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RTL8305SC

SINGLE-CHIP 5-PORT 10/100MBPS SWITCH CONTROLLER WITH DUAL MII INTERFACES

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RTL8305SC

Datasheet

The RTL8305SC supports 16 VLAN groups. These can be configured as port-based VLANs and/or

IEEE 802.1Q tag-based VLANs. Two ingress filtering and egress filtering options provide flexible

VLAN configuration:

• Ingress filtering option 1: The Acceptable Frame Type of the Ingress Process can be set to ‘Admit

All’ or ‘Admit All Tagged’.

• Ingress filtering option 2: ‘Admit’ or ‘Discard’ frames associated with a VLAN for which that

port is not in the member set.

• Egress filtering option 1: ‘Forward’ or ‘Discard’ ARP broadcast frames.

• Egress filtering option 2: ‘Forward’ or ‘Discard’ Leaky VLAN frames.

The RTL8305SC supports several types of QoS functions with two-level priority queues to improve

multimedia or real-time networking applications. The QoS functions are based on:

• Port-based priority

• 802.1Q VLAN priority tag

• The TOS/DS (DiffServ) field of TCP/IP

When the QoS function is enabled, a VLAN tag can be inserted or removed at the output port. The

RTL8305SC will insert a Port VID (PVID) for untagged frames or remove the tag from tagged frames.

The RTL8305SC also supports a special insert VLAN tag function to separate traffic from WAN and

LAN sides in Router and Gateway applications.

In router applications, the router may want to know which input port this packet came from. The

RTL8305SC supports Port VID (PVID) for each port and can insert a PVID in the VLAN tag on egress.

Using this function, VID information carried in the VLAN tag will be changed to PVID. The

RTL8305SC also provides an option to admit VLAN tagged packets with a specific PVID only. If this

function is enabled, it will drop non-tagged packets and packets with an incorrect PVID.

Maximum packet length can be 1536 or 1552 bytes according to the initial configuration (strapping upon

reset). The filtering function is supported for the 802.1D specified reserved multicast addresses (01-80-

C2-00-00-02 and 01-80-C2-00-00-04 to 01-80-C2-00-00-0F).

5-port 10/100Mbps Single-Chip Dual MII Switch Controller 2

Track ID: JATR-1076-21 Rev. 1.2

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