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KSZ8873MLLJ Datasheet(PDF) 50 Page - Micrel Semiconductor |
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KSZ8873MLLJ Datasheet(HTML) 50 Page - Micrel Semiconductor |
50 / 108 page Micrel, Inc. KSZ8873MLLJ September 2011 50 M9999-091911-1.8 Register 3 (0x03): Global Control 1 Bit Name R/W Description Default 7 Pass All Frames R/W =1, Switch all packets including bad ones. Used solely for debugging purposes. Works in conjunction with sniffer mode only. 0 6 Port 3 Tail Tag Mode Enable R/W =1, Enable port 3 tail tag mode. =0, Disable. 0 5 IEEE 802.3x Transmit Direction Flow Control Enable R/W =1, Will enable transmit direction flow control feature. =0, Will not enable transmit direction flow control feature. Switch will not generate any flow control (PAUSE) frame. 1 4 IEEE 802.3x Receive Direction Flow Control Enable R/W =1, Will enable receive direction flow control feature. =0, Will not enable receive direction flow control feature. Switch will not react to any flow control (PAUSE) frame it receives. 1 3 Frame Length Field Check R/W =1, Will check frame length field in the IEEE packets. If the actual length does not match, the packet will be dropped (for Length/Type field < 1500). =0, Not check 0 2 Aging Enable R/W =1, Enable age function in the chip =0, Disable age function in the chip 1 1 Fast Age Enable R/W =1, Turn on fast age (800us) 0 0 Aggressive Back-off Enable R/W =1, Enable more aggressive back off algorithm in half duplex mode to enhance performance. This is not an IEEE standard. 0 Register 4 (0x04): Global Control 2 Bit Name R/W Description Default 7 Unicast Port-VLAN Mismatch Discard R/W This feature is used with port-VLAN (described in reg. 17, reg. 33, …) =1, All packets can not cross VLAN boundary =0, Unicast packets (excluding unkown/multicast/ broadcast) can cross VLAN boundary Note: Port mirroring is not supported if this bit is set to “0”. 1 6 Multicast Storm Protection Disable R/W =1, “Broadcast Storm Protection” does not include multicast packets. Only DA = FF-FF-FF-FF-FF-FF packets will be regulated. =0, “Broadcast Storm Protection” includes DA = FF-FF-FF- FF-FF-FF and DA[40] = 1 packets. 1 5 Back Pressure Mode R/W =1, Carrier sense based backpressure is selected =0, Collision based backpressure is selected 1 4 Flow Control and Back Pressure Fair Mode R/W =1, Fair mode is selected. In this mode, if a flow control port and a non-flow control port talk to the same destination port, packets from the non-flow control port may be dropped. This is to prevent the flow control port from being flow controlled for an extended period of time. =0, In this mode, if a flow control port and a non-flow control port talk to the same destination port, the flow control port will be flow controlled. This may not be “fair” to the flow control port. 1 3 No Excessive Collision Drop R/W =1, The switch will not drop packets when 16 or more collisions occur. =0, The switch will drop packets when 16 or more collisions occur. 0 |
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