RTL8305SB Datasheet PDF

Realtek RTL8305SB

The RTL8305SB is a 5-port Fast Ethernet switch controller that integrates memory, five MACs, and five physical layer transceivers for 10Base-T and 100Base-TX operation into a single chip. The five ports are separated into 3 groups (GroupX/GroupY/Port4) for flexible port configuration using strapping pins upon reset. The SetGroup pin is used to select port members in GroupX and GroupY.

Part No.	RTL8305SB
Datasheet	RTL8305SB Download
Manufacturer	Realtek
Description	SINGLE CHIP 5-PORT 10/100MBPS SWITCH CONTROLLER
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GENERAL DESCRIPTION

All ports support 100Base-FX, which shares pins (TX+-/RX+-) with UTP ports and needs no SD+/- pins, a development using Realtek proprietary technology. To compensate for the lack of auto-negotiation in 100Base-FX applications, the RTL8305SB can be forced into 100Base-FX half or full duplex mode, and can enable or disable flow control in fiber mode. When the port members have been determined, you may use a mode selection pin (GxMode/Gymode/P4Mode[1:0]) to select operating interfaces such as 10/100Base-TX, 100Base-FX. Each group has 4 pins for selecting initial port status (ANEG/Force, 100/10, Full/Half, Enable/Disable Flow Control) upon reset. Upon reset, in addition to using strapping pins, the RTL8305SB also can be configured with an EEPROM or read/write operation by a CPU through the MDC/MDIO interface. The fifth port (port 4) supports an external MAC interface, which can be set to PHY mode MII, PHY mode SNI, or MAC mode MII to work with a routing engine, HomePNA, or VDSL transceiver.