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参数资料
| 型号： | KSZ8721BL TR |
| 厂商： | Micrel Inc |
| 文件页数： | 5/35页 |
| 文件大小： | 0K |
| 描述： | IC TXRX PHY 10/100 3.3V 48LQFP |
| 标准包装： | 1 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 1/1 |
| 规程： | MII，RMII |
| 电源电压： | 3 V ~ 3.6 V |
| 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： | 标准包装 |
| 产品目录页面： | 1080 (CN2011-ZH PDF) |
| 配用： | 576-1627-ND - BOARD EVALUATION FOR KSZ8721BMC 576-1626-ND - BOARD EVALUATION FOR KSZ8721BL |
| 其它名称： | 576-1028-6 |
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Micrel, Inc.
KS8721BL/SL
June 2009
13
M9999-062509-1.3
receive clock is recovered from the line while carrier is active, and operates from the master input clock when the line is
idle. The KS8721BL/SL synchronizes the receive data and control signals on the falling edge of RXC in order to
stabilize the signals at the rising edge of the clock with 10ns setup and hold times.
Transmit Enable
The MAC must assert TXEN at the same time as the rst nibble of the preamble, and de-assert TXEN after the last bit
of the packet.
Receive Data Valid
The KS8721BL/SL asserts RXDV when it receives a valid packet. Line operating speed and MII mode will determine
timing changes in the following way:
For 100BASE-TX links with the MII in 4B mode, RXDV is asserted from the rst nibble of the preamble to the
last nibble of the data packet.
For 10BASE-T links, the entire preamble is truncated. RXDV is asserted with the rst nibble of the SFD “5D”
and remains asserted until the end of the packet.
Error Signals
Whenever the KS8721BL/SL receives an error symbol from the network, it asserts RXER and drives “1110” (4B) on the
RXD pins. When the MAC asserts TXER, the KS8721BL/SL will drive “H” symbols (a Transmit Error dened in the IEEE
802.3 4B/5B code group) out on the line to force signaling errors.
Carrier Sense (CRS)
For 100BASE-TX links, a start-of-stream delimiter, or /J/K symbol pair causes assertion of Carrier Sense (CRS). An
end-of-stream delimiter, or /T/R symbol pair, causes de-assertion of CRS. The PMA layer will also de-assert CRS if
IDLE symbols are received without /T/R, yet in this case RXER will be asserted for one clock cycle when CRS is de-
asserted. For 10BASE-T links, CRS assertion is based on reception of valid preamble, and de-assertion on reception of
an end-of-frame (EOF) marker.
Collision
Whenever the line state is half-duplex and the transmitter and receiver are active at the same time, the KS8721BL/SL
asserts its collision signal, which is asynchronous to any clock.
RMII (Reduced MII) Data Interface
RMII interface species a low-pin count, Reduced Media Independent Interface (RMII) intended for use between
Ethernet PHYs and Switch or Repeater ASICs. It is fully compliant with IEEE 802.3u [2].
This interface has the following characteristics:
It is capable of supporting 10Mbps and 100Mbps data rates.
A single clock reference is sourced from the MAC to PHY (or from an external source).
It provides independent 2-bit wide (di-bit) transmit and receive data paths.
It uses TTL signal levels compatible with common digital CMOS ASIC processes.
RMII Signal Denition
Signal Name
Direction
(w/respect to the PHY)
Direction
(w/respect to the MAC)
Use
REF_CLK
Input
Input or Output
Synchronous clock reference for receive, transmit and
control interface
CRS_DV
Output
Input
Carrier Sense/Receive Data Valid
RXD[1:0]
Output
Input
Receive Data
TX_EN
Input
Output
Transmit Enable
TXD[1:0]
Input
Output
Transmit Data
RX_ER
Output
Input (Not Required)
Receive Error
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相关代理商/技术参数 |
参数描述 |
|---|---|
| KSZ8721BMC-EVAL | 功能描述:以太网开发工具 KSZ8721BMC 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: |
| KSZ8721BT | 功能描述:以太网 IC 10/100 Base-TX/FX Physical Layer Transceiver, Single 3.3V Supply, 48-TQFP (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 |
| KSZ8721BTA4 | 功能描述:TXRX 10/100 3.3V 48-TQFP RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:1,140 系列:AU 类型:收发器 驱动器/接收器数:1/1 规程:CAN 电源电压:5.3 V ~ 27 V 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SO 包装:管件 其它名称:935267940512AU5790D14AU5790D14-ND |
| KSZ8721BT-EVAL | 功能描述:以太网开发工具 KSZ8721BT 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: |
| KSZ8721BTR | 制造商:Micrel 功能描述:Physical Layer Transceiver 1Ch 100Mbps |
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