CN100428724C - Dynamic time-division exchanger and exchanging method - Google Patents
Dynamic time-division exchanger and exchanging method Download PDFInfo
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- CN100428724C CN100428724C CNB2005100828802A CN200510082880A CN100428724C CN 100428724 C CN100428724 C CN 100428724C CN B2005100828802 A CNB2005100828802 A CN B2005100828802A CN 200510082880 A CN200510082880 A CN 200510082880A CN 100428724 C CN100428724 C CN 100428724C
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Abstract
The apparatus comprises: more than one input and output port module, connected with bus, for use in writing the cell inputted from outside into the bus or reading the cell from the bus and outputting it; and a switch control module, connected to each input and output port module, for use in enquiring whether or not there is cell inputted, recording the routing information from the input and output module, and according to corresponding relation between the source port routing information and the destination port information getting the exchange message of each inputted cell and buffering them, and then according to the buffered exchange message sequentially controlling the exchange of each cell on the bus.
Description
Technical field
The present invention relates to Data Interchange Technology, specially refer to the device and method of realizing dynamic time-division switching in the bus-type switching system.
Background technology
In the bus-type switching system of the shared bus of a plurality of ports, how solving the conflict that each port takies bus is one of key issue that needs to be resolved hurrily.At present, adopt the method for each port time division multiplexing bus to solve above-mentioned bus collision problem usually.
In the method for traditional time division multiplexing bus, by bus resource being divided into more than one time slot, and for each port assignment fixedly the mode of time slot come transmit cell.Like this, each port just can send the cell of self buffer memory in institute's distributed time slot, thereby effectively avoids bus collision.But, in said method, each port with distribute the corresponding relation of time slot to determine, each port only can take bus and send cell in distributing to the time slot of self, so, if certain port does not have cell to send in institute's distributed time slot in the time, at this moment, even the cell that other ports on the bus remain to be exchanged can not be in this Time Slot Occupancy bus, thereby cause bus idle in this time slot, finally cause the utilance of bus to reduce.
Summary of the invention
In order to solve the problem that above-mentioned time division multiplexing bus method exists, the invention provides a kind of device of dynamic time-division switching, each time slot of bus dynamically and liberally can be distributed to the port that need carry out cell switching, the problem of bus collision can be solved, the utilance of bus can be improved again.
The present invention also provides a kind of method of dynamic time-division switching, can realize the dynamic assignment of time interval resource on each port on the bus, when having solved bus collision, has improved the utilance of bus.
The device of the dynamic time-division switching of realization bus-type switching system of the present invention comprises:
The input and output port module that is connected by bus more than one is used for reading cell and output with the cell write bus of external world's input and/or from bus; And
Be connected to the switching control module of each input and output port module, be used to inquire about each input and output port module whether the cell input is arranged, obtain the source port routing iinformation of the cell that input and output port module is imported of cell input, according to the source port routing iinformation of self preserving and the corresponding relation of destination interface information, obtain importing the exchange message and the buffer memory of cell, control each input cell successively according to the exchange message of buffer memory again and on bus, exchange.
Input and output port module of the present invention further comprises:
Input port is used to receive extraneous input cell;
Buffer is extracted in the address, is used for extracting and storing from the cell of described input port input the source port routing iinformation of this cell, according to the read operation signal from switching control module the source port routing iinformation of being stored is outputed to described switching control module;
Input buffer is used to store the cell from input port, according to the read operation signal from switching control module the cell of storing is outputed on the bus;
Output buffer is used for reading and store cell to be sent according to the write operation signal from switching control module from bus; And
Be connected to the output port of described output buffer, be used to export described cell to be sent;
Described switching control module further comprises:
Exchange route control logic module is used to receive the dummy status indication that buffer is extracted in described address, according to each exchange message for the treatment of cell-switching each input and output port module is exchanged route control;
The route translation module, be used to store the corresponding relation of source port routing iinformation and destination interface information, the source port routing iinformation that buffer is extracted in the address is read in control according to exchange route control logic module, and search this cell destination interface information according to the source port routing iinformation that reads, generate this cell switching information and output;
The exchange controller buffer, being used to receive also, cache way outputs to described exchange route control logic module again by certain cell switching information of translation module output;
The exchange timing sequencer is used for the control according to exchange route control logic module, produces a read operation signal and reads the source port routing iinformation that buffer memory in the buffer is extracted in certain input and output port module address;
Exchange read operation module is used for the control according to exchange route control logic module, produces another read operation signal and reads cell in certain input and output port module input buffer; And
Exchange write operation module is used for the control according to exchange route control logic module, produces the output buffer that a write operation signal writes the cell on the bus corresponding purpose input and output port module.
Input buffer of the present invention and output buffer are double-port RAMs.
It is pushup storage that buffer is extracted in address of the present invention.
Exchange controller buffer of the present invention is a pushup storage.
The method of dynamic time-division switching of the present invention, be applied to by an above input and output port module that links to each other by bus and be used for each input and output port module is exchanged the bus-type switching system that the switching control module of control is formed, it is characterized in that described method comprises interface querying and two parallel processes of cell switching;
Described interface querying process comprises:
A, in switching control module, set up the source port routing iinformation of cell that each input and output port module is imported and the corresponding relation of destination interface information;
Whether B, switching control module are inquired about each input and output port module the cell input, record the source port address of the input and output port module of cell input, read the source port routing iinformation of a cell of this input and output port module institute buffer memory, search exchange message and the buffer memory that obtains this cell according to the source port routing iinformation of self setting up and the corresponding relation of destination interface information;
Described cell switching process mainly comprises:
A, in each cell switching cycle, switching control module judges whether self is cached with the exchange message of cell, if having, therefrom read an exchange message, and exchange on bus according to the cell that the exchange message that reads is controlled this exchange message correspondence, otherwise, do not deal with.
Source port routing iinformation of the present invention comprises: the source port address.
Destination interface information of the present invention is that width equals the Bit String that the bus-type switching system comprises the input and output port module number, and each bit in the described Bit String is corresponding one by one with each input and output port module.
Source port of the present invention address is that width equals the Bit String that the bus-type switching system comprises the input and output port module number, and each bit in the described Bit String is corresponding one by one with each input and output port module.
Whether switching control module of the present invention is inquired about each input and output port module has cell to be input as: whether the buffer that described switching control module is used for buffer memory input message source port routing iinformation successively in each input and output port module of cyclic query is empty, if be empty, then there is not the cell input, otherwise, the cell input is arranged.
The corresponding cell of control of the present invention exchanges on bus and comprises following two parallel steps:
A1, according to the source port address in the exchange message, send the input buffer of read operation signal to corresponding input and output port module, control this input buffer cell write bus with buffer memory in the current cell switching cycle;
A2, according to the destination interface information in the exchange message, send the output buffer of write operation signal to corresponding input and output port module, control this output buffer and in the current cell switching cycle, read cell on the bus and output.
This shows,, can obtain following beneficial effect by using dynamic time division switch of the present invention and method:
1, dynamic time division switch of the present invention and method realize the exchange of cell that each input and output port module is imported is controlled by switching control module, making only has an input and output port module to write cell to bus in each cell switching cycle on the bus, thereby can avoid bus collision effectively;
Whether 2, dynamic time division switch of the present invention and method are inquired about each port by the mode of poll the cell input, and be followed successively by the input and output port module distribution bus resource of cell input, the input and output port module that can guarantee the cell input has the chance of equality to take bus, promptly can guarantee the fairness of each input and output port module;
3, the exchange control on bus is separate processes to apparatus and method of the present invention to the poll of each input and output port module state and to cell, wherein, poll to each input and output port module does not take bus resource, thereby can guarantee not have the port of cell input can not take bus, simultaneously, because it is unfixing to distribute to the bus resource of each input and output port module, therefore, can realize the dynamic-configuration of bus resource, improve the utilance of bus greatly.
Description of drawings
Fig. 1 is the structural representation of dynamic time division switch of the present invention;
Fig. 2 is the schematic diagram that has shown route translation module internal structure and target port information format;
Fig. 3 is the schematic diagram that has shown exchange controller buffer institute memory transactions message structure.
Embodiment
For the purpose, technical scheme and the advantage that make invention is clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in further detail.
The invention provides a kind of device of realizing the dynamic time-division switching of bus-type switching system, its structure as shown in Figure 1, mainly comprise: the input and output port module 10 that is connected by bus 31 more than is used for reading cell and output with the cell write bus 31 of external world's input and/or from bus 31; And be connected to the switching control module 20 of each input and output port module 10, be used to inquire about each input and output port module 10 whether the cell input is arranged, obtain the source port routing iinformation of input and output port module 10 cell of importing of cell input, according to the source port routing iinformation of self preserving and the corresponding relation of destination interface information, obtain the exchange message and the buffer memory of each input cell, control each exchange of input and output port module 10 cell of import on bus 31 successively according to exchange message of each input cell of buffer memory again, thereby realize flexible to bus 31 resources, dynamic assignment.Wherein, each input and output port module 10 further comprises: an importation and an output.
Referring to Fig. 1, described importation comprises:
Be used to receive the input port of extraneous input cell;
Described address is extracted buffer 11 and is had the dummy status indication, and switching control module 20 is indicated by the dummy status of extraction buffer 11 in address in each input and output port module 10 and judged whether certain input and output port module 10 has the cell input;
In a preferred embodiment of the invention, described address extraction buffer is pushup storage (FIFO);
In a preferred embodiment of the invention, described input buffer is double-port RAM (DPRAM).
Described output comprises:
In a preferred embodiment of the invention, described output buffer is DPRAM;
Be connected to the output port of described output buffer 13, be used to export described cell.
Switching control module 20 in the dynamic time division switch of the present invention further comprises:
Be connected to described address and extract the exchange route control logic module 26 of buffer 11, be used for each input and output port module 10 of control inquiry whether the cell input is arranged, receive described address and extract the indication of buffer 11 dummy statuss, and each input and output port module 10 is exchanged route control according to each exchange message for the treatment of cell-switching;
Be connected the route translation module 21 between described address extraction buffer 11 and the described exchange route control logic module 26, be used to store the pre-configured source port routing iinformation and the corresponding relation of destination interface information, according to the source port routing iinformation in the control receiver address extraction buffer 11 of exchange route control logic module 26, and search the cell destination interface information of import according to the source port routing iinformation of input, the exchange message that generates this cell is also exported;
Be connected the exchange controller buffer 22 between route translation module 21 and the described exchange route control logic module 26, be used to receive and cache way by certain cell switching information of translation module 21 output, the exchange message with buffer memory outputs to described exchange route control logic module 26 again;
Described exchange controller buffer 22 has dummy status indication and full state indication, when described exchange controller buffer 22 empty indications are effective, the cell that all input and output port module 10 are all not exchanged is described; Completely indicate when effective when described exchange controller buffer 22, illustrate that described exchange controller buffer 22 is full, switching control module 20 will stop to inquire about the cell input whether each input and output port module 10 remains to be exchanged;
In a preferred embodiment of the invention, described exchange controller buffer is FIFO;
Be connected the address extraction buffer 11 of each input and output port module 10 and the exchange timing sequencer 23 between the described exchange route control logic module 26, be used for control, produce the read operation signal and read source port routing iinformation in certain input and output port module 10 addresses extraction buffer 11 according to exchange route control logic module 26;
Be connected the input buffer 12 of each input and output port module 10 and the exchange read operation module 24 between the described exchange route control logic module 26, be used for the control according to exchange route control logic module 26, generation read operation signal reads the cell in certain input and output port module 10 input buffer 12;
And be connected to the output buffer 13 of each input and output port module 10 and the exchange write operation module 25 between the described exchange route control logic module 26, be used for control, produce the output buffer 13 that write operation signal writes the cell on the bus corresponding purpose input and output port module 10 according to exchange route control logic module 26.
To describe the dynamic duty process of above-mentioned dynamic time division switch below by way of example in detail.
In order to control the cell switching that each input and output port module 10 is called for short between the port, device of the present invention need be the different address of each port assignment.Described address can be any self-defining form, in a preferred embodiment of the invention, with the address setting of each port is that length is the Bit String of port number, each bit in the Bit String is represented a port, therefore, can identify this port by certain port corresponding bit in this Bit String is arranged to 1.For example, dynamic time division switch of the present invention comprises numbering and is followed successively by 16 ports of 0 to 15, port address is that length is the Bit String of 16 bits, wherein the bit of each from the low level to a high position represents port 0 to port one 5 successively, for example, the address of port 0 is 0000000000000001, and the address of port one is 0000000000000010, the rest may be inferred, and the address of port one 5 is 1000000000000000.
When certain port has the cell input, the cell that the input buffer 12 of this port reads in and buffer memory is imported, simultaneously, buffer 11 extracts this cell from the cell of input source port routing iinformation is extracted in the address.Described source port routing iinformation can be self-defining form, for example, if dynamic time division switch of the present invention is applied in the asynchronous transfer mode (ATM), described source port routing iinformation is source port number+virtual path number (VPI)+Virtual Channel number (VCI).
In addition, the address is extracted buffer 11 and is had the dummy status indication, and when address extraction buffer 11 was sky, its dummy status was designated as 1, otherwise its dummy status is designated as 0.The address of each port is extracted buffer 11 dummy status of self is indicated the exchange route control logic 26 that directly outputs to switching control module, like this, switching control module 20 just can judge whether this port has cell input according to the dummy status indication that buffer 11 is extracted in the address.
Be example with the switching system that comprises 16 ports still below, describe the concrete course of work of exchange timing sequencer 23 in detail, in this example, exchange timing sequencer 23 will be according to the order poll from the high address to the low order address.
In first clock cycle of clock signal of system, the address 1000000000000000 that exchange timing sequencer 23 produces port one 5 on the one hand, indicate according to the dummy status that buffer 11 is extracted from the address of exchange route control logic module 26 read ports 15 in the address that produces, judge whether the state of the address extraction buffer 11 of port one 5 is empty; Export invalid address signal on the other hand and extract buffer 11, avoid the address of each port to extract buffer 11 output source port routing iinformations to described route translation module 21 to the address of each port; If exchange timing sequencer 23 is judged the dummy status of the address extraction buffer 11 of port one 5 and is designated as 1, promptly this address extraction buffer 11 is empty, then extracts the dummy status indication of buffer 11 with the address of identical method inquiry port one 4 in second clock cycle of clock signal of system.
Be designated as 0 if judge the dummy status of the address extraction buffer 11 of port one 5, be that buffer 11 is extracted not for empty in the address, then in second clock cycle of clock signal of system, address 1000000000000000 according to port one 5 generates corresponding read operation signal to described port one 5, and the route translation module 21 of the source port routing iinformation of its institute's buffer memory of buffer 11 outputs to switching control module 20 extracted in the address of control port 15; Extract the dummy status indication of buffer 11 then with the address of identical method inquiry port one 4 in the 3rd clock cycle of clock signal of system.
So circulation goes down to inquire about all ports, up to having inquired about port 0, then begins the inquiry of next rounds from port one 5 again.
Need to prove; the method of the invention is to the not restriction of search order of each port; both can inquire port 0 from port one 5 according to top example; also can inquire port one 5 from port 0 conversely; or the order that adopts other is inquired about each port; therefore, adopt each port of which kind of sequential query whether to have the cell input can't influence the scope that this invention is intended to protect.
In order to guarantee the fairness of each port, if certain port has a plurality of input cells, in the one query process, also can only extract a source port routing iinformation in the address extraction buffer 11, and then exchange timing sequencer 23 will inquire about next port, and undrawn source port routing iinformation will be waited until when being polled to this port next time and could handle.
The route translation module 21 of switching control module 20 is behind the source port routing iinformation that receives certain port address extraction buffer 11 output, at first write down the source port address of this source port routing iinformation correspondence, then according to the source port routing iinformation of self storing and the corresponding relation of destination interface information, with the source port routing iinformation of input as the address of searching of route translation module 21, for example, with source port number+VPI+VCI is index, find this source port routing iinformation the destination interface information of corresponding cell.
Fig. 2 shown described route translation module 21 internal structures of the preferred embodiment of the present invention and each source port routing iinformation the storage format of corresponding destination interface information.As can be seen from Figure 2, the destination interface information of route translation module 21 each source port routing iinformation that stored, corresponding is a string by 0 or 1 Bit String of forming, the width of this Bit String is the port number of bus-type switching system, and wherein each bit is represented a port.Be example still with the switching system that comprises 16 ports, if in the route translation module 21, the destination interface information of certain source port routing iinformation correspondence is 0000000000000011, then show this source port routing iinformation the destination interface of corresponding cell be port 0 and port one.This shows, by using the destination interface information of this formal definition, can simply realize point-to-point, put the exchange of multiple spot and the broadcasting of cell.But the address of each port is not limited to above-mentioned form, can also adopt other any type of addresses to identify different ports.
Fig. 3 has shown the structure of 22 memory transactions information of the described exchange controller buffer of the preferred embodiment of the present invention.As shown in Figure 3, every exchange message of exchange controller buffer 22 buffer memorys comprises two parts: the source port address and being used to that is used to produce the read operation signal of source port input buffer 12 produces the destination interface information of the write operation signal of destination interface output buffer 13, wherein, destination interface information is at high-order portion, the source port address is at low portion, corresponding each bit, 1 expression is effective, and 0 expression is invalid.Same is example with the switching system that comprises 16 ports, if the exchange message that exchange controller buffer 22 is stored is 00000000000001100000000000000001, shows that then source port is a port 0, and destination interface is port one and port 2.The exchange message that equally, also can adopt other form to preserve each cell.
In addition, exchange controller buffer 22 also has the dummy status indication, when exchange controller buffer 22 is not sky, exchange route control logic 26 will read the exchanging routing information of exchange controller buffer 22 storages successively in each cell switching cycle, then, according to the source port address in the reading exchange message, produce the read operation signal by exchange read operation module 24, the input buffer 12 of control corresponding port outputed to a cell of buffer memory on the bus in the current cell switching cycle; Simultaneously, exchange route control logic 26 is according to the destination interface information in the reading exchange message, produce write operation signal by exchange write operation module 25, output buffer 13 cell on the write bus in the current cell switching cycle of control corresponding port, and then export away, thereby in a cell switching cycle, finish a cell switching.
Below same be the example explanation with the bus-type switching system that comprises 16 ports, if the exchange message that exchange controller buffer 22 is stored is 00000000000001100000000000000001, according to this exchange message, in a cell switching cycle, the read operation signal of port 0 input buffer 12 is effective, and this input buffer 12 outputs to a cell of self buffer memory on the bus; The write operation signal of port one and port 2 output buffers 13 is effective, and these two ports write the cell on the bus output buffer 13 of self.This shows, guarantee to have only input buffer just can not take bus for empty cell by exchange message being cached to exchange controller buffer 22.
The invention also discloses a kind of method of dynamic time-division switching, be applied to exchange the bus-type switching system that the switching control module of control is formed by the above input and output port module that links to each other by bus with to cell that each input and output port module is imported, described method mainly comprises interface querying and two parallel processes of cell switching.
Described interface querying process mainly comprises:
A, in switching control module, set up the source port routing iinformation of cell that each input and output port module is imported and the corresponding relation of destination interface information;
Described source port routing iinformation can be self-defining form, if dynamic time-division switching method of the present invention is applied in the ATM system, then described source port routing iinformation is the form of source port address+VPI+VCI; Described destination interface information also can adopt multiple address format, and in a preferred embodiment of the invention, described destination interface information adopts destination interface information format shown in Figure 2.
Whether B, switching control module are inquired about each input and output port module successively the cell input, if certain input and output port module has the cell input, then write down the source port address of this input and output port module, read the source port routing iinformation of the cell that this input and output port module stores, the destination interface information that the source port routing iinformation of setting up according to self and the corresponding relation of destination interface information are searched this cell is the exchange message and the buffer memory of this cell with the source port address of this cell with corresponding destination interface information combination again.
Wherein, described exchange message can adopt form buffer memory as shown in Figure 3.
Because each input and output port module is when having the cell input, at first with the cell buffer memory of importing, the source port routing iinformation that the while buffer memory extracts from the input cell, so in this step, can be by inquiring about whether the buffer that is used for buffer memory input message source port routing iinformation in each input and output port module is that sky has judged whether the cell input.
Described cell switching process mainly comprises:
A, in each cell switching cycle, switching control module judges whether self is cached with the exchange message of cell, if having, read an exchange message, and exchange on bus according to the cell that the exchange message that reads is controlled this exchange message correspondence, otherwise, do not deal with.
Described control cell exchanges on bus and comprises following two parallel steps:
A1, according to the source port address in the exchange message, send the input buffer of read operation signal to corresponding input and output port module, control this buffer cell write bus with buffer memory in the current cell switching cycle;
A2, according to the destination interface information in the exchange message, send the output buffer of write operation signal to corresponding input and output port module, control this output buffer and in the current cell switching cycle, read cell on the bus and output.
This shows, dynamic time division switch of the present invention and method will be to the status polls of each input and output port module with to the distribution separate processes of bus resource, avoiding bus collision, when guaranteeing that each input and output port module justice takies bus, guarantee not have the input and output port module of cell input can not take bus, realize the dynamic-configuration of bus resource, improve the utilance of bus greatly.
Claims (11)
1, a kind of device of realizing the dynamic time-division switching of bus-type switching system is characterized in that, comprising:
The input and output port module (10) that is connected by bus (31) more than one is used for reading cell and output with the cell write bus (31) of external world's input and/or from bus (31); And
Be connected to the switching control module (20) of each input and output port module (10), be used to inquire about each input and output port module (10) whether the cell input is arranged, obtain the source port routing iinformation of input and output port module (10) cell of importing of cell input, according to the source port routing iinformation of self preserving and the corresponding relation of destination interface information, obtain importing the exchange message and the buffer memory of cell, control each input cell successively according to the exchange message of buffer memory again and go up exchange in bus (31).
2, device as claimed in claim 1 is characterized in that, described input and output port module (10) further comprises:
Input port is used to receive extraneous input cell;
Buffer (11) is extracted in the address, be used for extracting and storing the source port routing iinformation of this cell, the source port routing iinformation of being stored outputed to described switching control module (20) according to read operation signal from switching control module (20) from the cell of described input port input;
Input buffer (12) is used to store the cell from input port, according to the read operation signal from switching control module (20) cell of storing is outputed on the bus (31);
Output buffer (13) is used for reading and store cell to be sent according to the write operation signal from switching control module (20) from bus (31); And
Be connected to the output port of described output buffer (13), be used to export described cell to be sent;
Described switching control module (20) further comprises:
Exchange route control logic module (26) is used to receive the dummy status indication that buffer (11) is extracted in described address, according to each exchange message for the treatment of cell-switching each input and output port module (10) is exchanged route control;
Route translation module (21), be used to store the corresponding relation of source port routing iinformation and destination interface information, read the source port routing iinformation that buffer (11) is extracted in the address according to the control of exchange route control logic module (26), and search this cell destination interface information according to the source port routing iinformation that reads, generate this cell switching information and output;
Exchange controller buffer (22), being used for receiving also, cache way outputs to described exchange route control logic module (26) again by certain cell switching information of translation module (21) output;
Exchange timing sequencer (23) is used for the control according to exchange route control logic module (26), produces a read operation signal and reads the source port routing iinformation that buffer memory in the buffer (11) is extracted in certain input and output port module (10) address;
Exchange read operation module (24) is used for the control according to exchange route control logic module (26), produces another read operation signal and reads cell in certain input and output port module (10) input buffer (12); And
Exchange write operation module (25) is used for the control according to exchange route control logic module (26), produces the output buffer (13) that a write operation signal writes the cell on the bus corresponding purpose input and output port module (10).
3, device as claimed in claim 2 is characterized in that, described input buffer (12) and output buffer (13) are double-port RAMs.
4, device as claimed in claim 2 is characterized in that, it is pushup storage that buffer (11) is extracted in described address.
5, device as claimed in claim 2 is characterized in that, described exchange controller buffer (22) is a pushup storage.
6, a kind of method of dynamic time-division switching, be applied to by an above input and output port module that links to each other by bus and be used for each input and output port module is exchanged the bus-type switching system that the switching control module of control is formed, it is characterized in that described method comprises interface querying and two parallel processes of cell switching;
Described interface querying process comprises:
A, in switching control module, set up the source port routing iinformation of cell that each input and output port module is imported and the corresponding relation of destination interface information;
Whether B, switching control module are inquired about each input and output port module the cell input, record the source port address of the input and output port module of cell input, read the source port routing iinformation of a cell of this input and output port module institute buffer memory, search exchange message and the buffer memory that obtains this cell according to the source port routing iinformation of self setting up and the corresponding relation of destination interface information;
Described cell switching process mainly comprises:
A, in each cell switching cycle, switching control module judges whether self is cached with the exchange message of cell, if having, therefrom read an exchange message, and exchange on bus according to the cell that the exchange message that reads is controlled this exchange message correspondence, otherwise, do not deal with.
7, method as claimed in claim 6 is characterized in that, described source port routing iinformation comprises: source port address, virtual path number and Virtual Channel number.
8, method as claimed in claim 6, it is characterized in that, described destination interface information is that width equals the Bit String that the bus-type switching system comprises the input and output port module number, and each bit in the described Bit String is corresponding one by one with each input and output port module.
9, method as claimed in claim 6, it is characterized in that, described source port address is that width equals the Bit String that the bus-type switching system comprises the input and output port module number, and each bit in the described Bit String is corresponding one by one with each input and output port module.
10, method as claimed in claim 6, it is characterized in that, whether described switching control module is inquired about each input and output port module has cell to be input as: whether the buffer that described switching control module is used for buffer memory input message source port routing iinformation successively in each input and output port module of cyclic query is empty, if be empty, then there is not the cell input, otherwise, the cell input is arranged.
11, method as claimed in claim 6 is characterized in that, the corresponding cell of described control exchanges on bus and comprises following two parallel steps:
A1, according to the source port address in the exchange message, send the input buffer of read operation signal to corresponding input and output port module, control this input buffer cell write bus with buffer memory in the current cell switching cycle;
A2, according to the destination interface information in the exchange message, send the output buffer of write operation signal to corresponding input and output port module, control this output buffer and in the current cell switching cycle, read cell on the bus and output.
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| CN1269936A (en) * | 1997-07-11 | 2000-10-11 | 艾利森电话股份有限公司 | Augmentation of ATM cell with buffering data |
| US6772269B1 (en) * | 1999-11-05 | 2004-08-03 | Nec Corporation | Bus switch and bus switch system for increased data transfer |
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| CN1019730B (en) * | 1989-10-30 | 1992-12-30 | 烟台市农业机械管理局 | A kind of corn harvesting bench of self-propelled combine |
| CN1147328A (en) * | 1994-04-29 | 1997-04-09 | 艾利森电话股份有限公司 | Time switch system |
| CN1132017A (en) * | 1994-08-03 | 1996-09-25 | 摩托罗拉公司 | Advanced communication system architecture |
| US6115374A (en) * | 1995-12-22 | 2000-09-05 | Cisco Technology, Inc. | Method and apparatus for dynamically assigning bandwidth for a time division multiplexing data bus |
| WO1998038760A2 (en) * | 1997-02-13 | 1998-09-03 | Mcdata Corporation | Data communication system utilizing a scalable, non-blocking, high bandwidth central memory controller and method |
| CN1269936A (en) * | 1997-07-11 | 2000-10-11 | 艾利森电话股份有限公司 | Augmentation of ATM cell with buffering data |
| US6772269B1 (en) * | 1999-11-05 | 2004-08-03 | Nec Corporation | Bus switch and bus switch system for increased data transfer |
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| CN1897555A (en) | 2007-01-17 |
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