參數(shù)資料
型號(hào)： RTL8308B
廠商： Electronic Theatre Controls, Inc.
英文描述： REALTEK SINGLE CHIP 8-PORT 10/100 ETHERNET SWITCH CONTROLLER WITH EMBEDDED MEMORY
中文描述： 瑞昱單片8端口10/100以太網(wǎng)交換機(jī)控制器，嵌入式存儲(chǔ)器
文件頁(yè)數(shù)： 18/28頁(yè)
文件大?。?/td> 397K
代理商： RTL8308B
RTL8308B
2002/01/23
Rev. 2.0
18
6.19 Loop Detection
When the loop detection function is enabled, by setting Enloop in EEPROM, the RTL8308B periodically sends out
a broadcast 64-byte packet every 3~5 minutes and automatically detects the existence of a network loop (or bridge
loop). The loop LED asserted low indicates that a loop exits. The LED will go out by unplugging both of the
RTL8308B ports of the loop. The Loop frame length is 64 bytes and its format is below.
FFFFF80F
SID
0040 0000000…0000
CRC
In order to achieve loop detection, each switch device needs a different SID for detection. In addition, a different
EtherID is needed for each device when the loop detection function is enabled. If no EEPROM is used, the
RTL8308B uses a default SID (0180c2000001) and FCS.
6.20 Head-Of-Line Blocking
The RTL8308B incorporate a simple mechanism to prevent Head-Of-Line blocking problems when flow control is
disabled. When the flow control function is disabled, the RTL8308B will first check the destination address of the
incoming packet. If the destined port is congested, then the RTL8308B will discard this packet to avoid blocking
the next packet which is going to a non-congested port.
6.21 24LC02 Interface
The 24LC02 interface is a 2-wire serial EEPROM interface providing 2K bits of storage space. After a power on
reset, the RTL8308B uses Random Read and Sequential Read commands to auto-load configuration settings,
switch Ethernet ID, etc. After it is auto-loaded, the 24LC02 interface pins SCL and SDA are tri-stated for other
devices (e.g. PC parallel port or 8051 controller) to program the 24LC02 contents.
If a 24LC02 is not used, byte 0 of the 24LC02 would be read as FF. When byte 0 is not FF, the RTL8308B will
directly use the default value. The default values of byte 0 and byte 1 are 00. When the 24LC02 is not used, the
RTL8308B will also use default SID, FCS of Pause-On and Pause-off.
SCLK
SDA
SCLK
SDA
Programming
Device
RTL8308B
24LC02
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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RTL8309SB-LF 制造商:Realtek Semiconductor 功能描述:RTL8309 Series 9 Port 10/100 Mbps Ethernet Switch Controller - PQFP-128 制造商:Realtek 功能描述:RTL8309 Series 9 Port 10/100 Mbps Ethernet Switch Controller - PQFP-128
RTL8316 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Specifications
RTL8363S-GR 制造商:Realtek Semiconductor 功能描述:
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