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| 型号： | GT-48006A |
| 厂商： | Galileo Technology Services, LLC |
| 英文描述： | Low Cost Two Port 10/100Mbps Ethernet Bridge/Switch Controller(低成本、双端口10/100Mbps以太网桥式/交换式控制器) |
| 中文描述： | 低成本双口10/100Mbps以太网桥/开关控制器（低成本，双端口10/100以太网桥式/交换式控制器） |
| 文件页数： | 5/33页 |
| 文件大小： | 352K |
| 代理商： | GT-48006A |
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GT-48006A Low Cost Two Port 10/100 Ethernet Bridge/Switch Controller
13
8.
Packet Forwarding
The following sections describe the procedures for forwarding packets in the following situations:
A unicast packet
A multicast packet
8.1
Forwarding a Unicast Packet Across the Bridge
The sequence for forwarding a unicast packet across the bridge is as follows:
1.
The incoming packet is fed to the Rx FIFO (there is an 20x32-bit Rx FIFO per port) and is transferred to an empty
block in the Receive Buffer area of DRAM.
2.
In parallel, an address recognition cycle is performed for both the DA and the SA. The GT-48006A uses the DA’s
corresponding Port Number to queue the packet to the other port, or to drop the packet if the destination port
equals the source port.
3.
At the end of an error-free packet transfer, packet information is written to the output port’s transmit descriptor. This
information includes the Byte Count and the Receive Buffer Block Address which is pointed to by the Write Pointer.
4.
The Write Pointer of the outgoing port’s transmit descriptor is incremented. The target device transmits whenever
the Write Pointer is not equal to the Read Pointer.
5.
At the end of the packet transmit process, the target device increments the Read Pointer and clears the appropri-
ate bit in the Empty List.
8.2
Forwarding a Multicast Packet
The GT-48006A forwards Multicast packets across the bridge using the same mechanism as described for Unicast
packets. Multicast and Broadcast packets are not re-sent on the input port.
8.3
Tx Watchdog Timer
The GT-48006A includes a transmit watchdog timer for each transmit queue. For 100Mbps operation, the value of the
timer is 63msec. For 10Mbps operation, the default value of the timer is 630msec. The timer measures the time
between the transmission of two consecutive outgoing packets. When the timer expires, the GT-48006A clears the
appropriate used blocks.
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