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Realtek
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RTL8308 Datasheet Preview

RTL8308 Datasheet

(RTL8306 / RTL8308) 8/6-Port 10/100 Mbps Ethernet Switch Controller

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RTL8308 pdf
8308/8306 Preliminary Product Specification
Subject to change
Realtek 8/6-Port 10/100 Mbps
Ethernet Switch Controller
with Embedded memory
The RTL8308/8306 chip is a 128-pin low cost and ultra low power consumption 8/6-port
10/100M Ethernet switch controller integrated both with a 2M bits embedded DRAM as packet
buffer and a 16K entries of address table. The RTL8308 supports reduced MII (RMII) interface.
Only single 50MHz oscillator is needed in a switch system to save your Bill Of Material. In
addition, the RTL8308/8306 provides a LED display specially to indicate a network loop
existence.
www.DataSheet.co.kr
1. Features
n Support eight/six 10/100Mbps Ethernet ports
with RMII interface
n Provided non-blocking and non-head-of-line-
blocking forwarding
n 50MHz 2M bits DRAM is built in as packet
storage buffer. Page based buffer management
to efficiently utilize the internal packet buffer
n Ultra low power consumption with less than
180mA at 3.3V operating voltage
n Embedded 16K entries of look-up table and
128 entries of CAM
n Support address hashing or direct mapping for
look-up table. 128-entry CAM is used to
eliminate the hash collision problem
n Support full and half duplex operations
n Link, speed and duplex status are auto-
detected via MDIO
n Flow control fully supported:
l Half-duplex: back pressure
l Full-duplex: IEEE 802.3X
n Auto-negotiated Full-duplex flow control by
writing the ability via MDIO to external PHY
n Support store-and-forward and cut-through
n Provide a LED display especially to indicate a
network loop existence
n Broadcast storm control
n Reversible PHYAD order for diverse PHY
n 24C02 interface
n 128-pin PQFP, 0.35 um, 3.3V CMOS
technology
1 99/10/26
Datasheet pdf - http://www.DataSheet4U.net/



Realtek
Realtek

RTL8308 Datasheet Preview

RTL8308 Datasheet

(RTL8306 / RTL8308) 8/6-Port 10/100 Mbps Ethernet Switch Controller

No Preview Available !

RTL8308 pdf
2. General Description
8308/8306 Preliminary Product Specification
Subject to change
The RTL8308/8306 provides eight/six 10/100 Mbps RMII Ethernet ports. Each port can operate in 10
Mbps or 100 Mbps data rate, and in full or half duplex mode. Speed, duplex and link status can be
acquired by periodically polling the status of the PHY devices via MDIO.
2M ( or 32K x 64 ) bits, or 256K bytes DRAM operating in 50MHz clock is built-in as packet storage
buffer. To efficiently utilize the packet buffer, the RTL8308/8306 divides the 256K bytes DRAM into 1K
pages of storage spaces, i.e., per page contains 256 bytes. For Ethernet packets, the maximum of seven
pages are used and the minimum is one.
Address look-up table consists of two spaces. One is a 16K entries of hash table and another is a 128
entries of CAM. The RTL8308/8306 uses address hashing algorithm or direct mapping method to search
destination MAC address and record source MAC address from and to the hash table. If hashed or
mapped location is not empty, the RTL8308/8306 will compare the destination MAC address with the
contents of the CAM for address searching and store source MAC address to CAM for learning.
www.DataSheet.co.kr
The RTL8308/8306 supports IEEE 802.3x full duplex flow control and half duplex back pressure
congestion control. The IEEE 802.3x flow control's ability is auto-negotiated between remote device and
the RTL8308/8306 by writing the flow control ability via MDIO to external connected PHY and restart
the auto-negotiation process. For half duplex, the RTL8308/8306 adopts a special back pressure design,
forwarding one packet successfully after 28 force collisions, to avoid the connected repeater being
partitioned due to lots of collisions. The full/half duplex flow control ability can be enable or disable via
ENFCTRL pin.
The RTL8308 provides reversible PHYAD order feature to connect diverse external PHY devices via
EEPROM's setting. But 8306 doesn't support this function.
The RTL8308/8306 is capable to auto-detect the network loop (or bridge loop). When a loop is detected,
the loop LED is displayed. This capability can be enabled or disabled via ENLOOP pin.
The RTL8308/8306 supports non-blocking 148800 packets/second wire speed forwarding rate and special
design to resolve the head-of-line-blocking problem.
The RTL8308/8306 can enable broadcast storm control via ENBRDCTRL pin. Each port will drop
2 99/10/26
Datasheet pdf - http://www.DataSheet4U.net/


Part Number RTL8308
Description (RTL8306 / RTL8308) 8/6-Port 10/100 Mbps Ethernet Switch Controller
Maker Realtek
Total Page 22 Pages
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