CN111404791A - Non-blocking reconfigurable SpaceFibre bus crossbar switch and control method - Google Patents
Non-blocking reconfigurable SpaceFibre bus crossbar switch and control method Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/40006—Architecture of a communication node
- H04L12/40013—Details regarding a bus controller
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/40143—Bus networks involving priority mechanisms
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/403—Bus networks with centralised control, e.g. polling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L2012/40208—Bus networks characterized by the use of a particular bus standard
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L2012/40267—Bus for use in transportation systems
- H04L2012/4028—Bus for use in transportation systems the transportation system being an aircraft
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Abstract
A non-blocking reconfigurable SpaceFibre bus crossbar switch and a control method thereof are disclosed, wherein the bus crossbar switch comprises n port reading logic modules, n port switching modules and a multi-port interaction judging module; the n port read logic modules receive the exchange data of the n ports and correspondingly send the exchange data to the n port exchange modules, the n port exchange modules generate read signals and write signals of the ports, and the multi-port interaction judgment module performs connection judgment on output signals generated by the n port exchange modules and then selects and outputs the output signals; all the port reading logic modules and all the port switching modules are the same, and the corresponding module number is instantiated according to the number of n. The control method of the invention has clear data processing flow, can exchange at the highest speed, greatly improves the redesign efficiency, has expandability and transportability and can effectively improve the performance of the switch in optical fiber communication.
Description
Technical Field
The invention belongs to the field of information processing, and relates to a non-blocking reconfigurable SpaceFibre bus crossbar switch and a control method.
Background
With the development of aerospace technology, the amount of information transmitted among devices is increasing day by day, and optical fiber communication is in the process of being carried out in order to better solve the problem of efficient information transmission in the aerospace environment. The optical fiber communication technology has a series of advantages of low power consumption, light weight, large communication capacity, high transmission rate, strong anti-interference capability and the like, is regarded as an effective means for establishing a high-speed communication link in an aerospace environment, and is highly valued by many countries and regions. The switch used for forwarding signals in the communication network occupies a significant position in the network structure, and the efficient and fast interconnection technology between the switches is a key technology.
The cross-connection design among the SpaceFibre bus data directly influences the speed of the interconnection and exchange among the SpaceFibre bus data among a plurality of channels, and the number of different ports of the switch restricts the adaptability of the design scheme.
Disclosure of Invention
The invention aims to solve the problems that the cross interconnection speed between the SpaceFibre bus data is not high and the cross interconnection speed cannot adapt to different exchange port numbers in the prior art, and provides a non-blocking reconfigurable SpaceFibre bus cross switch and a control method thereof, which can automatically change the exchange delay time, have expandability and portability and quickly improve the redesign efficiency.
In order to achieve the purpose, the invention has the following technical scheme:
a non-blocking reconfigurable SpaceFibre bus crossbar switch comprises n port reading logic modules, n port switching modules and a multi-port interaction judging module; the n port read logic modules receive the exchange data of the n ports and correspondingly send the exchange data to the n port exchange modules, the n port exchange modules generate read signals and write signals of the ports, and the multi-port interaction judgment module performs connection judgment on output signals generated by the n port exchange modules and then selects and outputs the output signals; all the port reading logic modules and all the port switching modules are the same, and the corresponding module number is instantiated according to the number of n.
As a preferred implementation scheme of the non-blocking reconfigurable SpaceFibre bus crossbar switch, the read logic module carries out format discrimination on input data in real time, wherein the format discrimination comprises data characters, address characters, end characters, error characters and filling characters, and the discrimination standard is carried out according to the requirement of the SpaceFibre bus data format to generate corresponding identification output.
As a preferred implementation scheme of the non-blocking reconfigurable SpaceFibre bus crossbar switch, the port switching module judges whether to perform switching according to the received address and an indication enabling signal indicating whether to start switching.
As a preferred implementation scheme of the non-blocking reconfigurable SpaceFibre bus crossbar switch, a single-channel switching module has three states, wherein the first state is a state of continuously reading data but not switching, the second state is a waiting state, and the third state is a switching state; when in the first state, the character is always received, but the address character is not received; when the channel is in the second state, the valid address character is received, but the indication enabling signal of the channel starting exchange is invalid, the priority of the channel is invalid or the port exchange is not polled, and waiting is needed; when in the third state, indicating that a valid address character has been received and the port has the highest priority or polls the port, it is in a state to exchange information.
As a preferred implementation scheme of the non-blocking reconfigurable SpaceFibre bus crossbar switch, the multi-port interaction judging module is connected with each port switching module according to the number of switching channels, and corresponding logic judgment is further adopted according to a single-channel interaction state signal given by each port switching module to give a switching starting indication signal of each port switching module.
The invention also provides a control method of the non-blocking reconfigurable SpaceFibre bus crossbar switch, which comprises the following steps:
firstly, inputting data into a single port, firstly, entering a read logic module, carrying out format discrimination on the input data in real time by the read logic module, and carrying out the discrimination standard according to the format requirement of SpaceFibre bus data to generate corresponding identification output;
step two, inputting the corresponding identification output by the reading logic module and input data together as a single-channel switching module, and judging whether to work by the single-channel switching module according to the received address and an indication enabling signal for judging whether to start switching per se;
determining input port data and output port data, constructing a single-channel module state machine according to the purpose of the single-channel switching module, connecting a read signal of the input port data to a write signal of a corresponding output port, and sequentially realizing data switching; the input port data is single channel input data, corresponding identification given by the read logic module and exchange starting indication enabling signals, and the output port data is channel data read signals, data output signals and data write signals of all output ports and channel interaction state signals;
and step four, correspondingly connecting the single-channel switching module through the multi-port interaction judging module according to the number of the switching channels.
Further, as a preferred scheme of the control method of the non-blocking reconfigurable SpaceFibre bus crossbar switch, the method comprises the following steps:
when the output ports conflict in the fourth step, the multi-port interaction judgment module judges the priority of the corresponding input port, the input port with high priority is exchanged first, and the input port with low priority is exchanged later; and when the output ports conflict and the input ports have the same priority, performing polling exchange, and performing the polling exchange sequentially from small to large according to the size of the input ports.
Compared with the prior art, the invention has the following beneficial effects: firstly, the switching delay time can be automatically changed according to the path address switching, the logic address switching or the group adaptive address switching; secondly, the invention can realize rapid expansion under the condition of hardly changing module codes, for example, the number of exchange ports is required to be increased or reduced in the current 8 SpaceFibre bus port exchange, and only the number of instantiated read logic modules and single-channel exchange modules is required to be directly increased or reduced to carry out adaptive modification on the integrally connected multi-port interaction judgment module, thereby greatly improving the redesign efficiency and having expandability and portability. The invention has clear data processing flow, can realize the fastest exchange and improve the performance of the exchanger in optical fiber communication.
Drawings
FIG. 1 is a block diagram of a modular connection of a bus crossbar switch of the present invention;
FIG. 2 is a schematic diagram of information interaction of the single channel module state machine of the present invention;
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Referring to fig. 1, the non-blocking reconfigurable spacefiber bus crossbar switch of the invention comprises 1-11 port read logic modules, 2-12 port read logic modules, 1-12 … … n port read logic modules, 1-1n port switch modules, 1-21 port switch modules, 2-12 port switch modules, 1-12 … … n port switch modules, 1-1n port switch modules and multi-port interaction judgment modules, wherein the 1-11 port read logic modules and the 2-port read logic modules are correspondingly connected with the port read logic modules, and the multi-port interaction judgment modules are simultaneously connected with all the port switch modules 1-3. The port read logic module receives the switching data _ in1, data _ in2 to data _ inn of n ports, generates read signals Rd _1, Rd _2 to Rd _ n of each port, generates write signals Wr _1, Wr _2 to Wr _ n of each port, and switches and outputs the data signals data _ out1, data _ out2 to data _ outn of each port. All port reading logic modules in the bus cross switch are the same, all port switching modules are the same, the cross switch only needs to instantiate the corresponding module quantity according to the quantity of n during control design, and the design of the port reading logic modules and the port switching modules does not need to be changed. The only thing that needs to be changed is the multi-port interaction judgment module, and the multi-port interaction judgment module in the switch only needs to carry out connection judgment on all single-port output signals and then select to output.
Referring to fig. 2, the single-channel module state machine of the present invention includes an idle state, an Rd _ path _ vc _ num state, an Rd _ logic _ addr state, an Rd _ logic _ vc _ num state, an Rd _ path _ wait state, an Rd _ addr _ wait state, an ad _ addr _ tx state, a connect1 state, a connect2 state, an error _ state, an override _ state, a get _ eop/eep state, and a router _ over state; wherein 2_1 reset is valid, 2_2 received logical address, 2_3 lookup destination address, 2_4 logical address invalid, 2_5 destination address vc number match and destination address busy, 2_6 destination address vc number mismatch, 2_7 received path address, 2_8 path address vc number match and destination address conflict, 2_9 path address vc number match and destination address do not conflict, 2_10 path address vc number mismatch, 2_11 and 2_16 received unexpected character, 2_12 logical address corresponds vc number match and header delete valid, 2_13 header delete invalid, 2_14 and 2_22 and 2_23 unconditional, 2_15 and 2_18 connection timeout, 2_17 and 2_19 received eop or eep character, 2_20 priority enable or poll enable, 2_21 wait timeout, 2_24 destination address vc number mismatch. As can be seen from fig. 2, the single-channel switching module operates in the state machine of fig. 2, and constructs 13 states shown in fig. 2 according to the information format to be interacted with the spacefiber bus and the detailed requirements of protocol exchange, and for a single port, there are three states, one is no interactive information, and the port state machine is always in an idle state and waits for effective interactive information; if the interaction information exists and the priority is valid or the polling is valid, the port state machine enters a connect1 or a connect2 state until the interaction is completed; and the third is a waiting state, namely, an Rd _ path _ wait state or an Rd _ addr _ wait state, which indicates that the port has interactive information to exchange but the priority of the port is insufficient or not polled, so as to avoid the situation that the state machine is always dead due to unexpected situations of the device, and particularly, the state machine has a timeout count, and when the duration of the state reaches a specified time, the state machine automatically exits and enters an idle state.
The embodiment of the non-blocking reconfigurable SpaceFibre bus crossbar switch control method comprises the following steps of:
the method comprises the steps that data input by a single port firstly enter a reading logic module, the reading logic module carries out format judgment on the input data in real time, the format judgment comprises data characters, address characters, end characters, error characters and filling characters, and the judgment standard is carried out according to the requirement of a SpaceFibre bus data format. Specifically, the highest bit of the data character is 0, and the lower 8 bits are arbitrary; the highest bit of the address character is 0, and the lower 8 bits have a range limitation; the highest bit of the error character is 1, and the lower 8 bits are 11111110; the most significant bit of the pad character is 1 and the lower 8 bits are 11111011. And generating corresponding identification output through a reading logic module according to the format and the sequence requirement.
And taking the corresponding identification output by the read logic module together with the input data as the input of the single-channel switching module. And the single-channel switching module judges whether the switching work is carried out or not according to the received address and an indication enabling signal for judging whether the switching is started or not. The single-channel switching module has three states, wherein the first state is a continuous data reading state but is not switched, the second state is a waiting state, and the third state is a switching state. The first state indicates that the character has been received, but the address character has not been received; the second state indicates that a valid address character has been received, but the channel initiated switch indication enable signal is invalid, indicating that the channel priority is invalid or not polled to the port switch, and waiting is required; the third state indicates that a valid address character has been received and the port is highest priority or polled to be in a state to exchange information.
The specific work flow of the single-channel switching module is as follows:
the input interface of the single-channel switching module is definite, the input interface is single-channel input data, corresponding identification given by the reading logic module and a switching starting indication enabling signal, and the output interface is a channel data reading signal, data output signals and data writing signals of all output ports and a channel interaction state signal. After input and output signals are determined, a single-channel module state machine is constructed according to the purpose of a single-channel switching module, the single-channel switching module always works under the state machine, the state machine is in an idle state under the standby condition considering reliability design factors, otherwise, polling is carried out under other states, in order to avoid the situation that the state machine cannot return to the idle state due to unexpected errors, a waiting overtime mechanism is respectively arranged under the states of Rd _ path _ wait, Rd _ logic _ wait, connect1 and connect2, if the time under the states reaches overtime, the state is automatically exited, and finally the state returns to the idle state, so that the normal operation of the state machine is ensured. It should be noted that the states of connect1 and connect2 respectively represent path address interconnect and logical address interconnect, and the operation of this state is to connect the input port data to the corresponding output port data, connect the read signal of the input port data to the write signal of the corresponding output port, and sequentially implement data exchange.
The multi-channel interaction judgment module is constructed on the basis of the single-channel exchange module, the main work of the multi-channel interaction judgment module is to connect the single-channel exchange module according to the number of exchange channels, for example, 8 exchange channel interfaces are provided, then 8 single-channel exchange modules are connected, 16 exchange channel interfaces are provided, and then 16 single-channel exchange modules are connected. The multi-channel interactive judging module also adopts corresponding logic judgment according to the single-channel interactive state signal given by the single-channel switching module and gives a switching starting indication signal of each single-channel switching module. If the port 1 is switched to the port 2, and the port 3 is switched to the port 4, and no output port conflict condition exists, the port 1 and the port 3 are switched to the port 2 and the port 4 at the same time. If the port 1 is switched for the port 2, the port 3 is switched for the port 2, and the port 2 conflicts, the switching from the port 1 to the port 2 is completed first, and then the switching from the port 3 to the port 2 is completed according to the mode of adding polling to the priority. The priority is to determine the priority of the corresponding input port when the output ports collide, and the input port with high priority is switched first, and the input port with low priority is switched later. The polling mode is that when the output ports conflict and the input ports have the same priority, the switching is performed by polling from small to large according to the size of the input ports.
Through actual simulation and test verification in a SpaceFibre bus exchanger circuit, the non-blocking reconfigurable SpaceFibre bus crossbar switch and the control method provided by the invention have the advantages of simple design method, clear thought, variable exchange delay according to address types, capability of performing data exchange with the fastest exchange delay time, and extensible portability.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and it should be understood by those skilled in the art that the technical solution can be modified and replaced by a plurality of simple modifications and replacements without departing from the spirit and principle of the present invention, and the modifications and replacements also fall within the protection scope defined by the claims of the present invention.
Claims (7)
1. The utility model provides a non-blocking reconfigurable SpaceFibre bus crossbar switch which characterized in that: the system comprises n port reading logic modules, n port switching modules and a multi-port interaction judging module; the n port read logic modules receive the exchange data of the n ports and correspondingly send the exchange data to the n port exchange modules, the n port exchange modules generate read signals and write signals of the ports, and the multi-port interaction judgment module performs connection judgment on output signals generated by the n port exchange modules and then selects and outputs the output signals; all the port reading logic modules and all the port switching modules are the same, and the corresponding module number is instantiated according to the number of n.
2. The non-blocking reconfigurable SpaceFibre bus crossbar switch of claim 1 wherein: the read logic module carries out format discrimination on input data in real time, wherein the input data comprises data characters, address characters, end characters, error characters and filling characters, the discrimination standard is carried out according to the SpaceFibre bus data format requirement, and corresponding identification output is generated.
3. The non-blocking reconfigurable SpaceFibre bus crossbar switch of claim 1 wherein: and the port switching module judges whether to carry out switching according to the received address and an indication enabling signal for judging whether to start switching per se.
4. The non-blocking reconfigurable SpaceFibre bus crossbar switch of claim 3 wherein: the single-channel switching module has three states, wherein the first state is a state of continuously reading data but not switching, the second state is a waiting state, and the third state is a switching state; when in the first state, the character is always received, but the address character is not received; when the channel is in the second state, the valid address character is received, but the indication enabling signal of the channel starting exchange is invalid, the priority of the channel is invalid or the port exchange is not polled, and waiting is needed; when in the third state, indicating that a valid address character has been received and the port has the highest priority or polls the port, it is in a state to exchange information.
5. The non-blocking reconfigurable SpaceFibre bus crossbar switch of claim 1 wherein: the multi-port interaction judging module is connected with each port switching module according to the number of the switching channels, and corresponding logic judgment is adopted according to single-channel interaction state signals given by each port switching module to give switching starting indication signals of each port switching module.
6. A control method for a non-blocking reconfigurable SpaceFibre bus crossbar switch is characterized by comprising the following steps:
firstly, inputting data into a single port, firstly, entering a read logic module, carrying out format discrimination on the input data in real time by the read logic module, and carrying out the discrimination standard according to the format requirement of SpaceFibre bus data to generate corresponding identification output;
step two, inputting the corresponding identification output by the reading logic module and input data together as a single-channel switching module, and judging whether to work by the single-channel switching module according to the received address and an indication enabling signal for judging whether to start switching per se;
determining input port data and output port data, constructing a single-channel module state machine according to the purpose of the single-channel switching module, connecting a read signal of the input port data to a write signal of a corresponding output port, and sequentially realizing data switching; the input port data is single channel input data, corresponding identification given by the read logic module and exchange starting indication enabling signals, and the output port data is channel data read signals, data output signals and data write signals of all output ports and channel interaction state signals;
and step four, correspondingly connecting the single-channel switching module through the multi-port interaction judging module according to the number of the switching channels.
7. The control method of the non-blocking reconfigurable SpaceFibre bus crossbar switch of claim 6 is characterized in that:
when the output ports conflict in the fourth step, the multi-port interaction judgment module judges the priority of the corresponding input port, the input port with high priority is exchanged first, and the input port with low priority is exchanged later; and when the output ports conflict and the input ports have the same priority, performing polling exchange, and performing the polling exchange sequentially from small to large according to the size of the input ports.
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