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| 型号： | KSZ8842-PMBL AM |
| 厂商： | Micrel Inc |
| 文件页数： | 47/119页 |
| 文件大小： | 0K |
| 描述： | IC ETHERNET SW 2PORT 100-LFBGA |
| 标准包装： | 260 |
| 控制器类型： | 以太网开关控制器 |
| 接口： | PCI |
| 电源电压： | 3.1 V ~ 3.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 100-LFBGA |
| 供应商设备封装： | 100-LFBGA |
| 包装： | 托盘 |
| 产品目录页面： | 1081 (CN2011-ZH PDF) |
| 配用： | 576-1636-ND - BOARD EVALUATION KSZ8842-PMQL |
| 其它名称： | 576-3348 |
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Micrel, Inc.
KSZ8842-PMQL/PMBL
October 2007
33
M9999-100207-1.5
For ingress rate limiting, KSZ8842-PMQL/PMBL provides options to selectively choose frames from all types, multicast,
broadcast, and flooded unicast frames. The KSZ8842-PMQL/PMBL counts the data rate from those selected type of
frames. Packets are dropped at the ingress port when the data rate exceeds the specified rate limit.
For egress rate limiting, the Leaky Bucket algorithm is applied to each output priority queue for shaping output traffic.
Inter frame gap is stretched on a per frame base to generate smooth, non-bursty egress traffic. The throughput of each
output priority queue is limited by the egress rate specified.
If any egress queue receives more traffic than the specified egress rate throughput, packets may be accumulated in the
output queue and packet memory. After the memory of the queue or the port is used up, packet dropping or flow control
will be triggered. As a result of congestion, the actual egress rate may be dominated by flow control/dropping at the
ingress end, and may be therefore slightly less than the specified egress rate.
To reduce congestion, it is a good practice to make sure the egress bandwidth exceeds the ingress bandwidth.
MAC Filtering Function
Use the static table to assign a dedicated MAC address to a specific port. When a unicast MAC address is not recorded
in the static table, it is also not learned in the dynamic MAC table. The KSZ8842-PMQL/PMBL includes an option that
can filter or forward unicast packets for an unknown MAC address. This option is enabled by SGCR7[7].
The unicast MAC address filtering function is useful in preventing the broadcast of unicast packets that could degrade
the quality of this port in applications such as voice over Internet Protocol (VoIP).
Configuration Interface
The KSZ8842-PMQL/PMBL operates as a managed switch or a repeater, however it cannot be used as an unmanaged
switch.
EEPROM Interface
The external serial EEPROM with a standard microwire bus interface is used for non-volatile storage of information
such as the host MAC address and ID, (for example, 93C46 or 93C66 EEPROM devices.)
If the EEEN pin/ball is pulled high, the KSZ8842-PMQL/PMBL performs an automatic read of the external EEPROM
words 0H to 6H after the de-assertion of Reset. The EEPROM values are placed in certain host-accessible registers.
EEPROM read/write functions can also be performed by software read/writes to the EEPCR registers.
The KSZ8842-PMQL/PMBL EEPROM format is given below.
WORD
15
8
7
0
0H
Reserved
1H
Host MAC Address Byte 2
Host MAC Address Byte 1
2H
Host MAC Address Byte 4
Host MAC Address Byte 3
3H
Host MAC Address Byte 6
Host MAC Address Byte 5
4H
Subsystem ID
5H
Subsystem Vendor ID
6H
Reserved
7H-3FH
Not used by KSZ8842-PMQL/PMBL (available for user to use)
Table 7. EEPROM Format
Loop back Support
The KSZ8842-PMQL/PMBL provides loop back support for remote diagnostic of failure. In loop back mode, the speed
at both PHY ports will be set to 100BASE-TX full-duplex mode. Two types of loop back are supported: Far-end Loop
back and Near-end (Remote) Loop back.
Far-end Loop back:
Far-end loop back is conducted between the KSZ8842-PMQL/PMBL’s two PHY ports. The loop back path starts at the
“Originating” PHY. The originating PHY port’s receive inputs (RXP/RXM), wrap around at the “loop back” PHY port’s
PMD/PMA, and ends at the “Originating” PHY port’s transmit outputs (TXP/TXM).
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| KSZ8842-PMBL-EVAL | 功能描述:以太网开发工具 2+1 Port 10/100 Ethernet Switch with 32b/33MHz PCI Interface (BGA Version) Eval Board RoHS:否 制造商:Micrel 产品:Evaluation Boards 类型:Ethernet Transceivers 工具用于评估:KSZ8873RLL 接口类型:RMII 工作电源电压: |
| 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:- 包装:剪切带（CT） 零件状态:停产 协议:以太网 功能:开关 接口:PCI 标准:10/100 Base-T/TX PHY 电压 - 电源:3.1 V ~ 3.5 V 电流 - 电源:122mA 工作温度:-40°C ~ 85°C 封装/外壳:100-LFBGA 供应商器件封装:100-LFBGA（9x9） 标准包装:1 |
| KSZ8842-PMQL | 功能描述:以太网 IC 2-Port Ethernet Switch/Repeater + 32-bit/33MHz PCI bus interface(Lead Free) RoHS:否 制造商:Micrel 产品:Ethernet Switches 收发器数量:2 数据速率:10 Mb/s, 100 Mb/s 电源电压-最大:1.25 V, 3.45 V 电源电压-最小:1.15 V, 3.15 V 最大工作温度:+ 85 C 封装 / 箱体:QFN-64 封装:Tray |
| KSZ8842-PMQL-EVAL | 功能描述:以太网开发工具 KSZ8842-PMQL Evaluation Board RoHS:否 制造商:Micrel 产品:Evaluation Boards 类型:Ethernet Transceivers 工具用于评估:KSZ8873RLL 接口类型:RMII 工作电源电压: |
| KSZ8842-PMQLI | 功能描述:以太网 IC 2-Port Ethernet Switch/Repeater + 32-bit/33MHz PCI bus interface, Ind Temp (Lead Free) RoHS:否 制造商:Micrel 产品:Ethernet Switches 收发器数量:2 数据速率:10 Mb/s, 100 Mb/s 电源电压-最大:1.25 V, 3.45 V 电源电压-最小:1.15 V, 3.15 V 最大工作温度:+ 85 C 封装 / 箱体:QFN-64 封装:Tray |
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