參數(shù)資料
型號(hào)： KSZ8873MLLJ
廠商： Micrel Inc
文件頁(yè)數(shù)： 38/108頁(yè)
文件大?。?/td> 0K
描述： IC ETHERNET SWITCH 3PORT 64LQFP
特色產(chǎn)品： KSZ8873MLLJ Ethernet Switches
標(biāo)準(zhǔn)包裝： 160
系列： *
其它名稱： 576-3996
Micrel, Inc.
KSZ8873MLLJ
September 2011
35
M9999-091911-1.8
Ingress to Port 3 (Host -> KSZ8873MLLJ)
Bit [1,0]
Destination Port
0,0
Normal (Address Look up)
0,1
Port 1
1,0
Port 2
1,1
Port 1 and 2
Bit [3,2]
Frame Priority
0,0
Priority 0
0,1
Priority 1
1,0
Priority 2
1,1
Priority 3
Egress from Port 3 (KSZ8873MLLJ->Host)
Bit [0]
Source Port
0
Port 1
1
Port 2
Figure 8. Tail Tag Rules
IGMP Support
For Internet Group Management Protocol (IGMP) support in layer 2, the KSZ8873MLLJ provides two components:
IGMP Snooping
The KSZ8873MLLJ traps IGMP packets and forwards them only to the processor (port 3). The IGMP packets are
identified as IP packets (either Ethernet IP packets, or IEEE 802.3 SNAP IP packets) with IP version = 0x4 and protocol
version number = 0x2.
IGMP Send Back to the Subscribed Port
Once the host responds the received IGMP packet, the host should knows the original IGMP ingress port and send back
the IGMP packet to this port only, otherwise this IGMP packet will be broadcasted to all port to downgrade the
performance.
Enable the tail tag mode, the host will know the IGMP packet received port from tail tag bits [0] and can send back the
response IGMP packet to this subscribed port by setting the bits [1,0] in the tail tag. Enable “Tail tag mode” by setting
Register 3 bit 6. The tail tag will be removed automatically when the IGMP packet is sent out from the subscribed port.
Port Mirroring Support
KSZ8873MLLJ supports “Port Mirroring” comprehensively as:
“receive only” mirror on a port
All the packets received on the port are mirrored on the sniffer port. For example, port 1 is programmed to be
“receive sniff” and port 3 is programmed to be the “sniffer port”. A packet received on port 1 is destined to port 2
after the internal lookup. The KSZ8873MLLJ forwards the packet to both port 2 and port 3. The KSZ8873MLLJ
can optionally even forward “bad” received packets to the “sniffer port”.
“transmit only” mirror on a port
All the packets transmitted on the port are mirrored on the sniffer port. For example, port 1 is programmed to be
“transmit sniff” and port 3 is programmed to be the “sniffer port”. A packet received on port 2 is destined to port 1
after the internal lookup. The KSZ8873MLLJ forwards the packet to both port 1 and port 3.
“receive and transmit” mirror on two ports
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KSZ8873MMLI 功能描述:以太網(wǎng) IC 3-Port Fast Ethernet Switch with 2x MII Interface (Industrial Grade) RoHS:否 制造商:Micrel 產(chǎn)品:Ethernet Switches 收發(fā)器數(shù)量:2 數(shù)據(jù)速率:10 Mb/s, 100 Mb/s 電源電壓-最大:1.25 V, 3.45 V 電源電壓-最小:1.15 V, 3.15 V 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-64 封裝:Tray
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