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參數(shù)資料
| 型號(hào)： | RTL8305SB |
| 英文描述： | RTL8305SB |
| 中文描述： | RTL8305SB |
| 文件頁(yè)數(shù)： | 49/66頁(yè) |
| 文件大?。?/td> | 963K |
| 代理商： | RTL8305SB |
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RTL8305SB
2002/04/09
49
Rev.1.0
7.3.14 MAC Loopback return to External
Each port supports loopback of the MAC (return to external device) function for diagnostic purposes. For example: If the
internal register DisP4LoopBack=0, the RTL8305SB will “forward local and broadcast packets from the input of Port4 to
output of Port4” and “drop unicast packets from the input of Port4”. The other port still can forward broadcast or unicast
packets to port4. Example2: If the internal register DisP3LoopBack=0, the RTL8305SB will “forward local and broadcast
packets from the input of Port3 to output of Port3” and “drop unicast packets from input of Port3”. The other port still can
forward broadcast or unicast packets to port3.
This is especially useful for router applications to perform mass production tests. This function does nothing with PHY type
(GxMode/GyMode/P4Mode[1:0]) and can be done on each mode. Below are two examples: In Example 1, the external device
(CPU) is connected to MII or SNI interface of Port4. In Example 2, the external device (CPU) does not have an MII or SNI
interface, so it can use the PCI interface to connect RTL8139 to the UTP of Port4.
8305SB
CPU
MII/SNI
Example 1: LoopBack in external PHY
8305SB
CPU
UTP
Example 2: LoopBack in UTP
8139
PCI
Figure 3: Port4 Loopback
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相關(guān)代理商/技術(shù)參數(shù) |
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| RTL8305SC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:用于100M網(wǎng)絡(luò)交換 |
| RTL8305SC-LF | 制造商:Realtek Semiconductor 功能描述: |
| RTL8308B | 制造商:Realtek Semiconductor 功能描述:8-PORT 10/100 ETHERNET SWITCH CONTROLLER WITH EMBEDDED MEMORY, PQFP128 |
| RTL8309SB | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:SINGLE-CHIP 9-PORT 10/100MBPS SWITCH CONTROLLER |
| 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 |
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