参数资料
| 型号： | KS8001S |
| 厂商： | Micrel Inc |
| 文件页数： | 9/44页 |
| 文件大小： | 0K |
| 描述： | TXRX 10/100 LINKMD 3.3V 48-SSOP |
| 标准包装： | 30 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 1/1 |
| 规程： | IEEE 802 |
| 电源电压： | 1.8 V ~ 3.3 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-BSSOP（0.295"，7.50mm 宽） |
| 供应商设备封装： | 48-SSOP |
| 包装： | 管件 |
| 配用： | KS8001L-EVAL-ND - EVAL KIT EXPERIMENTAL KS8001L |
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KS8001
Micrel
May 2005 – SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
KS8001
MICREL CONFIDENTIAL. DO NOT DISTRIBUTE.
17
SMII Signal Definition
SMII is composed of two signals per port, a global synchronization signal, and a global 125MHz reference clock. All signals are
synchronous to the clock. All SMII I/F uses a common 125MHz reference clock and SYNC signals that are synchronous to the
reference clock. There are two signals in SMII from MAC-to-PHY for each port (TXD and TxSYNC), and one signal per port from
PHY-to-MAC (RXD).
The Serial Media Independent Interface (SMII) is designed to satisfy the following requirements:
Convey complete MII information between a 10/100 PHY and MAC with two pins per port.
Allow a multi-port MAC/PHY communication with one system clock.
Operate in both half and full duplex.
Per packet switching between 10Mbit and 100Mbit data rates.
Allow direct MAC to MAC communication.
SMII Signals
Signal Name
From
To
Use
RX
PHY
MAC
Receive Data and Control
TX
MAC
PHY
Transmit Data and Control
SYNC
MAC
PHY
Synchronization
Clock
System
MAC&PHY
Synchronization
Receive Path
Receive data and control information are signaled in ten bit segments. In 100Mbit mode, each segment represents a new byte of
data. In 10Mbit mode, each segment is repeated ten times; therefore, every ten segments represent a new byte of data. The MAC
can simply any one of every 10 segment ion 10Mbit mode.
Segment boundaries are delimited by SYNC. The MAC continuously generates a pulse on SYNC every 10 clocks.
Receive Sequence Diagram
CR S
R X _ D V
RX D0
R X D 1
RX D2
RX D3
RX D4
RX D5
R X D 6
RX D7
R X _C LK
RX _ S Y N C
RX
RX contains all of the information found on the receive path of the standard MII.
Bits
Purpose
CRS
Carrier Sense – identical to MII, except that it is not an asynchronous signal
RX_DV
Receive Data Valid – identical to MII
RXD7-0
Encoded Data, see the RXD0-7 Encoding table
RX – Bit Description
RXD7-0 are used to convey packet data, RX_ER, and PHY status. The MAC can infer the meaning of RXD on a segment-by-basis
by encoding the two control bits.
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