RTL8308B Ver la hoja de datos (PDF) - Realtek Semiconductor

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RTL8308B

REALTEK SINGLE CHIP 8-PORT 10/100 ETHERNET SWITCH CONTROLLER WITH EMBEDDED MEMORY

Realtek Semiconductor 

RTL8308B

6.2.5 Illegal Frames

During the receiving process, the MAC will monitor the length of the received frame. Illegal frames such as a bad

CRC packet, runt packet (less than 64 bytes) or oversized packet (greater than 1536) will be discarded.

If the carrier sense (CRS) signal in the RMII interface is asserted and RXD[1:0] at the beginning of the packet is

‘10’, the port is considered to have a false carrier event. Normal carrier has a preamble value of ‘01’. The false

carrier event is recorded for the MIB counter.

The RTL8308B can handle frames up to 1536 bytes. All frames longer than 1536 byte will be discarded. If the port

continues to receive data after the 1536th byte, the port’s data will be filtered. If the port is in half duplex mode, the

port will no longer be able to transmit or receive data during the long packet reception.

6.3 EEPROM Interface

The serial EEPROM interface is designed to load information required by various optional functions. The interface

implements the SDA signal and it is directly compatible with the 93C46 device. The controller reads, in serial

format, in the first 272 bits (seventeen 16-bit words) out of the EEPROM and stores them in registers. Because the

information stored in EEPROM is static, this read occurs only on power-up. The serial EEPROM shifts out the

most significant bit of the word first.

2002/01/23

11

Rev. 2.0

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