preceding stage. And the transmission data output terminal (TxD) and the network of the n-1 th work interface circuit (N _n -1), respectively, connected to the data transmission availability search output terminal (IEO) of the network status search interface 20, respectively. The data transmission availability search output terminal IEO of the status search interface 20 is a reception data input terminal RxD of the _nth network interface circuit N _n connected to the nth personal computer at the rear stage and a network state. Search Whether or not data transfer is possible in the interface 20 is coupled to the search input (IEI), the n-2-th and n-th network interface circuitry (N _n-2), (N _n) receive data input (RxD of ), And the data transmission possibility of the transmission data output terminal (TxD) and the network status search interface 20. The input, output terminals (IEI), and (IEO) are connected to the front and rear computers in the manner described above. Each ring network is connected to each connected network face circuit.

Referring to the effect of the present invention configured as described above are as follows.

Referring to a process in which the n-1th personal computer shown in FIG. 1 transmits data to the nth personal computer, the n-1th computer can transmit data through the butter B ₁ shown in FIG. Whether the data can be transmitted as a signal applied to the search port (DT ₂ ). Check the data transmission possible state of the search output terminal (IEO), and if it is high (ie, non-busy state), the clock is input to the input / output port (I / O). outputting a signal to IC (IC ₁₎ clock terminal (CK) is hameuroseo IC (IC ₁₎ to enable data transfer availability search output (IEO) to create a low state n-1 of the second computer on their signals to the From now on, it will signal the nth computer that it is using the data transmission line (Busy state).

In this case, the n-1 computer receives data from the n-1 computer that can transmit data from the n-1 computer. Terminal of the IC (IC ₁ ) via the inverter (I ₁ ), capacitor (C ₂ ), resistor (R ₂ ), diode (D ₂ ) and inverter (I ₃ ) of the network status search interface 20. Since a pulse is applied to CL), as shown in FIG. 3, the data transmission possibility search output terminal (IEO) is made low, and the signal of the low state (Busy state) is connected to the next stage. Whether or not the search data interface 20 can transmit data The search output terminal IEO is set low.

As such, signals to the nth and subsequent computers are used to transmit the data transmission line so that the data transmission line cannot be used, and then the data of only the n-1th computer is taken from the output terminal of the serial interface 10. The transmission starts to another computer via the gate OR and the transmission data output terminal TxD.

When data is transmitted through the transmission data output terminal TxD in this manner, the nth computer receives the data through the reception data input terminal RxD in the network interface circuit 20 of the present invention, and through the OR gate OR. Transmits the received data to the next computer, and all the computers joined to the network receive the data transmitted from the n-th computer sequentially by the same procedure as described above.

On the other hand, as described above, when data is transmitted, the n-th computer receives its own data through its received data input terminal RxD if its data transmitted through the transmission data output terminal TxD is transmitted in the network. The data is received, and thus the received data can be compared with the transmitted data, so that it is possible to determine whether there is an abnormality in the transmission, as well as to correct an error.

On the other hand, when data is transferred as described above, and then data transfer is completed, the n-th computer outputs a clock signal to the input / output port (I / O) and applies it to the clock signal terminal CK of the IC (IC). Thus, the IC (IC) causes the data transfer possible search output terminal (IEO) signal to be in a high state so that the data transfer capability search input terminal (IEI) of the network state search interface 20 connected to the nth computer is allowed. In this case, the nth computer is informed that the data transmission line is empty (Non Busy state).

In this way, the high-state signal applied through the nth computer's data transmission availability search input terminal (IEI) includes a buffer (B ₂ ), a capacitor (C ₁ ), a resistor (R ₁ ), a diode (D ₁ ), and an inverter. A reset pulse as shown in FIG. 3 is applied to the preset terminal PR of the IC (IC ₁ ) via (I ₂ ) to turn the data transmission possible search output terminal (IEO) high ( Non-busy state, and the same procedure sequentially informs the nth and subsequent computers that the line is empty (Non Busy state) so that other computers can use the data transmission line.

The present invention, which is operated as described above, provides an effect that the manufacturing cost is low by a simple hardware search using a ring network, and the interface software is not only easy to write, but also easy to correct errors.

Claims (1)

Inverter (I ₁ ), (I ₂ ), (I ₃ ), condenser (C), () to determine whether data of another computer is already transmitted to the data transmission line in the network. C), resistance (R ₁ ) (R ₂ ), diode (D ₁ ) (D ₂ ), IC (IC ₂ ) and buffer (B ₁ ) (B ₂ ) to send and receive data to the network status search interface 20 Connecting the input / output port (I / O) and the data input / output terminal (DT) of the serial interface 10 and the personal computer main body 30 for the first time, and the output terminal and the received data input terminal of the serial interface 10 ( RxD) is connected to both input terminals of an OR gate whose output side is a transmission data output terminal (TxD) or a transmission data output terminal (TxD) to form a network interface, and the received data input terminal (RxD) and transmission data output of the network interface. Terminal (TxD) is the transmission data output terminal (TxD) of the front computer. Connect to the receiving data input terminal (RxD) of the back computer, and search for data transmission capability of the network interface. Input and output terminals (IEI) and (IEO) are the data transmission of the front and back computers. Network interface circuit of a personal computer that makes it easy to correct an error and transmit data by forming a ring network by connecting to an input terminal (IEI) and an input terminal (IEI), respectively.