KR100232870B1 - Mii-ir bus connection apparatus - Google Patents

Abstract

The present invention relates to an apparatus for connecting a media access controller having a media access control bus with a relay interface circuit in a hub in configuring an Ethernet 100 base-x management hub, wherein the media independent interface bus of the media access controller is relayed. A connection device between a media independent interface bus and a repeater interface bus, which converts into a form of a signal connectable to a mutual repeater bus, which is a connection bus between interface circuits, is constituted.

Description

MII-IR bus interface

The present invention relates to an interface device for implementing a 100 base-x management hub, and includes a media access controller (hereinafter referred to as a MII bus). (Referred to as a MAC controller) to a repeater interface controller (hereinafter referred to as RIC) in a hub, and the MII bus of the MAC controller is connected to the RIC inter-repetitor bus (hereinafter referred to as RIC). MII-IR bus connection device characterized in that the conversion into a signal form that can be connected to the IR bus.

The 100Mbps Ethernet Repeater is generally configured using a RIC having a twisted pair port, and in order to expand the number of ports, such a RIC is extended by the required number of ports. In order to connect multiple RICs, an IR interface is usually included, which forms an IR bus.

All Ethernet packets from each port of the hub are forwarded to other RICs via the IR bus. In the case of a managed hub, it must have the ability to inspect all packets originating and forwarding inside the hub.

Since the packet recovery function is performed through the Ethernet MAC controller, the MAC controller must be connected to the IR bus.

When the MAC controller is connected to the IR bus, each terminal connected to the hub can communicate with the CPU through the MAC controller. In the case of a managed hub, since the central processing unit manages network management information and other hub operating states, such a media access controller enables each terminal to obtain necessary information from the central processing unit or to control the operation of the hub. Becomes possible.

An object of the present invention is to provide a connection device constituting a managed hub by connecting the MII bus and the IR bus through a connection device for connection between the MII bus and an IR interface bus having a DP83850 or similar structure manufactured by National Semiconductor. .

1 is a conventional repeater internal structure and RIC connection diagram

Figure 2 is a connection diagram of the MII-IR bus connection device according to the present invention

* Explanation of symbols for main parts of the drawings

1-10: Twist Peo Port 1-20: Repeater Interface Controller

1-30: Mutual Repeater Bus 1-40: Media Access Controller

1-50: Media Independent Interface Bus 1-60: Central Processing Unit

1-70: Media Independent Interface Bus-Mutual Repeater Bus Interface

10: comparator 20,70,80,90,100,110: three phase gate

40,60,120,190,200,210,220: negative gate

30,50,130: Logic gate 140,150,160,170,180: Multiplexer

300: TxEn 310: TxEr at the MII bus connection

320: TxC 330: TxD [3: 0] of the MII bus connection

340: RxD [3: 0] 350: RxC

360: COL 370: RxEr

380: RxDV 390: CRS

400: RID [4: 0] 410: IR_VECTOR [4: 0]

420: _ACTIVEO 430: _IR_COL_OUT

440: IR_ODIR / TxEn 450: _IR_ACTIVE / CRS

460: TxEr at IR bus connection 470: _IRDD_ER / RxEr

480: 25 MHz / TxC 490: _IRD_CK / RxC

500: TxD [3: 0] at IR bus connection 510: IRD [3: 0] / RxD [3: 0]

520: _IRD_V / RxDV 530: _IR_COL_IN / COL

540: IR_MODE

The MII-IR bus connection circuit according to the present invention includes a TxEn circuit having a transmit enable function, a TxEr circuit indicating a transmission error, a TxC circuit transmitting a transmission clock, a TxD circuit having a data transmission function, and an RxC circuit receiving a clock. MII consisting of an RxD circuit for receiving data, an RxDV circuit for validating received data, a COL circuit for detecting a collision between the MII bus and an IR interface bus, and a CRS circuit for detecting a carrier RID [4: 0] with bus connection and repeater definition, IR_VECTOR [4: 0] to send IR vector or arbitration signal, _ACTIVEO to output active output, _IR_COL_OUT to output IR collision detection, IR data IDR_OUT to send data in the output direction, _IR_ACTIVE to send the relay activation signal, _IRD_ER to send the IR data error signal, _IR to supply the IR clock signal IR bus connection consisting of D_CK, IRD [3: 0] for transmitting data over IR bus, _IRD_V for detecting the validity of IR data, IR bus and MII bus mode selector IR_MODE, three-phase gate (20, 70, 80, 90, 100, 110, multiplexing devices 140, 150, 160, 170, 180 and the like is composed of an internal circuit.

The MII-IR bus connection device according to the present invention is shown in FIG. 2, and the configuration and operation of the connection device between the MII bus and the IR interface bus will be described in detail below.

The MII-IR bus connection device according to the present invention can operate in the IR bus mode or the MII bus mode and can set the operation mode by the IR_MODE signal.

In order to convert the MII bus signal of the MAC controller to the IR interface signal using the MII-IR bus connection device, RID [4: 0] (400), IR_VECTOR [4: 0] (410), _ACTIVEO (420), and IR_COL_OUT A signal such as 430 is used.

The MII-IR bus access device sets a logic '1' to IR_MODE, which is a mode selection circuit, to operate as an IR bus. The RID [4: 0] signal of the MII-IR bus interface device gives the IR bus an appropriate ID among the 0 to 30 values of the devices connected in the design of the system, and the equipment that wants to occupy the IR bus is IR_VECTOR [4: 0]. The signal set in RID [4: 0] must be output to

The IR_VECTOR [4: 0] signal is outputted with the RID [4: 0] signal when the three-phase gate 30 is activated. The activation of the three-phase gate is activated when both the TxEn signal and the IR_MODE signal are activated.

That is, when the selection signal of the IR bus and the transmission request signal of the MAC controller are applied to the AND gate 30, the RID [4: 0] signal appears at the output of the IR_VECTOR.

Also, if no other device uses the IR bus, the read back value of IR_VECTOR [4: 0] is equal to RID [4: 0], which indicates no collision on the IR bus.

When there is an IR_MODE signal and a MAC transmission request signal, a signal generated by the MAC controller can be transmitted to the IR interface bus using the above signal, and multiplexer (140, 150, 160, 170, 180). Through this, signals input from the IR interface bus can be transferred to the MAC controller.

In particular, the signal lines of the COL 360, RxEr 370, RxDV 380, and ERS 390 are not gates 190, 200 because polarities vary depending on the IR interface bus and the MII bus. After switching the polarity through the 210 and 220, the input of the required polarity is transmitted according to the bus setting mode of the IR_MODE. When the connection device 70 according to the present invention operates in the IR interface bus mode, signal lines of the TxEr 460 and the TxD 500 are not used, and a 25 MHz clock signal must be input to the TxC 490 signal line.

If there is data that the MAC controller wants to transmit to the IR interface bus, it activates the TxEn 300 signal and, accordingly, the three-phase gate is activated to output the value set in the RID to the IR_VECTOR 410. The IR_VECTOR value is wired ORed with the signal of another RIC on the IR interface bus, so when a bus usage request is made from another RIC, the value appearing on the actual bus is different from the value set in the RID. The comparator 10 compares the RID value with the IR_VECTOR value to monitor for collisions between the RICs.

In the case of data transmission from the MAC controller to the IR bus side, the RxC 350 signal should not be input to the media access controller. Therefore, the RxC 350 signal is not inputted when transmitting through the negative gate 120 and the AND gate 130. To avoid.

When the MAC controller is in receive mode, the TxEn signal is disabled, and thus the three-phase gate (70, 80, 90, 100, 110) is disabled and Ethernet packets from the IR interface bus are forwarded to the MAC controller. do. In the receive mode, the negative gate 120 and the AND gate 130 are activated so that the clock transmitted from the IR interface bus is transferred to the MAC controller.

When the IR_MODE selection signal is applied as '0', the AND gate 30 is disabled so that all three-phase gates 20, 70, 80, 90, 100, and 110 are disabled, so that TxEr 460 and TxD 500 are disabled. In addition, it can be connected to the MII bus and operated in normal MII bus mode.

At this time, the RID [4: 0] 400, IR_VECTOR [4: 0] 410, _ACTIVE 420, and _IR_COL_OUT 430 signal lines are not used.

Table 1 and Table 2 below briefly describe the types and functions of MII bus signals and IR bus signals, respectively.

Media Independent Interface Bus Signals Signal name I / O mode function Functions like the inter-relay interface bus TxC input Clock transmission IRD_CK TxD [3: 0] Print Send data IRD [3: 0] TxEn Print Activation Send IRD_DV TxEr Print Send error IRD_Er RxC input Clock reception IRD + CK RxD [3: 0] input Receive data IRD [3: 0] RxEr input Reception error IRDD_Er RxDV input Receive valid data IRD_DV COL input Crash guard IR_COL CRS input Carrier surveillance IR_ACTIVE

Mutual Repeater Interface Bus Signals Signal name I / O mode Activation function IR_VECTOR [4: 0] Bi / OC Mutual Repeater Vector, Arbitration Signal RID [4: 0] input Repeater Definition _ACTIVEO Output / OC Low Activation output _IDR_ODIR Print High Mutual Repeater Data to External Output _IR_ACTIVE Bi / OC Low Repeater activation _IR_COL_IN input Low Mutual Repeater Collision Input _IR_COL_OUT Output / OC Low Mutual Repeater Collision Output _IRD_ER Bi Low Mutual Repeater Data Error _IRD_CK Bi Mutual Repeater Data Clock IRD [3: 0] Bi Mutual Repeater Data _IRD_V Bi Low Mutual Repeater Valid Data

_ACTIVEO in Table 2 above is an active state low signal indicating that the MAC controller is successfully using the IR bus, and the value read back from the IR_VECTOR [4: 0] of the comparator 10 ( read back value) will be displayed.

The _IR_COL_OUT signal is activated when the three-phase gate 30 is activated when there is a data transmission request from the MAC controller, and when the output of the comparator 10 is different. It is used to signal that a collision has occurred in the IR bus.

The IR_ODIR 440 signal has the same function as TxEn.

The IR_ACTIVE 450 activates the three-phase gate 70 according to the output of the three-phase gate 30 when a transmission request from the MAC controller occurs. The _IR_ACTIVE 450 signal passes through a NOT gate when the IR bus is selected, is converted to the MII bus CRS 390 via the multiplexer 220, and transmitted to the MAC controller side.

The TxEr 460 signal is used only when the MII bus is selected and uses the MII bus signal as it is.

Since the _IRD_ER 470 signal should be generated when the MAC controller intentionally generates the TxEr signal, the TxEr signal is input to the three-phase gate 80 and the output of the AND gate 30 is used as the three-phase gate enable signal. Generate. The _IRD_Er signal is converted into an RxEr signal through the negative gate 200 and the multiplexer 160 when the IR bus is selected, and transmitted to the MAC. When the MII bus is selected, the MII bus is passed through the multiplexer 160 and then connected to the MII bus RxEr signal and transmitted to the MAC controller.

When the IR bus is selected, the 25 MHz / RxC 480 signal applies a 25 MHz clock to be used as the transmit clock TxC of the MII bus, and in the case of the MII bus, it is used as a general TxC signal line.

The _IRD_CK 490 signal outputs a 25 MHz clock signal to the _IRD_CK 490 when a request is made by the MAC controller according to the AND gate 30 signal when the IR bus is selected.

The _IRD_CK 490 signal passes through the AND gate 130 and the multiplexer 140 and is converted into a received clock RxC signal of the MII bus and transmitted to the MAC controller. The AND gate 30 is determined to be activated by the negative gate 120 to prevent the _IRD_CK signal from being transmitted to the RxC when the MAC controller transmits a request.

The TxD [3: 0] (500) signal is used only when the MII bus is selected, and the TxD [3: 0] of the MII bus is used as it is.

IRD [3: 0] is a three-phase gate 100 activated when the MAC controller transmits data so that the TxD [3: 0] signal is transferred to the IRD [3: 0] bus. In the case of receiving the MAC controller, the IRD [3: 0] signal is directly transmitted to RxD [3: 0]. In practice, the IRD [3: 0] signal is always delivered to RxD [3: 0], but the RxD value is recognized by the MAC controller only when the RxC 140 receives the activated MAC controller.

The _IRD_V 520 signal is activated during the data transmission operation of the MAC controller.

The _IR_COL_IN 530 signal is passed to the COL 360 of the MII bus through the negative gate 190 and the multiplexer 150 when selected as the IR-bus. If the MII bus is selected, the COL 530 signal is directly input.

The present invention provides an apparatus for connecting a MAC controller having an MII bus proposed in IEEE 802.3u to an IR bus having a structure similar to that of National Semiconductor.

The device according to the invention is an essential circuit for constructing a managed hub. In particular, the circuit of the present invention allows connection to an IR interface bus or MII bus depending on the external configuration.

Claims (2)

A TxEn circuit having a transmit enable function; A TxEr circuit representing a transmission error; A TxC circuit for transmitting a transmission clock; A TxD circuit having a function of transmitting data; An RxC circuit for receiving a clock; An RxD circuit for receiving data; An RxDV circuit for receiving valid data; A COL circuit having a function of detecting a collision between a media independent interface bus and a mutual repeater interface bus; And An MII connection unit having a connection function with a media independent interface bus including a CRS circuit for detecting a carrier; RID [4: 0] with repeater definition function; IR_VECTOR [4: 0] for transmitting a mutual repeater vector or arbitration signal; _ACTIVEO producing an active output; _IR_COL_OUT to output mutual repeater collision detection; IDR_ODIR for transmitting to the mutual repeater data output direction; _IR_ACTIVE to transmit a relay activation signal; _IRD_ER for transmitting a mutual repeater data error signal; _IRD_CK which supplies mutual repeater clock signal; IRD [3: 0] for transmitting data over a mutual repeater bus; _IRD_V for detecting validity of mutual repeater data; A repeater-medium independent interface bus connection consisting of; Mutual Repeater-Media Independent Interface Bus Mode Selector IR_MODE; Three-phase gates 20, 70, 80, 90, 100, 110; And MII-IR bus connection device comprising an internal circuit including a multiplexing device (140, 150, 160, 170, 180) The method according to claim 1, Multiplexer 140, 150, 160, 170, 180; Inverter gates 190, 200, 210, 220; A TxEr circuit indicating a transmission error of the repeater interface bus section; A TxD circuit having a function of transmitting data; And An IR_MODE unit having a mode selection function of an interface; MII-IR bus connection device characterized in that it does not include

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