RTL8305SC Switch Board

Recently, I have made a 4-port lan switch using RTL8305SC-VD-LF.You can add internal lan switch to your own design. This project contains schematic , PCB and LOM . The format is Altium designer.
If you need this design for your project write me an email : rosseta.com@gmail.com

General Description:
The RTL8305SC 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. 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 RTL8305SC can be forced into 100Base-FX half or full duplex mode, and can enable or disable flow control in fiber mode.

The five ports are separated into three 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.

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 four pins for selecting initial port status upon reset (ANEG/Force, 100/10, Full/Half,

Enable/Disable Flow Control). Upon reset, in addition to using strapping pins, a CPU can also configure the RTL8305SC via the MDC/MDIO interface.

The fifth port (port 4) supports an external MAC and an external PHY interface. The external MAC

interface can be set to PHY mode MII, PHY mode SNI, or MAC mode MII to work with a routing

engine, HomePNA, or VDSL transceiver. The external PHY interface can be set to PHY mode MII in the digital interface, and UTP or fiber in the differential interface. In order to accomplish diagnostics in complex network systems, the RTL8305SC also provides a loopback feature in each port for a variable CPU system.

The RTL8305SC contains a 1K-entry address lookup table and supports a 16-entry CAM to avoid hash collisions and to maintain forwarding performance. The 1K-entry table provides read/write access from the SMI interface, and each of the entries can be configured as a static entry. A static entry indicates that this entry is controlled by the external management processor and automatic aging and learning of the entry will not take place. The RTL8305SC supports IEEE 802.3x full-duplex flow control and backpressure

half-duplex flow control. A broadcast storm filtering function is provided to filter unusual

broadcast storm issues, and an intelligent switch engine prevents Head-Of -Line blocking problems.