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| 型號： | KS8993M |
| 廠商： | Micrel Inc |
| 文件頁數(shù)： | 27/85頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC SWITCH 10/100 3PORT 128PQFP |
| 標(biāo)準(zhǔn)包裝： | 66 |
| 系列： | * |
| 類型： | * |
| 應(yīng)用： | * |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 128-BFQFP |
| 供應(yīng)商設(shè)備封裝： | 128-PQFP（14x20） |
| 包裝： | 管件 |
| 配用： | 576-1013-ND - BOARD EVAL EXPERIMENT KS8993M |
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Micrel, Inc.
KS8993M/ML/MI
April 2005
33
M9999-041205
Registers are 8 data bits wide. For read operation, data bits [15:8] are read back as 0’s. For write
operation, data bits [15:8] are not defined, and hence can be set to either 0’s or 1’s.
SMI register access is the same as the MIIM register access, except for the register access requirements
presented in this section.
Advanced Switch Functions
Spanning Tree Support
To support spanning tree, port 3 is the designated port for the processor.
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 description shows the port setting and software actions taken for each of the five spanning tree states.
Disable state:
The port should not forward or receive any packets.
Learning is disabled.
Port setting:
“transmit enable = 0, receive enable = 0, learning disable =1”
Software action:
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. Note: processor is connected to port 3 via
MII interface. Address learning is disabled on the port in this state.
Blocking state:
Only packets to the processor are forwarded.
Learning is disabled.
Port setting:
“transmit enable = 0, receive enable = 0, learning disable =1”
Software action:
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 (e.g. 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:
Only packets to and from the processor are forwarded.
Learning is disabled.
Port setting:
“transmit enable = 0, receive enable = 0, learning disable =1”
Software action:
The processor should program the “Static MAC table” with the entries that it needs to receive
(e.g., 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 “Special Tagging Mode” for details. Address learning is disabled on the port in this state.
Learning state:
Only packets to and from the processor are forwarded.
Learning is enabled.
Port setting:
“transmit enable = 0, receive enable = 0, learning disable = 0”
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| KS8993M_11 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:Integrated 3-Port 10/100 Managed Switch with PHYs |
| KS8993MA5 | 功能描述:IC SWITCH 3-PORT 10/100 128-PQFP RoHS:否 類別:集成電路 (IC) >> 專用 IC 系列:* 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 類型:調(diào)幀器 應(yīng)用:數(shù)據(jù)傳輸 安裝類型:表面貼裝 封裝/外殼:400-BBGA 供應(yīng)商設(shè)備封裝:400-PBGA（27x27） 包裝:散裝 |
| KS8993M-EVAL | 功能描述:BOARD EVAL EXPERIMENT KS8993M RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 評估演示板和套件 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 主要目的:電源管理，電池充電器 嵌入式:否 已用 IC / 零件:MAX8903A 主要屬性:1 芯鋰離子電池 次要屬性:狀態(tài) LED 已供物品:板 |
| KS8993MI | 功能描述:IC SWITCH 10/100 3PORT 128PQFP RoHS:否 類別:集成電路 (IC) >> 專用 IC 系列:* 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 類型:調(diào)幀器 應(yīng)用:數(shù)據(jù)傳輸 安裝類型:表面貼裝 封裝/外殼:400-BBGA 供應(yīng)商設(shè)備封裝:400-PBGA（27x27） 包裝:散裝 |
| KS8993ML | 功能描述:IC SWITCH 10/100 3PORT 128PQFP RoHS:否 類別:集成電路 (IC) >> 專用 IC 系列:* 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 類型:調(diào)幀器 應(yīng)用:數(shù)據(jù)傳輸 安裝類型:表面貼裝 封裝/外殼:400-BBGA 供應(yīng)商設(shè)備封裝:400-PBGA（27x27） 包裝:散裝 |
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