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参数资料
| 型号： | KSZ8851-16MLLI |
| 厂商： | Micrel Inc |
| 文件页数： | 15/84页 |
| 文件大小： | 0K |
| 描述： | IC MAC CTLR 1PORT W/BUS 48-TQFP |
| 标准包装： | 250 |
| 控制器类型： | 以太网控制器，MAC/PHY |
| 接口： | 总线 |
| 电源电压： | 1.8V，2.5V，3.3V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-LQFP |
| 供应商设备封装： | 48-LQFP（7x7） |
| 包装： | 托盘 |
| 产品目录页面： | 1081 (CN2011-ZH PDF) |
| 其它名称： | 576-3505 |
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Micrel, Inc.
KSZ8851-16MLL/MLLI
March 11, 2014
22
Revision 2.2
On the transmit side, the KSZ8851-16MLL has intelligent and efficient ways to determine when to invoke flow control. The
flow control is based on availability of the system resources.
There are three programmable low watermark register FCLWR (0xB0), high watermark register FCHWR (0xB2) and
overrun watermark register FCOWR (0xB4) for flow control in RXQ FIFO. The KSZ8851-16MLL will send PAUSE frame
when the RXQ buffer hit the high watermark level (default 3.072KByte available) and stop PAUSE frame when the RXQ
buffer hit the low watermark level (default 5.12KByte available). The KSZ8851-16MLL will drop packet when the RXQ
buffer hit the overrun watermark level (default 256-Byte available).
The KSZ8851-16MLL issues a flow control frame (Xoff, or transmitter off), containing the maximum pause time defined in
IEEE standard 802.3x. Once the resource is freed up, the KSZ8851-16MLL sends out the another flow control frame
(Xon, or transmitter on) with zero pause time to turn off the flow control (turn on transmission to the port). A hysteresis
feature is provided to prevent the flow control mechanism from being constantly activated and deactivated.
Half-Duplex Backpressure
A half-duplex backpressure option (non-IEEE 802.3 standards) is also provided. The activation and deactivation
conditions are the same as in full-duplex mode. If backpressure is required, the KSZ8851-16MLL sends preambles to
defer the other stations' transmission (carrier sense deference).
To avoid jabber and excessive deference (as defined in the 802.3 standard), after a certain time, the KSZ8851-16MLL
discontinues the carrier sense backpressure and then raises it again quickly. This short silent time (no carrier sense)
prevents other stations from sending out packets thus keeping other stations in a carrier sense deferred state. The short
silent time is about 4us and repeat every 1.64ms in the backpressure jam patter for 10Base-T. If the port has packets to
send during a backpressure situation, the carrier sense type backpressure is interrupted and those packets are
transmitted instead. If there are no additional packets to send, carrier sense type backpressure is reactivated again until
chip resources free up. If a collision occurs, the binary exponential back-off algorithm is skipped and carrier sense is
generated immediately, thus reducing the chance of further collision and carrier sense is maintained to prevent packet
reception.
Address Filtering Function
The KSZ8851-16MLL supports 11 different address filtering schemes as shown in the following Table 3. The Ethernet
destination address (DA) field inside the packet is the first 6-byte field which uses to compare with either the host MAC
address registers (0x10 – 0x15) or the MAC address hash table registers (0xA0 – 0xA7) for address filtering operation.
The first bit (bit 40) of the destination address (DA) in the Ethernet packet decides whether this is a physical address if bit
40 is “0” or a multicast address if bit 40 is “1”.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| KSZ8851-16MLLI TR | 功能描述:以太网 IC 10/100BT Ethernet MAC + PHY with Generic (8, 16-bit) Bus Interface (I-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 |
| KSZ8851-16MLLJ | 功能描述:以太网 IC Single-Port Ethernet MAC Controller with 8/16-Bit Non-PCI Interface (125C support) 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 |
| KSZ8851-16MLLJ_10 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:Single-Port Ethernet MAC Controller with 8-Bit or 16-Bit Non-PCI Interface |
| KSZ8851-16MLLU | 功能描述:以太网 IC Single-Port Ethernet Controller (Automotive Grade) 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 |
| KSZ8851-16MLLU TR | 功能描述:以太网 IC Single-Port Ethernet Controller (Automotive Grade) 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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