JP3919622B2 - Polling control apparatus and method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a polling control apparatus and method in an asynchronous transfer mode (ATM) data transmission / reception system, and more particularly, to an ATM layer function and a plurality of PHY (multiple PHYs) in an ATM data transmission / reception system defined by the ATM Forum. When connecting to the (physical) layer function Po The present invention relates to an apparatus and method for performing ring control.
[0002]
[Prior art]
Conventionally, as a polling control device that performs polling control in accordance with UTOPIA (Universal Test & Operations Interface for ATM) level 2 defined by the ATM Forum, for example, there is one disclosed in Japanese Patent Laid-Open No. 11-27276. This conventional polling control device is configured to arbitrarily set a PHY number for designating a PHY layer function when polling a plurality of PHY layer functions from an ATM layer function, thereby enabling a data transmission / reception system having such a layer configuration. It is possible to suppress a decrease in communication performance in the Internet. Specifically, by providing the ATM function layer with a PHY number conversion register write function, a PHY number conversion register function, and a polling maximum cycle counter, the PHY number transmission order and number of appearances are not affected even during polling. Can be set and controlled arbitrarily.
[0003]
[Problems to be solved by the invention]
However, the conventional polling control apparatus as described above has to be equipped with a function such as dynamically changing a specific PHY number preferentially, so that the circuit configuration related to the polling control becomes complicated. There is.
[0004]
Therefore, an object of the present invention is to provide a polling control apparatus and method having a relatively simple configuration that can select and poll a plurality of PHY layer devices connected to an ATM layer device evenly.
[0005]
[Means for Solving the Problems]
To solve the above problem, First The present invention Polling controller Is a polling control device in a data communication system in which an ATM layer device transmits / receives cell data to / from a plurality of PHY layer devices in an asynchronous transfer mode, (1) Concerned Polling period Within PHY number of the PHY layer device in trust In addition, Shift by any number from zero to the total number of PHY layer devices Obtained PHY number As the polling start phase that starts operation at the next polling cycle. A polling start phase determining means to determine; and (2) a polling start phase determining means. More determined As the polling start phase of From PHY number , Predetermined number Cyclically Stagger Each of the resulting PHY numbers For PHY layer devices , Polling execution means for performing a polling operation; and (3) polling execution means. By the polling cycle Polling operation Has started , Valid to indicate that cell data is ready for transmission / reception Cell presence / absence response signal The At first received PHY layer equipment , Selecting means for selecting as a PHY layer device to be communicated next; When the PHY layer device that first receives a valid cell presence / absence response signal is communicating cell data, the selection means does not select the PHY layer device that is currently communicating as a PHY layer device that is to communicate next, A PHY layer device other than the currently communicating PHY layer device is sequentially selected. Polling controller.
[0006]
In such a polling control device, the PHY number obtained from the PHY number of the PHY layer device that is communicating in the polling cycle excluding the PHY selection phase is determined as the polling start phase, and the PHY determined as the polling start phase A polling operation is performed on a plurality of PHY layer devices cyclically by shifting a predetermined number from the number. Then, during the polling operation, the PHY layer device in which the cell presence / absence response signal is first valid is selected under the condition that the PHY layer device in communication is not selected even if the corresponding cell presence / absence response signal is valid within the polling cycle. The layer device is selected as the PHY layer device to be communicated next. As a result, in the process of selecting a plurality of PHY layer devices in the polling cycle excluding the PHY selection phase, a PHY layer device with a valid cell presence / absence response signal is cyclically selected in a state where the same PHY layer device is not selected. Become so.
[0007]
Therefore, selection and polling of a plurality of PHY layer devices connected to the ATM layer device can be performed equally.
[0008]
From the viewpoint that efficient PHY layer equipment can be selected, in the polling apparatus according to the present invention, the selection means uses a cell presence / absence response signal other than the PHY layer equipment that is communicating in the polling period excluding the PHY selection phase. When there is no PHY layer device that has become, the PHY layer device in communication can be selected.
[0009]
Further, from the viewpoint that the configuration can be further simplified, in the polling control device according to the present invention, the polling start phase determining means sets the PHY number shifted by zero from the PHY number of the PHY layer device in communication as the polling start phase. Can be configured to.
[0010]
In this case, the PHY number itself of the PHY layer device in communication is determined as the polling start phase.
[0011]
Furthermore, from the viewpoint that the configuration can be simplified, the polling control device according to the present invention is configured such that the polling execution unit performs the polling operation in ascending order from the PHY number determined as the polling start phase. Can do.
[0012]
Similarly, in the polling control apparatus according to the present invention, the polling execution means can be configured to perform the polling operation in descending order from the PHY number determined as the polling start phase.
[0013]
In the polling control apparatus according to the present invention, the predetermined number shifted from the PHY number determined as the polling start phase by the polling execution unit is 1 or more, and the PHY layer device Total It can be configured to be set to a number less than the number.
[0014]
In that case, the polling control device according to the present invention has the above-described PHY layer device in view of being able to surely enable the polling operation for all the PHY layer devices. Total When the number is an even number, the predetermined number can be set to a number that does not become an even number.
[0015]
Further, from the viewpoint that it can be configured with a simpler configuration, in the polling control device according to the present invention, the polling execution unit shifts the predetermined number of times from the PHY number determined as the initial polling phase. Total A counting unit that cyclically performs a counting operation within a number and outputs the count value as a new PHY number, and the selection unit outputs the PHY number from the counting unit under a predetermined condition. It has a register unit that stores a count value as a PHY number that identifies a PHY layer device to communicate next, and controls the count operation of the count unit based on cell presence / absence response signals from a plurality of PHY layer devices, Control means for supplying the selection means with a state signal for giving the predetermined condition to the selection means can be provided.
[0016]
In such a polling control device, selection and polling of a plurality of PHY layer devices connected to the ATM layer device can be performed evenly by using only the counter unit, the register unit, and the control means for controlling them. become.
[0017]
Also, from the viewpoint that the polling control apparatus according to the present invention can be used more effectively, the ATM layer device and the PHY layer device and the asynchronous transfer mode according to the UTOPIA level 2 definition of the 1-cell presence / absence response signal system It can be configured to be applied to a data communication system that transmits and receives cell data.
[0018]
Furthermore, in order to solve the above problems, Second The present invention Polling control method Is a polling control method in a data communication system in which an ATM layer device transmits and receives cell data in a asynchronous transfer mode with a plurality of PHY layer devices, A polling start phase determining means, a polling executing means and a selecting means; (1) the polling start phase determining means Polling period Within PHY number of the PHY layer device in trust In addition, Shift by any number from zero to the total number of PHY layer devices Obtained PHY number As the polling start phase that starts operation at the next polling cycle. A procedure for determining a polling start phase to be determined; (2) Polling execution means For polling start phase determination means More determined As the polling start phase of From PHY number , Predetermined number Cyclically Stagger Each of the resulting PHY numbers For PHY layer devices , A polling execution procedure for performing a polling operation; and (3) The selection means is Polling means By the polling cycle Polling operation Has started , Valid to indicate that cell data is ready for transmission / reception Cell presence / absence response signal The At first received PHY layer equipment , And a selection procedure for selecting as a PHY layer device to be communicated next, When the PHY layer device that first receives a valid cell presence / absence response signal is communicating cell data, the selection procedure by the selection means selects the PHY layer device in communication as the PHY layer device to be communicated next. Without selecting a PHY layer device other than the PHY layer device in communication .
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0020]
The layer configuration of the data transmission / reception system to which the polling control apparatus according to the embodiment of the present invention is applied is as shown in FIG.
[0021]
In FIG. 2, a plurality (m pieces) of PHY layer devices (port numbers) 20 (0), 20 (1),..., 20 (m) are connected to the ATM layer device 10. In a system having such a layer configuration, the ATM layer device 10 transmits and receives data while performing a polling operation on each of the PHY layer devices 20 (0) to 20 (m).
[0022]
The reception (Rx) interface compliant with UTOPIA level 2 including the control function of the polling operation in the ATM layer device 10 as described above is configured as shown in FIG.
[0023]
In FIG. 1, the reception (Rx) interface includes a write control unit 100, a cell buffer 150, and a read control unit 180. The write control unit 100 has a polling and selection function and a cell buffer write control function. The cell buffer 150 includes a first in first out (FIFO) memory for buffering cells. The read control unit 180 reads the received cell data from the cell buffer 150 and outputs it to the reading device (ATM layer device 10) side, and has a collision detection function.
[0024]
Input data (a), which is cell data from the external UTOPIA (PHY layer devices 20 (0) to 20 (m)) side, and a cell presence / absence response signal (c) are supplied to the write control unit 100. The write control unit 100 outputs a PHY address (b) for designating a PHY layer device to the external UTOPIA side by the polling and selection function. A write clock (f) from the external unit is supplied to the write control unit 100 and the cell buffer 150. The write address (d) and write data (e) that are output from the write control unit 100 are sequentially supplied to the cell buffer 150 in synchronization with the write clock (f), and the cell buffer 150 designates the write data (d). The stored write addresses (e) are sequentially stored in synchronization with the write clock (f).
[0025]
A read clock (i) from the external unit is supplied to the read control unit 180 and the cell buffer 150. The read control unit 180 supplies the read address (g) to the cell buffer 150 in synchronization with the read clock (i), and the cell buffer 150 converts the data stored in the read address (g) to read data (h ) In synchronization with the read clock (i). In addition, the read control unit 180 transfers the output data (j) to the reading device (ATM layer device 10) side.
[0026]
The reception interface as described above performs processing in accordance with a control sequence defined in UTOPIA level 2. By the way, UTOPIA level 2 defined by the ATM Forum is a control sequence when one or a plurality of ATM layer functions exchanges cells with one or a plurality of PHY layer functions, particularly a plurality of PHY layers. Provides control over functions.
[0027]
Below, the control sequence based on UTOPIA level 2 is demonstrated easily.
[0028]
According to the regulations on UTOPIA, the ATM layer function has the right to control the transfer of cell data. Actually, the ATM layer function grasps the state of the PHY layer function by performing a polling operation on the PHY layer. And is supposed to take action. At this time, in UTOPIA level 2, a unique PHY number is set for each PHY layer function in order to identify one or a plurality of PHY layer functions. The PHY number of all “1” cannot be used.
[0029]
The ATM layer function selects one PHY layer function from a plurality of PHY layer functions by sending a PHY number to all PHY layer functions. In the PHY layer function selected at this time, in the model in which cell data is transferred from the PHY layer to the ATM layer, status information indicating whether or not cell data to be transferred to the ATM layer function side is ready for transfer is displayed in the ATM layer. It is returned to the function as a received cell presence / absence response signal. In the model in which cell data is transferred from the ATM layer to the PHY layer, the selected PHY layer function indicates whether or not the PHY layer function side is ready to receive cell data for at least one cell. Status information is returned to the ATM layer function as a transmission cell presence / absence response signal. Then, the ATM layer function starts transfer of cell data based on these cell presence / absence response signals.
[0030]
In the above sequence, the transmission order of the PHY numbers to be sent to the PHY layer function side is not defined in UTOPIA level 2.
[0031]
Since the transfer clock on UTOPIA is as high as several tens of MHz, the UTOPIA level 2 stipulation is that a cell presence / absence response signal is returned one clock after the PHY number is sent from the ATM layer side. In order to stabilize the signal on the transmission line, one clock after sending out the PHY number is stipulated to send out all “1” PHY numbers.
[0032]
The polling operation is performed as follows in the receiving interface that operates in accordance with the above UTOPIA Level 2 regulations.
[0033]
The write control unit 100 that receives the cell data (a) and the cell presence / absence response signal (c) performs a polling operation. The cell data selected as the next cell is buffered in the cell buffer 150 and then output to the device side (ATM layer device 10 side) by the read control unit 180.
[0034]
The polling algorithm is shown in FIG. In this example, the number of PHY layer devices 20 (0) to 20 (m) is “5”, and the polling period n is set to “15”. PHY numbers 0 to 4 (PHY addresses) are set for the five PHY layer devices 20 (0) to 20 (4).
[0035]
Polling is done according to the following basic rules.
[0036]
(1) Cell data from the same PHY as the receiving cell is not selected within the polling period n.
[0037]
(2) Polling is started from the same PHY as the PHY during cell reception.
[0038]
(3) Continue polling while incrementing the PHY number by +1.
[0039]
In FIG. 3, while receiving the cell of PHY0, PHY1 has the highest priority, and then polling is performed according to the priority of PHY2, PHY3, and PHY4. Also, since PHY0 during cell reception is not selected within the polling period n, polling is again performed according to the priority order of PHY1, PHY2, PHY3, and PHY4 within the polling period.
[0040]
For example, when all PHYs can be received, when PHY0 is receiving a cell, PHY1 is the next cell, when PHY1 is receiving a cell, PHY2 is the next cell, and PHY2 is receiving a cell PHY3 is selected as the next cell, PHY4 is selected as the next cell when PHY3 is receiving the cell, and PHY0 is selected when PHY4 is receiving the cell.
[0041]
Timing charts are shown in FIGS. In this example, the number of PHY layer devices is “5”, and the polling period n is set to “26”.
[0042]
The PHY address (PHY number) circulates from 0 to m−1 (4) with 1F interposed in synchronization with the write clock according to the round robin method. When the reception of the cell from each PHY is completed, the cell presence / absence response signal becomes valid.
[0043]
The PHY number for which the cell presence / absence response signal is first valid in the polling period n is selected as the next cell. At that time, the polling operation for the next cell is resumed from the selected PHY number (select PHY number).
[0044]
FIG. 4 is a timing chart when the cell presence / absence response signal having the same PHY as that of the cell being received is first activated. In this case, during reception of PHY0, even if the cell presence / absence response signal of PHY0 becomes valid first, the selection of PHY0 is not performed, and PHY1 whose cell presence / absence response signal becomes valid is selected as the next cell. Is done.
[0045]
When only the PHY0 cell presence / absence response signal becomes valid after the polling period n, PHY0 is selected as the next cell.
[0046]
FIG. 5 is a timing chart when all PHY cell presence / absence response signals are valid, that is, when cell data is received from all PHYs. In this case, PHY1 is selected as the next cell when receiving a cell from PHY0, and PHY2 is selected when receiving a cell from PHY1. The head PHY address (head PHY number) of the polling operation when receiving a cell from PHY0 is “0” (PHY0), and the head PHY address (head PHY number) of the polling operation when receiving a cell from PHY1 is “1”. (PHY1).
[0047]
FIG. 6 is a timing chart when only the cell presence / absence response signal of a specific PHY (PHY0, PHY2, PHY4) is valid. In this case, when a cell is received from PHY0, the cell presence / absence response signal of PHY2 is received first, and PHY2 is selected as the next cell. Similarly, when a cell is received from PHY2, the cell presence / absence response signal of PHY4 is first received, and PHY4 is selected as the next cell. Furthermore, when a cell is received from PHY4, the cell presence / absence response signal of PHY0 is received first, and PHY0 is selected as the next cell.
[0048]
The head PHY address of the polling operation at the time of PHY0 cell reception is “0”, the head PHY address of the polling operation at the time of cell reception from PHY2 is “2”, and the head of the polling operation at the time of cell reception from PHY4 The PHY address is “4”.
[0049]
In the polling operation of such a procedure, the PHY number that is already selected and being received by the cell is not selected until the polling period n ends, even if the cell presence / absence response signal is valid, from the selected PHY number. The polling operation for the next cell is started, and the PHY number is incremented by +1 and polling is continued. In the process, the PHY of the cell presence / absence response signal that becomes valid first is selected as the next cell. Therefore, selection and polling are performed equally for all PHYs, no priority is generated, and fairness of selection can be maintained. As a result, a decrease in performance in the data transmission / reception system is prevented.
[0050]
Instead of the polling algorithm shown in FIG. 3, a polling operation according to the algorithm shown in FIG. 7 is also possible. In this example, similarly to the case shown in FIG. 3, the number of PHY layer devices 20 (0) to 20 (m) is “5”, and the polling cycle n is set to “15”.
[0051]
In this example, polling is performed according to the following basic rules.
[0052]
(1) A data cell from the same PHY as the receiving cell is not selected within the polling period n.
[0053]
(2) Polling is started from the same PHY as the PHY during cell reception.
[0054]
(3) Continue polling while subtracting one PHY number.
[0055]
In FIG. 7, while receiving the cell of PHY0, PHY4 has the highest priority, and then polling is performed according to the priority of PHY3, PHY2, and PHY1. Since PHY0 during cell reception is not selected within the polling period n, polling is again performed according to the priority order of PHY4, PHY3, PHY2, and PHY1 within the polling period.
[0056]
For example, when all PHYs are available for reception, when PHY0 is receiving a cell, PHY4 is the next cell, when PHY4 is receiving a cell, PHY3 is the next cell, and PHY3 is receiving a cell PHY2 is selected as the next cell, PHY1 is selected as the next cell when PHY2 is receiving the cell, and PHY0 is selected as the next cell when PHY1 is receiving the cell.
[0057]
In the polling operation of such a procedure, the PHY number that is already selected and being received by the cell is not selected until the polling period n ends, even if the cell presence / absence response signal is valid, from the selected PHY number. The polling operation for the next cell is started, and the selected PHY number is decremented by 1 and polling is continued. In the process, the PHY of the cell presence / absence response signal that becomes valid first is selected as the next cell. Therefore, selection and polling are performed equally for all PHYs, no priority is generated, and fairness of selection can be maintained. As a result, a decrease in performance in the data transmission / reception system is prevented.
[0058]
As described above, the polling control according to the procedure as described above is executed by the write control unit 100 in the reception interface shown in FIG. The light control unit 100 is configured as shown in FIG. 8, for example.
[0059]
In FIG. 8, the write control unit 100 includes a polling unit 110, a polling control unit 120, and a FIFO control unit 130. The polling unit 110 includes a counter unit and a register unit as will be described later. The polling control unit 120 is configured by a state machine as shown in FIG. The FIFO control unit 130 is a cell buffer. A1 50 (see FIG. 1) write control.
[0060]
The polling control unit 120 is supplied with a cell presence / absence response signal (c) from the external UTOPIA side (PHY layer devices 20 (0) to 20 (m)). The polling state signal (k) from the polling control unit 120 is input to the polling unit 110 and the FIFO control unit 130. The polling unit 110 outputs a PHY address (PHY number) (b) to the external UTOPIA side and the FIFO control unit 130. Input data (a) is input to the FIFO controller 130. The write address (d) and write enable signal (l) from the FIFO control unit 130 and the write data (e) from the polling control unit 120 are supplied to the cell buffer 150 (see FIG. 1).
[0061]
The polling unit 110 is configured as shown in FIG. The polling unit 110 includes the counter unit 111 and the register unit 112 as described above. The counter unit 111 and the register unit 112 are supplied with a polling state signal (k) from the polling control unit 120 (see FIG. 8). The counter unit 111 is in ascending order (see the algorithm shown in FIG. 3) or descending order (shown in FIG. 7) in synchronization with the write clock (f) with 1F interposed from 0 to m−1 (m: the number of PHY layer devices). The count value is generated cyclically (see algorithm). This count value is output from the counter unit 111 toward the PHY layer device as a PHY number (PHY address). In the course of the count operation in the counter unit 111, the count value corresponding to the selected PHY is held in the register unit 112 as the select address (m). Further, the address held in the register unit 112 at the start of polling is supplied to the counter unit 111 as an initial address. The address held in the register unit 112 is supplied to the cell buffer 150 (see FIG. 1) as a PHY address (PHY number) (b).
[0062]
The polling control unit 120 can take a state according to the state machine shown in FIG.
[0063]
As shown in FIG. 9A, this state machine has three states of “initial state state”, “polling state”, and “selection state”. Further, the “polling state” has three states as an internal state machine, as shown in FIG. 9B, a “pre-selection state”, a “polling-only state”, and a “post-selection state”.
[0064]
In the state machine of the polling control unit 120 as described above, when cell reception is started, the state transitions from the “initial state state” to the “polling state”. In the “initial state state”, the following polling operation is performed, but cell data is not transmitted or received.
[0065]
When the polling operation is performed in the “polling state” and the polling cycle ends, the state transitions to the “selection state” for selecting the next cell, and then transitions to the “initial state state” again to start receiving the next cell. To do.
[0066]
If cell data is received immediately thereafter, the state transitions to the “polling state”.
[0067]
In the “polling state”, the transition between the “pre-selection polling state” and the “polling-only state” is continued before the next cell is determined, and the “post-selection polling state” and “ Transition between “polling-only state” continues.
[0068]
The polling state signal (k) representing each state transitioned as described above is supplied from the polling control unit 120 (see FIG. 8) to the polling unit 110 and the FIFO control unit 130. When the polling unit 110 notifies the counter unit 111 that circulates through 1F from 0 to m−1 by using the polling state signal (k), the polling state signal (k) notifies the selection address ( m) is held in the register unit 112. Next, when reception of the next cell is started, the select address (m) held in the register unit 112 is supplied to the counter unit 111 as an initial address (n), and the counter unit 111 sequentially counts from the initial address. Operation (addition by +1 or subtraction by 1 with 1F interposed) is performed. The count value is output as a PHY address (b).
[0069]
A polling unit 110 configured by the counter unit 111 and the register unit 112 operating as described above, a polling control unit 120 that receives a cell presence / absence response signal from the external UTOPIA side, and has a state machine as shown in FIG. The write control unit 100 including the FIFO control unit 130 that receives input cell data and performs write control of the cell buffer 150 follows the procedure shown in FIG. 3 (or FIG. 7), FIG. 4, FIG. Polling control is possible. Therefore, with such a relatively simple configuration, in the selection of the next cell, in a state where fairness is maintained with equal opportunity and no priority for all PHY layer devices 20 (0) to 20 (m). A polling operation is possible.
[0070]
In the above-described example, the UTOPIA level 2 reception (Rx) interface has been described. However, polling control can be performed in the same manner as described above for the UTOPIA level 2 transmission (Tx) interface. In this case, the transmission (Tx) interface is configured as shown in FIG.
[0071]
In FIG. 11, the transmission (Tx) interface includes a write control unit 200, a cell buffer 250, and a read control unit 280. The write control unit 200 controls the writing of input data from the writing device (ATM layer device 10) to the cell buffer 150 in synchronization with the write clock. The read control unit 280 has the same polling and selection function and cell buffer read control function as described above. When the read control unit 280 transmits data cells from the ATM layer device 10 to the plurality of PHY layer devices 20 (0) to 20 (m), the data does not collide and all the PHY layers are transmitted. The polling control can be performed in a state in which the devices 20 (0) to 20 (m) have fairness with equal opportunity and no priority.
[0072]
In the above example, polling for the next cell is started from the PHY number that has already been selected and the cell is being received, but the PHY number has a predetermined value that does not exceed the number of connected PYH layer devices from 0. Polling can also be started from a PHY number obtained by addition or subtraction. Even in this case, it is possible to select all the PHY numbers to be notified.
[0073]
In the above example, the PHY number is changed by 1 in ascending or descending order. However, the present invention is not limited to this, and by specifying the PHY number in ascending or descending order by a number not exceeding the number m of PHY layer devices, It is possible to select all PHY numbers to be notified. However, when the number m of PHY layer devices is an even number, if the PHY numbers are designated in ascending or descending order by a predetermined number of even numbers, it is not possible to select all the PHY numbers to be notified. PHY numbers cannot be generated in any order.
[0074]
Furthermore, the specific number of PHY layer devices described above and the polling cycle are merely examples, and are not limited thereto.
[0075]
【The invention's effect】
As described above, according to the present invention described in claims 1 to 18, by determining the polling start phase, performing the polling operation, and selecting the PHY layer device to be communicated next, Predetermined In the process of selecting a plurality of PHY layer devices in the polling cycle, an PHY layer device having a valid cell presence / absence response signal is cyclically selected in a state where the same PHY layer device is not selected. It is possible to realize a polling control apparatus and method with a relatively simple configuration that can perform selection and polling of a plurality of PHY layer devices connected to each other evenly.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration example of a reception (Rx) interface according to a UTPOA level 2 to which a polling control apparatus according to an embodiment of the present invention is applied.
FIG. 2 is a block diagram showing a configuration example of a data transmission / reception system to which a polling control apparatus according to an embodiment of the present invention is applied.
FIG. 3 is a diagram illustrating an example of a polling algorithm.
FIG. 4 is a timing chart (part 1) illustrating a state of polling control.
FIG. 5 is a timing chart (part 2) showing a state of polling control.
FIG. 6 is a timing chart (part 3) illustrating a state of polling control.
FIG. 7 is a diagram illustrating another example of a polling algorithm.
8 is a block diagram illustrating a configuration example of a write control unit in the reception interface illustrated in FIG. 2. FIG.
9 is a diagram showing a state machine of a polling control unit in the configuration shown in FIG. 8. FIG.
10 is a block diagram illustrating a configuration example of a polling unit in the configuration illustrated in FIG.
FIG. 11 is a block diagram showing a configuration example of a transmission (Tx) interface according to UTPOIA level 2 to which the polling control apparatus according to the embodiment of the present invention is applied;
[Explanation of symbols]
10 ATM layer equipment
20 (0) -20 (m) PHY layer device
100 Light controller
110 Polling part
120 Polling control unit
121 Counter section
122 Register section
130 FIFO control unit
150 cell buffer
180 Lead control unit
200 Light control unit
250 cell buffer
280 Lead control unit

Claims (18)

A polling control apparatus in a data communication system in which an ATM layer device transmits and receives cell data in a asynchronous transfer mode with a plurality of PHY layer devices,
The PHY ID of the PHY layer devices through in Shin in the polling period, the PHY number obtained by shifting by the number of either zero to the total number of the PHY layer devices, to start the operation in the next polling cycle Polling start phase determining means for determining as a polling start phase;
From the PHY number as the polling start phase that is more determined on the polling start phase determining means for each PHY layer devices of each PHY number obtained by shifting cyclically by a predetermined number, to implement the polling operation Polling means;
After polling operation of the polling period is started by the polling implementation means, first the PHY layer device which has received a valid cell whether response signals indicating the ready reception of the cell data, and then to communicate the Selection means for selecting as a PHY layer device,
When the PHY layer device that first receives the valid cell presence / absence response signal is communicating the cell data, the selection unit is configured to transmit the PHY layer device that is currently in communication to the PHY layer to be communicated next. Sequentially select the PHY layer device other than the PHY layer device in communication without selecting it as a device
A polling control device. The polling control device according to claim 1,
Said selecting means, when the PHY layer devices the cell whether the response signal in addition to the PHY layer device in communication is enabled in the polling period is not present, the selection of the PHY layer devices in the communication A characteristic polling control device. In the polling control device according to claim 1 or 2,
The polling start phase determining means, from the PHY number of the PHY layer devices in communication, the polling control unit the PHY number shifted by zero, characterized in that the above polling start phase. In the polling control device according to any one of claims 1 to 3,
The polling implementation means, the polling control unit which comprises carrying out the polling operation in ascending order from-determined PHY number as the polling start phase. In the polling control device according to any one of claims 1 to 3,
The polling implementation means, the polling control unit which comprises carrying out the polling operation in descending order from-determined PHY number as the polling start phase. In the polling control device according to any one of claims 1 to 5,
Predetermined number the polling implementation means offset from PHY number determined as the polling start phase, the polling control unit, characterized in Rukoto set be one or more of the number of total number following the PHY layer device. The polling control device according to claim 6, wherein
If the total number of the PHY layer devices is an even number, the predetermined number is set to the number that do not even-polling control apparatus according to claim Rukoto. In the polling control device according to any one of claims 1 to 7,
The polling implementation means, offset from the PHY number determined as the polling start phase by the predetermined number, performed cyclically counting within a total number of the PHY layer device, the count value as a new PHY ID It has a counting part to output,
It said selection means includes a register unit for storing a PHY number for specifying the PHY layer device to be next communication count value is output as under PHY number for a given condition from said counting unit,
Controls the counting operation of the counting unit based on the cell whether the response signals from a plurality of PHY layer devices, control supplies a state signal for providing the predetermined condition with respect to the selection means to said selection means Ru equipped with a means
A polling control device. The polling control device according to any one of claims 1 to 8,
In accordance with the provisions of the UTOPIA level 2 1 cell whether the response signal system, polling, characterized in that the ATM layer device is applied to the data communication system for transmitting and receiving cell data in a plurality of the PHY layer device and Asynchronous Transfer Mode Control device. A polling control method in a data communication system in which an ATM layer device transmits and receives cell data in a asynchronous transfer mode with a plurality of PHY layer devices,
A polling start phase determining means, a polling executing means and a selecting means;
The polling start phase determining means, the PHY ID of the PHY layer devices in communication in the polling period, the PHY number obtained by shifting by the number of either zero to the total number of the PHY layer devices, the following A polling start phase determination procedure for determining a polling start phase for starting operation at a polling cycle of
Said executing polling means, the PHY ID of a more determined above polling start phase to the polling start phase determining means for each PHY layer devices of the plurality of PHY number obtained by shifting cyclically a predetermined number , a polling implementation procedure for implementing a polling operation,
It said selection means, from the polling operation of the polling period is started by the polling implementation means, the PHY layer device which has received a valid cell whether response signals indicating the ready reception of the cell data in the first, next and a selection procedure for selecting as the PHY layer device to be communicated to,
In the selection procedure by the selection means, when the PHY layer device that first receives the valid cell presence / absence response signal is communicating the cell data, the PHY layer device in communication is communicated next. The PHY layer device other than the PHY layer device that is currently in communication is sequentially selected without being selected as the PHY layer device
A polling control method characterized by the above . The polling control method according to claim 10,
The above selection procedure, when the PHY layer devices the cell whether the response signal in addition to the PHY layer devices in communications in the polling period is enabled does not exist, the selection of the PHY layer devices in the communication A characteristic polling control method. The polling control method according to claim 10 or 11,
The polling start phase determination procedure, the polling control method of the PHY number shifted from the PHY ID of the PHY layer devices in communication only zero, characterized in that the above polling start phase. The polling control method according to any one of claims 10 to 12,
The polling implementation procedures, the polling control method which comprises carrying out the polling operation in ascending order from the PHY number determined as the polling start phase. The polling control method according to any one of claims 10 to 12,
The polling implementation procedures, the polling control method which comprises carrying out the polling operation in descending order from the PHY number determined as the polling start phase. The polling control method according to any one of claims 10 to 14,
The predetermined number of polling implementation procedure is shifted from the PHY number determined as polling start phase, polling control method comprising Rukoto is set to the number of total number following a by the PHY layer device 1 or more. The polling control method according to claim 15, wherein
If the total number of the PHY layer devices is an even number, the polling control method comprising Rukoto the predetermined number is set to the number that do not even. The polling control method according to any one of claims 10 to 16,
The polling implementation procedure shifted from the PHY number determined as the polling start phase by the predetermined number, performed cyclically counting within a total number of the PHY layer device, the count value as a new PHY ID Has a counting procedure to output,
The above selection procedure has the steps of storing in the register as PHY number for identifying the PHY layer device to be next communication count value is output as under PHY number of predetermined conditions by the counting procedure,
Controls the counting operation of the counting unit based on the cell whether the response signals from a plurality of PHY layer devices, control procedure to provide the state signal for providing the predetermined condition with respect to the selection procedure in the selection procedure Ru with a
A polling control method characterized by the above . The polling control method according to any one of claims 10 to 17,
In accordance with the provisions of the UTOPIA level 2 1 cell whether the response signal system, polling, characterized in that the ATM layer device is applied to the data communication system for transmitting and receiving cell data in a plurality of the PHY layer device and Asynchronous Transfer Mode Control method.

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