KR20020041632A - Duplication junction node for local bus - Google Patents

Abstract

PURPOSE: A duplicated interface node in a local bus is provided to reduce standby delay in a local bus by transmitting a strobe signal only to a node in an operation state. CONSTITUTION: A duplicated interface node in a local bus is composed of a plurality of nodes(0-n) and a bus master(100). Duplication is made every two neighboring nodes. The duplicated nodes(o-n) are connected in parallel so as to be interfaced with a communication network of a single local bus type. Each pair of duplicated nodes(0-n), receiving a strobe signal, outputs a bus seizure signal, if the data to be transmitted exist, and seizes the local bus. The bus master(100), transmitting one strobe signal to every duplicated nodes, stops strobe signal transmission if bus seizure signals are inputted from duplicated nodes(0-n).

Description

Redundant match node of local bus {DUPLICATION JUNCTION NODE FOR LOCAL BUS}

The present invention relates to a redundant matching node of a local bus, and more particularly, to a redundant matching node of a local bus to reduce latency in the local bus.

In general, a local area network has a plurality of matching nodes connected in parallel through a local bus and provides the same strobe signal regardless of the operation state or standby state of the matching node managed by the bus master, or the use of the matching node. The ratio of the strobe signal is adjusted according to the number of times, which will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing the local bus occupancy of a node according to a strobe signal of a general bus master. As shown in FIG. 1, redundancy is performed to two adjacent nodes (0 to n), and a single local bus is connected to a communication network. A plurality of nodes (0 to n) connected in parallel so as to be matched with each other, and receiving a strobe signal and outputting a bus occupancy signal if there is data to be transmitted; It is composed of a bus master (100) which transmits the stroke signal to the plurality of nodes (0 ~ n) in sequence, and stops the transmission of the stroke signal to the next node (0 ~ n) when the bus occupancy signal is input. Describe the operation of the device.

First, the bus master 100 sequentially generates strobe signals to a plurality of nodes 0 to n in a round robin manner, that is, if there is no data to be transmitted to the nodes 0 to n receiving the strobe signal, the bus master 100 sequentially. The strobe signal is transmitted to a plurality of nodes 0 to n.

If any one of the nodes 0 to n receives the strobe signal from the bus master 100 and transmits the data, the bus occupancy signal is transmitted to the bus master 100 and occupies a local bus.

Then, when the bus occupancy signal is input, the bus master 100 stops transmitting the strobe signal for the next node (0 to n).

That is, as shown in FIG. 2, the bus master 100 shares all the nodes 0 to n that share the local bus regardless of the operation state / standby state of the nodes 0 to n. By acknowledging ˜n), a bus strobe signal is generated to provide a bus occupancy opportunity similarly.

However, the conventional apparatus operating as described above provides a strobe signal to a node in a standby state in which data transmission does not occur without checking the operation state / standby state of the node, whereby the node in the operation state in which the data transmission occurs relatively occurs. Since the opportunity to occupy the bus is delayed, there is a problem in that the latency of data is long.

Accordingly, an object of the present invention is to provide a redundant matching node of a local bus to reduce a waiting delay in a local bus by transmitting a strobe signal only to a node in an operating state.

1 is a block diagram showing the configuration of a redundant matching node of a typical local bus.

FIG. 2 is a diagram showing local bus occupancy of a node according to the strobe signal in FIG. 1; FIG.

Figure 3 is a block diagram showing the configuration of a redundant matching node of the local bus of the present invention.

FIG. 4 is a diagram showing local bus occupancy of the node according to the strobe signal in FIG.

FIG. 5 is a diagram showing the operation of the redundant node by one strobe signal input in FIG.

***** Description of the symbols for the main parts of the drawings *****

1,2: Buffer 10: Status check and buffer control unit

100: bus master

In order to achieve the above object, the present invention achieves redundancy with two adjacent nodes, is connected in parallel to match a communication network in the form of a single local bus, and receives a strobe signal in units of two nodes each of which is redundant. A plurality of nodes occupying the local bus by outputting a bus occupancy signal if there is data to be transmitted; One stroke signal is transmitted to each of the two redundant nodes, and when the bus occupancy signal is input from the redundant node, the bus master stops transmitting the stroke signal.

Hereinafter, with reference to the accompanying drawings, the operation and effects of the redundant matching node of the local bus according to the present invention will be described in detail.

3 is a block diagram showing the configuration of a redundant matching node of a local bus of the present invention. As shown in FIG. 3, redundancy is performed with two adjacent nodes (0 to n) to be matched with a communication network in the form of a single local bus. A plurality of nodes (0 to n) connected in parallel and receiving a strobe signal in units of two nodes (0 to n) that are duplicated and outputting a bus occupancy signal if there is data to be transmitted; The bus master 100 transmits one stroke signal for each of the two redundant nodes 0 to n, and stops transmitting the stroke signal when a bus occupancy signal is input from the redundant nodes 0 to n. This operation of the present invention will be described.

First, a plurality of nodes 0 to n are redundant with two adjacent nodes 0 to n. That is, if one node 0 to n is in an operating state as shown in FIG. ~ n) becomes the standby state.

At this time, the bus master 100 sequentially applies stroke signals for each of the redundant nodes 0 to n. As shown in (c) of FIG. 4, the bus master 100 connects the redundant nodes 0 to n to one node (0 to n). ), N / 2 stroke signals are generated.

If any one of the redundant nodes 0 to n receives the strobe signal from the bus master 100 and has data to transmit, as shown in FIG. 0 ~ n) are transmitted in units and occupy the local bus.

Then, when the bus occupancy signal is input, the bus master 100 stops transmitting the strobe signal for the next redundant nodes 0 to n.

5 shows a state in which two nodes (0 to n) of the redundancy operate with one strobe signal, and each node (0 to n) is in an operating state or standby state when power is applied. The acknowledgment is transmitted to the state check and the buffer control unit 10.

Then, according to the states of the two redundant nodes 0 to n, the state check and buffer control unit 10 operates the buffers 1 and 2 respectively connected to the two nodes 0 to n. Outputs the first and second buffer enable signals BEN1 and BEN2 for controlling the first and second buffer enable signals, thereby enabling the buffers 1 and 2 connected to the nodes 0 to n which are in operation. The stroke signal is applied through the buffers (1) and (2).

In this case, the first and second buffer enable signals BEN1 and BEN2 are signals whose active periods are opposite to each other.

As described in detail above, the present invention only generates n / 2 bus strobe signals assuming a redundant node composed of an operating state / standby state as one node, and thus, the strobe signal reception rate of the node in the operating state is doubled. The latency of data is reduced, so that data can be transmitted quickly.

Claims (3)

Redundancy is made with two adjacent nodes and connected in parallel to match a communication network of a single local bus type. If there is data to be transmitted by receiving a strobe signal in units of two redundant nodes, it outputs a bus occupancy signal and A plurality of nodes occupying a bus; One stroke signal is transmitted to each of the two redundant nodes, and when the bus occupancy signal is input from the redundant node, the bus master 100 stops the transmission of the stroke signal. . 2. The apparatus of claim 1, further comprising: a state check and buffer control unit which checks the states of two nodes which are redundant and outputs first and second buffer enable signals accordingly; And a first buffer and a second buffer configured to be enabled by the first and second buffer enable signals of the state check and buffer controller, respectively, to buffer the strobe signal output from the bus master 100. Redundant match node of the bus. The redundancy matching node of claim 2, wherein the first and second buffer enable signals have opposite active periods.