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參數(shù)資料
| 型號： | KSZ8842-PMBL AM |
| 廠商： | Micrel Inc |
| 文件頁數(shù)： | 38/119頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ETHERNET SW 2PORT 100-LFBGA |
| 標準包裝： | 260 |
| 控制器類型： | 以太網(wǎng)開關控制器 |
| 接口： | PCI |
| 電源電壓： | 3.1 V ~ 3.5 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 100-LFBGA |
| 供應商設備封裝： | 100-LFBGA |
| 包裝： | 托盤 |
| 產品目錄頁面： | 1081 (CN2011-ZH PDF) |
| 配用： | 576-1636-ND - BOARD EVALUATION KSZ8842-PMQL |
| 其它名稱： | 576-3348 |
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Micrel, Inc.
KSZ8842-PMQL/PMBL
October 2007
25
M9999-100207-1.5
Usage
LinkMD can be used at any time by making sure Auto MDIX has been disabled. To disable Auto-MDIX, write a ‘1’ to
P1CR4[10] for port 1 or P2CR4[10] for port 2 to enable manual control over the pair used to transmit the LinkMD pulse.
The self-clearing cable diagnostic test enable bit, P1VCT[15] for port 1 or P2VCT[15] for port 2, is set to ‘1’ to start the
test on this pair.
When bit P1VCT[15] or P2VCT[15] returns to ‘0’, the test is complete. The test result is returned in bit P1VCT[14-13] or
P2VCT[14-13] and the distance is returned in bits P1VCT[8-0] or P2VCT[8-0]. The cable diagnostic test results are as
follows:
00 = Valid test, normal condition
01 = Valid test, open circuit in cable
10 = Valid test, short circuit in cable
11 = Invalid test, LinkMD failed
IIf P1VCT[14-13]=11 or P2VCT[14-13]=11, this indicates an invalid test, and occurs when the KSZ8842-PMQL/PMBL is
unable to shut down the link partner. In this instance, the test is not run, as it is not possible for the KSZ8842-
PMQL/PMBL to determine if the detected signal is a reflection of the signal generated or a signal from another source.
Cable distance (in meters) can be approximated by the following formula:
Distance = P1VCT[8-0] x 0.4m
This constant may be calibrated for different cabling conditions, including cables with a velocity of propagation that
varies significantly from the norm.
Functional Overview: MAC and Switch
Address Lookup
The internal lookup table stores MAC addresses and their associated information. It contains a 1K unicast address
table plus switching information.
The KSZ8842-PMQL/PMBL is guaranteed to learn 1K addresses and distinguishes itself from hash-based lookup
tables, which depending on the operating environment and probabilities, may not guarantee the absolute number of
addresses it can learn.
Learning
The internal lookup engine updates its table with a new entry if the following conditions are met:
1.
The received packet's Source Address (SA) does not exist in the lookup table.
2.
The received packet is good; the packet has no receiving errors, and is of legal length.
The lookup engine inserts the qualified SA into the table, along with the port number and time stamp. If the table is full,
the last entry of the table is deleted to make room for the new entry.
Migration
The internal lookup engine also monitors whether a station has moved. If a station has moved, it updates the table
accordingly. Migration happens when the following conditions are met:
1.
The received packet's SA is in the table but the associated source port information is different.
2.
The received packet is good; the packet has no receiving errors, and is of legal length.
The lookup engine updates the existing record in the table with the new source port information.
Aging
The lookup engine updates the time stamp information of a record whenever the corresponding SA appears. The time
stamp is used in the aging process. If a record is not updated for a period of time, the lookup engine removes the
record from the table. The lookup engine constantly performs the aging process and continuously removes aging
records. The aging period is about 200 seconds. This feature can be enabled or disabled through Global Register
SGCR1[10]).
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| KSZ8842-PMBL-EVAL | 功能描述:以太網(wǎng)開發(fā)工具 2+1 Port 10/100 Ethernet Switch with 32b/33MHz PCI Interface (BGA Version) Eval Board RoHS:否 制造商:Micrel 產品:Evaluation Boards 類型:Ethernet Transceivers 工具用于評估:KSZ8873RLL 接口類型:RMII 工作電源電壓: |
| KSZ8842-PMBL-TR | 功能描述:Ethernet Switch 10/100 Base-T/TX PHY PCI Interface 100-LFBGA (9x9) 制造商:microchip technology 系列:- 包裝:剪切帶（CT） 零件狀態(tài):停產 協(xié)議:以太網(wǎng) 功能:開關 接口:PCI 標準:10/100 Base-T/TX PHY 電壓 - 電源:3.1 V ~ 3.5 V 電流 - 電源:122mA 工作溫度:-40°C ~ 85°C 封裝/外殼:100-LFBGA 供應商器件封裝:100-LFBGA（9x9） 標準包裝:1 |
| KSZ8842-PMQL | 功能描述:以太網(wǎng) IC 2-Port Ethernet Switch/Repeater + 32-bit/33MHz PCI bus interface(Lead Free) RoHS:否 制造商:Micrel 產品: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 |
| KSZ8842-PMQL-EVAL | 功能描述:以太網(wǎng)開發(fā)工具 KSZ8842-PMQL Evaluation Board RoHS:否 制造商:Micrel 產品:Evaluation Boards 類型:Ethernet Transceivers 工具用于評估:KSZ8873RLL 接口類型:RMII 工作電源電壓: |
| KSZ8842-PMQLI | 功能描述:以太網(wǎng) IC 2-Port Ethernet Switch/Repeater + 32-bit/33MHz PCI bus interface, Ind Temp (Lead Free) RoHS:否 制造商:Micrel 產品: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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