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參數(shù)資料
| 型號： | 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，嵌入式存儲器 |
| 文件頁數(shù)： | 13/28頁 |
| 文件大小： | 397K |
| 代理商： | RTL8308B |
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RTL8308B
2002/01/23
Rev. 2.0
13
The Management frame format is listed below:
PRE
ST
READ
1…1
01
WRITE
1…1
01
6.5 Reversible PHYAD Order
Management frame fields
PHYAD
REGAD
AAAAA
RRRRR
AAAAA
RRRRR
IDLE
Z
Z
OP
10
01
TA
Z0
10
DATA
DDDDDDDDDDDDDDDD
DDDDDDDDDDDDDDDD
In order to maintain maximum flexibility, the RTL8308B provides a reversible PHYAD order feature. This allows
reverse ordering of the PHY addresses, which allows connection of the RTL8308B to diverse external PHY
devices. The addresses of ports [A] to [H] correspond to PHYAD 01000b to 01111b, or to PHYAD 01111b to
01000b, depending on the value of PHYAD_RV in the EEPROM.
6.6 Address Search and Learning
The address look-up table consists of an 8K entry hash table and a 128 entry CAM. The RTL8308B uses the hashing
algorithm or direct mapping method to search destination MAC addresses from and record source MAC address to
the table. If a hashed or mapped location is not empty, the RTL8308B will compare the destination MAC address with
the contents of the CAM for address searching and store source MAC address to CAM for learning.
The aging time of the MAC address is 300 seconds. The address hashing or direct mapping algorithm can be
selected via the 24LC02. A port’s MAC address register is cleared on power-up, or hardware reset. If the SA aging
option is enabled, the dynamically learned SA will be cleared if it is not refreshed in less than programmed time.
The table lookup engine provides the switching information required for routing the data packets. The address look
up table is set up through auto address learning (dynamic) or manual entry (static). The static addresses are
assigned to the address table by the EEPROM or management device. All static address entries will not be aged or
updated by the RTL8308B.
After a frame is received by RTL8308B, the embedded source address (SA) and destination addresses (DA) are
retrieved. The source address retrieved from the received frame is automatically stored in a SA buffer. The
RTL8308B will then check for error and security violation, and perform a SA search. If there is no error or security
violation, the chip will store the source address in the address lookup table. If the SA has been previously stored in
another port’s SA table, the RTL8308B will delete the SA from the previously stored location.
The Individual MAC Address is a 48-bit unique MAC address to be programmed or learned. Bit 0 of a SA will be
masked, i.e. no multicast SA.
The RTL8308B provides an on-chip MACAddress-To-PortID/TrunkID table with up to 1K entries for packet
destination look-up operation.
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| RU4D | SDR Cable Assembly; Connector Type A:micro D Ribbon Plug; Connector Type B:micro D Ribbon Plug; Cable Length:2m; No. of Contacts:26; Pitch Spacing:0.8mm RoHS Compliant: Yes |
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相關(guān)代理商/技術(shù)參數(shù) |
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| 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 |
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| RTL8316 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Specifications |
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