ADM6308 データシートの表示（PDF） - Unspecified

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ADM6308

Eight-port 10/100M Ethernet Switch Controller

Unspecified 

Olive plus Specification

11

Function Description

ADM6308 is a high performance, low cost, quality assurance 8-port Fast Ethernet Controller dedicated to 8-port switch

solutions. This chip operates at 50MHz and fully complies with IEEE 802 series specifications, including MAC and Physical

layers.

The switch operations include forwarding scheme, packet filtering, address learning, buffer management, LED display, etc.

Packets from Reduced MII interface should be stored in the memory. Then, source address learning, packet filtering, and

retransmission to known or unknown port(s) is implemented based on real application.

Reset and Restart

When ADM6308 is on, it starts in embedded memory self-test mode.

Port Interface

10/100Mbps Reduced MII Interface

Each port of ADM6308 supports Reduced MII interfaces, which uses six pins, TXE0~7, TXD0~7[1:0], RXDV0~7,

RXD0~7[1:0]. Feature setting can be chosen by configuration pin. The RMII specification has the following characteristics:

1. It supports 10Mbps and 100Mbps data rates

2. A single clock reference sources from the MAC to PHY (or from an external source)

3. It provides independent 2-bit wide (di-bit) transmit and receive data paths

RMII Specification Signals

Signal Name Direction with Direction with respect

Usage

respect to PHY

to the MAC

REFCLK

Input

Input or Output Synchronous clock reference for receive, transmit

and control interface

RXDV

Output

Input

Carrier Sense

RXD[1:0]

Output

Input

Receive Data

TXE

Input

Output

Transmit Enable

TXD[1:0]

Input

Output

Transmit Data

All detail pin description (please see pin assignment).

In addition, ADM6308 also provides the MII mode at port 0 only. The relevant settings are described in the previous pages of

pin description.

Buffer Management

The buffer memory is embedded in ADM6308 for eight port switch operations, which are designed based on output queuing

and dynamic shared memory management architecture.

Media Access Control

ADM6308 implements all functions of IEEE 802.3 MAC protocol such as frame formatting, collision handling, etc. ADM6308

generates 56-bit preamble and Start of Frame delimiter while a packet is being sent. In half-duplex mode, listening before

transmitting allows to prevent traffic jam. Whenever a collision occurs, packet will be delayed for a random time, then be re-

sent.

EEPROM or Dynamic configured by 8051

EEPROM is a configuration option for 8-port switch setting. This setting can also be called through Recall pin triggered by the

controller like 8051.

1. EEPROM recall after power-on is reset.

ADMtek Incorporated

00/04/25

1F, No 9, Industrial E. 9th Road, SBIP, Hsin-Chu

Version : 1.10

Tel : (03)578-8879 Fax : (03)578-8871

ADMtek Incorporated Confidential

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