JPH05199233A - Device and method for data communication - Google Patents

Abstract

PURPOSE:To flexibly deal with plural communication systems with the same circuit configuration by setting the bit allocation of plural serial data in one frame of time-division multiplexed serial data according to data stored in a storage part. CONSTITUTION:A storage part 101 stores the frame length of one frame in the time-division multiplexed serial data, the number of bits and the bit allocation in one frame of the respectively time-division multiplexed serial data of independent serial data. When assembling the frames of the time-division multiplexed serial data, output signals 112,114,116 and 118 of communication equipments 2-5 are respectively inputted through transmission/reception parts 104-107 to a frame assembly part 102. Based on an output signal 109 of the storage part 101, the assembly part 102 demultiplexes these data and assembles them into time-division multiplexed serial data. The assembled frame becomes an input signal 121 from a transmission part 108 to a communication equipment 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data communication device and a data communication method, and more particularly to a device for processing a plurality of serial data while synchronizing frames and serial data obtained by time-division multiplexing these serial data. The present invention relates to a data communication system that transmits / receives data to / from a processing device. An example of this data communication system is an integrated services digital network (ISDN).
There is data communication between a device performing processing of a physical layer of a user / network interface in an al network) and a device performing processing of a layer higher than the physical layer.

[0002]

2. Description of the Related Art Regarding data communication between a device for processing a physical layer of an ISDN user / network interface and a device for processing a layer higher than the physical layer, the International Telegraph and Telephone Consultative Committee (CCITT) is currently under discussion.
Since it is not standardized by for International TelegraphTelephone), each manufacturer defines its own communication method and develops the processing device individually. A typical example of this is the GCI (General C
ircuit Interface) and IDL (Inter-chip Digial Link) proposed by Northern Telecom. Each frame format is [GCI Specification Issue
1.0, March 1989 pp3-1 to pp3-3] and [The Interchi
p Digital Link (IDL) Specification For ISDN Issue
1.0, July 26, 1985 pp11 to pp14].

FIG. 4 is a timing chart showing an example of GCI operation, and FIG. 5 is a timing chart showing an example of IDL operation. As is clear from comparing FIGS. 4 and 5, GCI and IDL have different frame lengths and bit allocations within one frame.
In order to support the communication methods with the same data communication device, it is necessary to input a signal indicating the communication method from the outside and switch the operation by this signal.

[0004]

By the way, GCI and IDL are available as data communication systems between a device for processing a physical layer of an ISDN user / network interface and a device for processing a layer higher than the physical layer. There are other different communication schemes. Data communication devices that support all these communication methods are expected to have an enormous circuit scale,
Unrealistic.

CCITT also includes ISDN user
Since there is no standardization regarding data communication between a device that performs processing of the physical layer of the network interface and a device that performs processing of a layer higher than the physical layer, unification of communication methods cannot be expected for the time being. There is a possibility that another manufacturer will propose a new communication method in the future, and it is impossible for the existing data communication method to correspond to the new communication method. Therefore, there is a problem that the data communication device must be redesigned in order to support the new communication method.

An example of setting the physical layer processing specifications for each processor is, for example, Japanese Patent Laid-Open No. 61-208937.
Although there is a technique described in No. 1, no countermeasure is specifically shown for a data communication system between a device that performs processing of the physical layer and a device that performs processing of a layer higher than the physical layer.

The purpose of the present invention is for various ISDN users and
A device for processing a plurality of serial data and a device for processing serial data obtained by time-division multiplexing these serial data, such as a device for processing a physical layer of a network interface and a device for processing a layer higher than the physical layer. To provide a data communication device capable of flexibly supporting a plurality of communication systems, including a system that may be proposed in the future, with the same circuit configuration in a data communication system that transmits and receives data to and from ..

[0008]

According to the present invention, the frame length and bit allocation of one frame of time-division multiplexed serial data can be externally programmed,
When a storage unit for storing the frame length and bit allocation in one frame of time-division-multiplexed serial data is provided and it is necessary to change the channel allocation to the input / output ports of a plurality of serial data, A storage unit is provided for storing to which channel of the input / output port the plurality of serial data obtained by decomposing one frame of the divided and multiplexed serial data is allocated.

That is, in order to achieve the above object, the present invention provides an apparatus for processing a plurality of serial data while maintaining frame synchronization and an apparatus for processing a serial data obtained by time-division multiplexing the plurality of serial data. In a data communication device for transmitting and receiving data between two units, a storage unit that variably stores a frame length and bit allocation in one frame of time-division multiplexed serial data and a unit of time-division multiplexed serial data. The present invention proposes a data communication device comprising means for setting bit allocation of a plurality of serial data in a frame according to the data stored in the storage section.

Specifically, a storage unit that variably stores the length and bit allocation of the frame in one frame of time-division-multiplexed serial data, and a frame assembly unit that multiplexes the frames according to the data of this storage unit. , A frame decomposing unit that demultiplexes a frame according to data in a storage unit, a transmitting / receiving unit that receives and transmits a plurality of serial data, and a transmitting / receiving unit that receives and transmits serial data in which a plurality of serial data are time-division multiplexed And a data communication device including a unit.

In order to achieve the above object, the present invention also provides an apparatus for processing a plurality of serial data while maintaining frame synchronization, and an apparatus for processing serial data obtained by time division multiplexing the plurality of serial data. In a data communication device that transmits and receives data between two channels, a plurality of serial data obtained by decomposing one frame of time-division multiplexed serial data is assigned to which channel of a serial port that transmits and receives serial data. A data communication device including a storage unit that variably stores and a unit that sets a channel allocation of a plurality of serial data in one frame of time-division-multiplexed serial data according to the data set in the storage unit Is.

More specifically, a storage unit that stores the channel assignment of a plurality of serial data in one frame of time-division-multiplexed serial data, and a frame assembly unit that multiplexes the frames according to the data of this storage unit. A frame decomposing unit that demultiplexes the frame according to the data in the storage unit, a transmitting / receiving unit that receives and transmits a plurality of serial data, and a transmitting / receiving unit that receives and transmits serial data in which a plurality of serial data are time division multiplexed And a data communication device.

When applied to a semiconductor integrated circuit including a device for processing a physical layer of a user / network interface in an ISDN and a device for processing a layer higher than the physical layer, the device and the physical device for processing the physical layer are used. It is also possible to incorporate any one of the above-described data communication devices into a single chip together with a device for processing layers higher than the layers. In that case, an apparatus that performs processing of a layer higher than the physical layer is M
An apparatus that is a PU and that performs physical layer processing includes a D channel control unit.

[0014]

In the data communication between the device for processing the physical layer of the ISDN user interface and the device for processing the layer higher than the physical layer, the length and bits of one frame of time-division-multiplexed serial data and bits. Allocation,
Channel assignment of a plurality of serial data in one frame of time-division-multiplexed serial data to input / output ports cannot be changed during data communication. That is, when the communication partner is determined, the data communication method corresponding to the communication partner is uniquely determined.

Therefore, in the present invention, at the time of initial setting of the system, a frame length and bit allocation and / or a plurality of serial data are set by an initial setting program in accordance with a communication method corresponding to a communication partner of the communication system to be used. Channel allocation to the input / output ports is set in the storage unit so that data communication using a desired communication method can be performed.

Therefore, even if only one data communication device is used in terms of hardware, if the length of one frame and the bit allocation and the channel allocation are changed by software, it goes without saying that a plurality of currently proposed data communication methods can be used. A data communication device that can flexibly support a data communication method that may be proposed in the future can be obtained.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the data communication device according to the present invention will be described in detail with reference to the drawings. 1 is a block diagram showing a configuration of an embodiment of a data communication device according to the present invention, and FIG. 2 is a timing chart showing an example of the operation of the data communication device of FIG.

In FIG. 1, four independent serial data are multiplexed to generate one time division multiplexed serial data frame, while conversely, one time division multiplexed serial data frame is generated. It is a figure which shows an example of a structure of the data communication apparatus which demultiplexes and produces | generates four independent serial data.

FIG. 2 is a timing chart of the bit allocation operation of the embodiment shown in FIG. In this case, the frame length of one time-division-multiplexed serial data frame is 32 bits, and among the 32 bits, the transmission / reception data of the communication device 2 is allocated to bits 0 to 7, and bits 8 to 15 are allocated. The transmission / reception data of the communication apparatus 3 is assigned to the above, and the transmission / reception data of the communication apparatus 4 is assigned to the bits 16 to 23.

A storage unit 101 is provided in order to externally program the frame length and bit allocation in one frame of time-division multiplexed serial data. In the storage unit 101, the frame length of one frame of time-division-multiplexed serial data, the number of bits in one frame of time-division-multiplexed serial data of each independent serial data, and the time-division of each independent serial data The bit allocation of one frame of the multiplexed serial data is stored.

When assembling a frame of time-division multiplexed serial data, the output signal 112 of the communication device 2, the output signal 114 of the communication device 3, and the output signal 11 of the communication device 4 are used.
6, the output signal 118 of the communication device 5, the transmission / reception unit 104, the transmission / reception unit 105, the transmission / reception unit 106, the transmission / reception unit 1 respectively.
It is input to the frame assembling unit 102 via 07.
Therefore, the frame assembling unit 102 multiplexes these data based on the output signal 109 of the storage unit 101 and assembles them into time-division multiplexed serial data. The assembled frame becomes an input signal 121 from the transmission / reception unit 108 to the communication device 6.

On the contrary, when the frame of the time-division multiplexed serial data is decomposed, the output signal 1 from the communication device 6
20 is input to the frame decomposing unit 103 from the transmitting / receiving unit 108. The frame decomposing unit 103 demultiplexes these data according to the output signal 109 of the storage unit 101 and decomposes the time-division multiplexed serial data into a plurality of frames. The plurality of decomposed frames are input signal 113 of communication device 2, input signal 115 of communication device 3, input signal 117 of communication device 4, and input signal 11 of communication device 5.
9 is input to the communication device 2, the communication device 3, the communication device 4, and the communication device 5 via the transmission / reception unit 104, the transmission / reception unit 105, the transmission / reception unit 106, and the transmission / reception unit 107, respectively.

A storage unit 101 is provided in order to externally program the channel allocation to the transmission / reception unit for a plurality of serial data. The storage unit 101 stores the channel allocation to the input / output ports for each independent serial data. In this case, similarly to the above, the number of bits in one frame of time-division-multiplexed serial data and the bit allocation in one frame of time-division-multiplexed serial data for each independent serial data are simultaneously stored in the storage unit 101. Let If the data communication method is not expected to be changed thereafter, a ROM fixed to a specific communication method may be adopted as the storage unit 101, or a method of replacing this ROM may be adopted.

In addition to the above operation, the frame assembling unit 102 and the frame disassembling unit 103 disassemble the time-division-multiplexed serial data into channels allocated in one frame and a plurality of time-division-multiplexed serial data. Performs channel assignment of serial data.

According to this embodiment, the storage unit 101 for storing the frame length and bit allocation in one frame of time-division multiplexed serial data, and the plurality of serials in one frame of time-division multiplexed serial data. A frame assembling unit 1 that sets the bit allocation of data in a programmable manner according to the data set in the storage unit 101.
02 and the frame disassembling unit 103, even if only one data communication device 1 in terms of hardware, if one frame length and bit allocation and channel allocation are rewritten and stored in the storage unit 101, It is possible to obtain a data communication device capable of flexibly supporting not only a plurality of proposed data communication systems but also a data communication system that may be proposed in the future.

FIG. 3 shows an ISDN of the data communication device of FIG.
It is a block diagram which shows an example of a structure of the communication system applied to the data communication between the apparatus which processes the physical layer of a user / network interface, and the apparatus which processes the layer higher than a physical layer. In the present embodiment, in the data communication between the device for processing the physical layer of the ISDN user / network interface and the communication device for processing the layer higher than the physical layer, the microprocessor 400 for processing the LAPD protocol is provided. Which incorporates the data communication device according to the present invention, and includes an MPU 401 and a D channel control unit 4.
The part except 02 corresponds to the embodiment of FIG. The system configuration is compatible with the GCI communication system.

The microprocessor 400 includes an MPU 401 for processing a layer higher than the physical layer, a D channel control unit 402 for processing a physical layer, a frame length and bits in one frame of time-division multiplexed serial data. A storage unit 403 that stores the allocation, a frame assembly unit 404, a frame disassembly unit 405, an I / O port 406, an I / O port 407, an I / O port 408, and I.
It comprises an / O port 409 and an I / O port 410.

The microprocessor 400 is connected to the physical layer communication device 500 via the input signal 420 and the output signal 419 of the I / O port 410, and the I / O port 40
6 via the input signal 411 and the output signal 412 of B6
I / O port 40 connected to channel communication device 600
7 through the input signal 413 and the output signal 414 of B7
I / O port 40 connected to channel communication device 700
8 input signals 415 and output signals 416 and I /
Input signal 417 and output signal 418 of O port 409
It is connected to the GCI protocol processing device 800 via.

The clock generation circuit 900 has a frequency 512.
Propagation clock 901 for propagating kHz GCI data
, A synchronization signal 902 indicating GCI frame synchronization with a frequency of 8 kHz, a propagation clock 903 for propagating D channel data with a frequency of 16 kHz, and B1 with a frequency of 64 kHz.
It outputs channel data, B2 channel data, M channel data that is a GCI protocol signal, and a propagation clock 904 that propagates SC channel data.

The communication system of FIG.
In the case of the network side of the network interface, the propagation clock 901 corresponds to the DCL of FIG. 4, the synchronization signal 902 corresponds to the FSC, the input signal 420 of the I / O port 410 corresponds to the DU, and the input signal 420 of the I / O port 410. The output signal 419 corresponds to DD. On the other hand, on the terminal side of the ISDN user / network interface, the propagation clock 901 corresponds to the DCL of FIG. 4, the synchronization signal 902 corresponds to the FSC, and the I / O port 4
10 output signal 419 corresponds to DU and I / O port 4
The ten input signals 420 correspond to DD. The physical layer side interface of the physical layer communication device 500 is CCITT Recommendation I.S. 430 and I.D. It corresponds to the S / T interface defined by 431.

The storage unit 403 stores the frame length of one frame of serial data time-division multiplexed by the MPU 401, the number of bits in each time-division-multiplexed serial data frame, and the independent serial data. For each of the time-division-multiplexed serial data, the bit allocation in one frame is input.

The frame disassembling unit 405 multiplexes the data of the M channel and the SC channel in 2B + D and GCI according to the contents of the storage unit 403, and outputs the I / I.
The input signal 420 of the O port 410 is demultiplexed, and the D channel data is sent to the D channel control unit in the microprocessor 400 via the I / O port 406.
1-channel data to the B1-channel communication device 600,
B2 channel data is transferred to B via I / O port 407.
The two-channel communication device 601 has I / O ports 408, I
Data of the M channel and SC channel in GCI is output to the GCI protocol processing device 800 via the / O port 409.

The frame assembling unit 404 outputs an output signal 411 of the I / O port 406 which is B1 channel data and an output signal 413 of the I / O port 407 which is B2 channel data according to the contents of the storage unit 403. The output signal 415 of the I / O port 408, which is M channel data in GCI, and the output signal 417 of the I / O port 409, which is SC channel data in GCI, are multiplexed to generate a GCI frame, and I / O is generated. Port 41
0 to the physical layer communication device 500.

According to this embodiment, a very versatile communication processor semiconductor integrated circuit can be obtained.

[0035]

According to the present invention, a communication system corresponding to a desired system can be realized by software without changing the hardware configuration, so that a highly versatile communication processor semiconductor integrated circuit can be obtained. Be done.

Also, a plurality of communication methods such as GCI and ID
The circuit scale of the semiconductor integrated circuit can be made much smaller than that of a conventional data communication device that supports various methods such as L with a fixed bit length.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a data communication device according to the present invention.

FIG. 2 is a timing chart showing an example of the operation of the data communication device of FIG.

FIG. 3 is an example of a configuration of a communication system in which the data communication device of FIG. 1 is applied to data communication between a device performing processing of a physical layer of an ISDN user / network interface and a device performing processing of a layer higher than the physical layer. It is a block diagram showing.

FIG. 4 is a timing chart showing an example of GCI operation.

FIG. 5 is a timing chart showing an example of IDL operation.

[Explanation of symbols]

 1 data communication device 2 communication device 3 communication device 4 communication device 5 communication device 6 communication device 101 storage unit 102 frame assembly unit 103 frame disassembly unit 104 transmission / reception unit 105 transmission / reception unit 106 transmission / reception unit 107 transmission / reception unit 108 transmission / reception unit 109 storage unit 101 Output signal 110 Clock signal 111 Frame synchronization signal 112 Output signal of communication device 2 113 Input signal of communication device 114 Output signal of communication device 3 115 Input signal of communication device 116 Output signal of communication device 4 117 Communication device 4 Input signal 118 Output signal of communication device 5 119 Input signal of communication device 5 120 Output signal of communication device 6 121 Input signal of communication device 400 Microprocessor 401 MPU 402 D channel control unit 403 Storage unit 404 Frame assembly unit 405 Frame Disassembly unit 406 I / O port 407 I / O port 408 I / O port 409 I / O port 410 I / O port 411 I / O port 406 input signal 412 I / O port 406 output signal 413 I / O port Input signal 407 414 Output signal of I / O port 407 415 Input signal of I / O port 408 416 Output signal of I / O port 407 417 Input signal of I / O port 409 418 Output signal of I / O port 409 419 Input signal of I / O port 410 420 Output signal of I / O port 410 500 Physical layer communication device 501 S / T interface 600 B1 channel communication device 700 B2 channel communication device 800 GCI protocol processing device 900 Clock generation circuit 901 Propagation clock 902 Sync signal 903 Propagation clock 904 Propagation clock

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Claims (10)

[Claims] 1. A data communication device for transmitting and receiving data between a device for processing a plurality of serial data while maintaining frame synchronization and a device for processing serial data obtained by time division multiplexing the plurality of serial data. And a storage unit for variably storing a frame length and bit allocation in one frame of time-division-multiplexed serial data, and a bit allocation of a plurality of serial data in one frame of time-division-multiplexed serial data. And a means for setting according to the data stored in the unit. 2. A data communication device for transmitting and receiving data between a device for processing a plurality of serial data while maintaining frame synchronization and a device for processing serial data obtained by time division multiplexing the plurality of serial data. In, a storage unit that variably stores a frame length and bit allocation in one frame of time-division-multiplexed serial data, a frame assembly unit that multiplexes the frame according to the data of the storage unit, and a storage unit of the storage unit. A frame decomposing unit for demultiplexing the frame according to data, a transmitting / receiving unit for receiving and transmitting the plurality of serial data, and a transmitting / receiving unit for receiving and transmitting serial data in which the plurality of serial data are time-division multiplexed. A data communication device comprising: 3. A data communication device for transmitting and receiving data between a device for processing a plurality of serial data while maintaining frame synchronization and a device for processing serial data obtained by time division multiplexing the plurality of serial data. In (1), a storage unit that variably stores which channel of a serial port that transmits and receives the serial data, which is obtained by decomposing one frame of the time-division-multiplexed serial data, and a time-division multiplex. And a unit for setting channel assignment of a plurality of serial data in one frame of the converted serial data according to the data set in the storage unit. 4. A data communication device for transmitting and receiving data between a device for processing a plurality of serial data while maintaining frame synchronization and a device for processing serial data obtained by time division multiplexing the plurality of serial data. , A storage unit that stores channel assignments of a plurality of serial data in one frame of time-division-multiplexed serial data, a frame assembly unit that multiplexes the frames according to the data of the storage unit, and a storage unit that stores data according to the data of the storage unit. A frame decomposing unit for demultiplexing the frame, a transmitting / receiving unit for receiving and transmitting the plurality of serial data, and a transmitting / receiving unit for receiving and transmitting serial data in which the plurality of serial data are time division multiplexed. A data communication device characterized by being provided. 5. Integrated service digital network (ISDN)
In a semiconductor integrated circuit including a device for processing a physical layer of a user / network interface and a device for processing a layer higher than the physical layer, a device for processing the physical layer and a process for a layer higher than the physical layer are performed. A semiconductor integrated circuit comprising the data communication device according to claim 1 incorporated therein together with the device. 6. The semiconductor integrated circuit according to claim 5, wherein the device that performs processing on a layer higher than the physical layer is an MPU, and the device that performs processing on the physical layer includes a D channel control unit. Semiconductor integrated circuit. 7. A data communication method for transmitting and receiving data between a plurality of serial data and serial data obtained by time-division multiplexing the plurality of serial data while maintaining frame synchronization, wherein a time-division multiplexed serial The frame length and bit allocation in one frame of data are variably stored, and the bit allocation of a plurality of serial data in one frame of time-division multiplexed serial data is set according to the stored bit allocation. According to the method, the plurality of serial data and the serial data obtained by time division multiplexing the plurality of serial data are communicated. 8. A data communication method for transmitting and receiving data between a plurality of serial data and serial data obtained by time-division multiplexing the plurality of serial data while maintaining frame synchronization, wherein a time-division multiplexed serial Variably storing a frame length and bit allocation in one frame of data, multiplexing the frame according to the stored bit allocation, demultiplexing the frame according to the stored bit allocation, A data communication method, comprising: receiving and transmitting serial data; and receiving and transmitting serial data obtained by time-division-multiplexing the plurality of serial data. 9. A data communication method for transmitting and receiving data between a plurality of serial data and serial data in which the plurality of serial data are time-division multiplexed while maintaining frame synchronization. Multiple serial data obtained by disassembling one frame of data is variably stored to which channel of the serial port that transmits and receives the serial data, and the serial data in one frame of serial data that is time-division multiplexed. A data communication method, wherein channel allocation of data is set according to the channel allocation, and the plurality of serial data and serial data obtained by time division multiplexing the plurality of serial data are communicated according to the channel allocation. 10. A data communication method for transmitting and receiving data between a plurality of serial data and serial data in which the plurality of serial data are time-division multiplexed while maintaining frame synchronization, wherein the time-division multiplexed serial is used. Storing channel assignments of a plurality of serial data in one frame of data; multiplexing the frame according to the stored channel assignment; demultiplexing the frame according to the stored channel assignment; A data communication method comprising: receiving and transmitting data, and receiving and transmitting serial data obtained by time-division multiplexing the plurality of serial data.