RTL8304E数据手册Realtek中文资料规格书

描述 Description

The RTL8304E-CG is a 4-port Fast Ethernet switch controller that integrates memory, four MACs, and two physical layer transceivers for 10Base-T and 100Base-TX operation into a single chip.
 
The RTL8304E supports two MII/RMII interface for external devices to connect to the 3rd and 4th MACs. The external device could be a routing engine, HomePNA, HomePlug, or another processor depending on the application.
 
The RTL8304E supports several advanced QoS functions with four-level priority queues to improve multimedia or real-time networking applications, including:
·       Multi-priority assignment
·       Differential queue weight
·       Port-based and queue-based rate limitation
·       16-entry ACL for advanced packet control application
 
For multicast applications, the RTL8304E supports IGMPv1/v2/v3 and MLDv1/v2 snooping.
 
To meet security and management requirements, the RTL8304E supports IEEE 802.1x Port-based/MAC-based Access Control, MAC Address Limits, Port Isolation, Port Mirroring, and also supports five 32-bit MIB Counters on each port.
 
The RTL8304E supports 16 VLAN groups. These can be configured as port-based VLANs and/or 802.1Q tag-based VLANs. The RTL8304E also supports VLAN translation and QinQ.
 
The RTL8304E contains a 2K-entry address lookup table. Two 4-way associative hash algorithms avoid hash collisions and maintain forwarding performance. The 2K-entry table provides read/write access from the SMI interface, and each of the entries can be configured as a static entry that does not automatically age out and can only be controlled by the external management processor. For IGMP/MLD snooping application, each of the 2K entries can be configured as a multicast entry that indicates the matched packets will be forwarded to specific multi ports. For IEEE 802.1x application, each of the 2K entries can be configured as an authorized or unauthorized entry.
Maximum packet length can be 2047 bytes. Two types of independent storm filter are provided to filter packet storms, and an intelligent switch engine prevents Head-of-Line blocking problems. The filtering function is supported for IEEE 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).
 
The RTL8304E provides flexible LED functions for diagnostics. An externally managed processor can control the LEDs via SMI.
 
The RTL8304E supports Realtek’s Green Ethernet power saving mode, as well as Energy-Efficient Ethernet mode (EEE; defined in IEEE 802.3az) to minimize system power consumption. When the Green Ethernet Feature is enabled, the RTL8304E provides link-on and dynamic detection of cable length and dynamic adjustment of power required for the detected cable length. This feature provides high performance with minimum power consumption.
 
Energy-Efficient Ethernet (EEE) supports Low Power Idle Mode. When Low Power Idle Mode is enabled, systems on both sides of the link can disable portions of the functionality and save power during periods of low link utilization.
 
For whole system power saving, the RTL8304E supports the Wake-on-LAN (WOL) function and provides control signals to manage the system power based on the port linkage and the traffic loading of the CPU port.
 
To simplify the peripheral power circuit, the RTL8304E can use a low-cost PNP transistor to generate 1.8V from a 3.3V power supply.
 

特性 Features

Basic Switching Functions
4-port switch controller with 2 transceivers for 10Base-T and 100Base-TX and 2-port (T)MII/RMII
Non-blocking wire-speed reception and transmission and non-head-of-line-blocking forwarding
Complies with IEEE 802.3/802.3u auto-negotiation
Built-in high efficiency SRAM for packet buffer, with 2K-entry lookup table and two 4-way associative hash algorithms
2047 byte maximum packet length
Flow control fully supported:

Half duplex: Back pressure flow control
Full duplex: IEEE 802.3x flow control
Service Quality
Supports high performance QoS function on each port:

Supports 4-level priority queues
Weighted round robin service
Supports strict priority
Input/Output port bandwidth control
Queue based bandwidth control
ACL-based, 1Q-based, Port-based, DSCP-based, VID-based, IP address-based, and other types of priority assignments
Supports 16-entry ACL for advanced applications
Supports IEEE 802.1p Traffic Re-marking
Supports IGMP v1/v2/v3 and MLD v1/v2 snooping
Security and Management
Supports MAC Limit
Supports Port Isolation
Supports IEEE 802.1x
Lookup Table is accessible via SMI
Supports 32-bit smart counter for per port RX/TX byte/packet count, collision counter, and error counter
Supports reserved control frame filtering
Supports advanced storm filtering
Supports Port Mirroring
Supports interrupt for CPU application
Supports proprietary CPU tag for traffic management
Supports SMI (Serial Management Interface) for programming and diagnostics
Optional EEPROM interface for configuration
VLAN Functions
Supports up to 16 VLAN groups
Flexible 802.1Q port/tag-based VLAN
Supports VLAN translation
Supports QinQ
Leaky VLAN for ARP/unicast/IP multicast packets
Supports external processor to maintain greater than 16 VLAN groups
Power Saving Functions
Green Ethernet Feature
Supports Energy-Efficient Ethernet (EEE) function (IEEE 802.3az)
Supports Wake-on-LAN (WOL)
Supports system power management based on link and CPU port traffic loading
Diagnostic Functions
Supports IEEE 802.1D
Supports hardware loop detection function with LEDs and buzzer to indicate the existence of a loop
Supports cable diagnosis (RTCT function)
Supports MAC and PHY loopback function for diagnosis
Flexible LED indicators for link, activity, speed, as well as user defined LED output

Loop status indication
LEDs blink upon reset for LED diagnostics
Other Features
Optional MDI/MDIX auto crossover for plug-and-play
Physical layer port Polarity Detection and Correction function
Robust baseline wander correction for improved 100Base-TX performance
25MHz crystal or 3.3V/1.8V OSC input
Single 3.3V power input can be transformed to 1.8V via a low-cost external BJT transistor
Low power, 1.8/3.3V, 0.153µm CMOS technology
64-pin QFN ‘Green’ package