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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)交換機控制器，嵌入式存儲器 |
| 文件頁數(shù)： | 17/28頁 |
| 文件大?。?/td> | 397K |
| 代理商： | RTL8308B |
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RTL8308B
2002/01/23
Rev. 2.0
17
6.16 Flow Control
The RTL8308B supports IEEE 802.3x full duplex flow control and half duplex back pressure congestion control.
The IEEE 802.3x flow control ability is auto-negotiated between a remote device and the RTL8308B by writing
the flow control ability via MDIO to the external, connected PHY. The RTL8308B adopts a special half duplex
back pressure design, forwarding one packet successfully after 28 force collisions to prevent the connected repeater
from being partitioned due to excessive collisions. The full duplex flow control ability can be enabled or disabled
via the ENFCTRL pin, and the half duplex back pressure function can be enabled or disabled via the ENBKPRS
pin, both during hardware reset.
If ENFCTRL is set and the 802.3x pause ability from the auto-negotiation result is enabled, the full duplex 802.3x
flow control function is enabled. Otherwise, the full duplex 802.3x flow control function is disabled. When 802.3x
flow control is enabled, the RTL8308B will only recognize the 802.3x flow control PAUSE ON/OFF frames with
DA="0180C2000001", type="8808", OP-code="01", PAUSE Time = maximum or zero, and with good CRC.
If a PAUSE frame is received from any PAUSE flow control enabled port with DA=0180C2000001, the
corresponding port of the RTL8308B will stop its packet transmission until a PAUSE timer timeout or another
PAUSE frame with zero PAUSE time is received. No 802.3x PAUSE frames received from any port will be
forwarded by the RTL8308B.
6.17 Cut Through
The RTL8308B can operate in cut-through or store-and-forward mode. When in cut through mode (by pulling the
ENCUTHR pin high), if receiving packet length is greater than 512 bytes, the RTL8308B starts to forward it after
512 bytes are received. If less than 512 bytes, the RTL8308B operates as same as store-and-forward mode.
6.18 Broadcast Storm Filtering Control
The RTL8308B can enable broadcast storm filtering control by pulling high EnBrdCtrl (pin108). This allows
limitation of the number of broadcast packets into the switch, and can be implemented on a per port basis. The
threshold of number of broadcast packets is set to 64. When enabled, each port will drop broadcast packets
(Destination MAC ID is ff ff ff ff ff ff) after receiving 64 continuous broadcast packets. The counter will be reset to
0 every 800ms or when receiving any non-broadcast packets (Destination MAC ID is not ff ff ff ff ff ff).
When disabled, or the number of non-unicast packets received at the port is not over the programmed threshold, the
RTL8308B will forward the packet to all the ports (except the receiving port) within the VLANs specified at the
receiving port. If the CPU port is within the specified VLAN, the packet will also be forwarded to the CPU.
If Broadcast-Storm-drop (BConly_SC) is enabled, the RTL8308B will only drop broadcast packets but not the
multicast packets.
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