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| 型號： | KSZ8873MLLJ |
| 廠商： | Micrel Inc |
| 文件頁數(shù)： | 36/108頁 |
| 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 |
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Micrel, Inc.
KSZ8873MLLJ
September 2011
33
M9999-091911-1.8
DiffServ-Based Priority
DiffServ-based priority uses the ToS registers (registers 96 to 111) in the Advanced Control Registers section. The ToS
priority control registers implement a fully decoded, 64-bit Differentiated Services Code Point (DSCP) register to
determine packet priority from the 6-bit ToS field in the IP header. When the most significant 6 bits of the ToS field are
fully decoded, the resultant of the 64 possibilities is compared with the corresponding bits in the DSCP register to
determine priority.
Spanning Tree Support
To support spanning tree, port 3 is designated as the processor port.
The other ports (port 1 and port 2) can be configured in one of the five spanning tree states via “transmit enable”, “receive
enable” and “l(fā)earning disable” register settings in registers 18 and 34 for ports 1 and 2, respectively. The following table
shows the port setting and software actions taken for each of the five spanning tree states.
Disable State
Port Setting
Software Action
The port should not forward or
receive any packets. Learning is
disabled.
“transmit
enable = 0,
receive
enable = 0,
learning
disable =1”
The processor should not send any packets to the port. The switch may still
send specific packets to the processor (packets that match some entries in
the “static MAC table” with “overriding bit” set) and the processor should
discard those packets. Address learning is disabled on the port in this
state.
Blocking State
Port Setting
Software Action
Only packets to the processor
are forwarded. Learning is
disabled.
“transmit
enable = 0,
receive
enable = 0,
learning
disable =1”
The processor should not send any packets to the port(s) in this state. The
processor should program the “Static MAC table” with the entries that it
needs to receive (for example, BPDU packets). The “overriding” bit should
also be set so that the switch will forward those specific packets to the
processor. Address learning is disabled on the port in this state.
Listening State
Port Setting
Software Action
Only packets to and from the
processor are forwarded.
Learning is disabled.
“transmit
enable = 0,
receive
enable = 0,
learning
disable =1”
The processor should program the “Static MAC table” with the entries that it
needs to receive (for example, BPDU packets). The “overriding” bit should
be set so that the switch will forward those specific packets to the
processor. The processor may send packets to the port(s) in this state. See
“Tail Tagging Mode” for details. Address learning is disabled on the port in
this state.
Learning State
Port Setting
Software Action
Only packets to and from the
processor are forwarded.
Learning is enabled.
“transmit
enable = 0,
receive
enable = 0,
learning
disable = 0”
The processor should program the “Static MAC table” with the entries that it
needs to receive (for example, BPDU packets). The “overriding” bit should
be set so that the switch will forward those specific packets to the
processor. The processor may send packets to the port(s) in this state. See
“Tail Tagging Mode” for details. Address learning is enabled on the port in
this state.
Forwarding State
Port Setting
Software Action
Packets are forwarded and
received normally. Learning is
enabled.
“transmit
enable = 1,
receive
enable = 1,
learning
disable = 0”
The processor programs the “Static MAC table” with the entries that it
needs to receive (for example, BPDU packets). The “overriding” bit is set so
that the switch forwards those specific packets to the processor. The
processor can send packets to the port(s) in this state. See “Tail Tagging
Mode” for details. Address learning is enabled on the port in this state.
Table 8. Spanning Tree States
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| KSZ8873MML | 功能描述:以太網(wǎng) IC 3-Port Fast Ethernet Switch with 2x MII Interface, Lead Free 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 |
| KSZ8873MML-EVAL | 功能描述:以太網(wǎng)開發(fā)工具 3-Port Fast Ethernet Switch with 2x MII Interface - Evaluation Board RoHS:否 制造商:Micrel 產(chǎn)品:Evaluation Boards 類型:Ethernet Transceivers 工具用于評估:KSZ8873RLL 接口類型:RMII 工作電源電壓: |
| 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 |
| KSZ8873RLL | 功能描述:以太網(wǎng) IC 3-Port Fast Ethernet Switch with 1x RMII Interface, Lead Free 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 |
| KSZ8873RLL-EVAL | 功能描述:以太網(wǎng)開發(fā)工具 3-Port Fast Ethernet Switch with 1x RMII Interface - Evalaution Board RoHS:否 制造商:Micrel 產(chǎn)品:Evaluation Boards 類型:Ethernet Transceivers 工具用于評估:KSZ8873RLL 接口類型:RMII 工作電源電壓: |
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