参数资料
型号: KSZ8842-PMBL AM
厂商: Micrel Inc
文件页数: 40/119页
文件大小: 0K
描述: IC ETHERNET SW 2PORT 100-LFBGA
标准包装: 260
控制器类型: 以太网开关控制器
接口: PCI
电源电压: 3.1 V ~ 3.5 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 100-LFBGA
供应商设备封装: 100-LFBGA
包装: 托盘
产品目录页面: 1081 (CN2011-ZH PDF)
配用: 576-1636-ND - BOARD EVALUATION KSZ8842-PMQL
其它名称: 576-3348
Micrel, Inc.
KSZ8842-PMQL/PMBL
October 2007
27
M9999-100207-1.5
Spanning Tree
Process
PTF1
IGMP Process
Port Mirror
Process
Port VLAN
Membership
Check
PTF2
- Check receiving port's receive enable bit
- Check destination port's transmit enable bit
- Check whether packets are special (BPDU)
or specified
- RX Mirror
- TX Mirror
- RX or TX Mirror
- RX and TX Mirror
- Applied to MAC #1 and MAC #2
- IGMP will be forwarded to the host port
Figure 8. Destination Address Resolution Flow Chart, Stage 2
The KSZ8842-PMQL/PMBL will not forward the following packets:
1.
Error packets.
These include framing errors, Frame Check Sequence (FCS) errors, alignment errors, and illegal size packet
errors.
2.
802.3x pause frames.
The KSZ8842-PMQL/PMBL intercepts these packets and performs flow control.
3.
"Local" packets.
Based on destination address (DA) lookup. If the destination port from the lookup table matches the port from
which the packet originated, the packet is defined as "local."
Switching Engine
The KSZ8842-PMQL/PMBL features a high-performance switching engine to move data to and from the MAC’s packet
buffers. It operates in store and forward mode, while the efficient switching mechanism reduces overall latency.
The switching engine has a 32KB internal frame buffer. This resource is shared between all the ports. There are a total
of 256 buffers available. Each buffer is sized at 128B.
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