參數(shù)資料
型號: E-1110
英文描述: E-1110 10/100/1000 Mbits/s Ethernet MAC preliminary technical manual 4/01
中文描述: 電子1110 10/100/1000 Mbits /秒以太網(wǎng)MAC初步的技術(shù)手冊4 / 01
文件頁數(shù): 30/108頁
文件大?。?/td> 577K
代理商: E-1110
2-18
Functional Description
2.1.5 Physical Interface Multiplexer
The Physical Interface Multiplexer (PHY MUX) multiplexes the PHY
interface signals and provides a unied overlapped set of signals that
assumes different meaning depending on the mode of operation (GMII,
MII, or TBI). The purpose for multiplexing the MII, GMII and TBI signals
into a single overlapped set of signals is:
To reduce the number of I/O pins
To close the timing constraints and meet all of the stringent timing
requirements for modes such as GMII
Provide a single set of pins that can assume any interface based on
the conguration of a few control signals.
2.1.5.1 MII Mode
The MII mode is used when the E-110 core needs to communicate with
an MII-compatible external PHY. Figure 2.2 is a diagram of the signal
ow through the PHY multiplexer mapping when it is operating in the MII
mode.
Figure 2.2
PHY Multiplexer Signal Mapping in MII Mode
In MII Mode, the E-110 MII_TXD[3:0], MII_TXEN, and MII_TXER signals
are mapped to the PHY E1110_TXD[3:0], E1110_TXD[8], and
E1110_TXD[9] pins, respectively. The E1110_MII_TCLK transmit clock
and the E1110_PHY_RCLK are each separate input pins on the E-1110
core. Similarly, the PHY E1110_RXD[3:0], E1110_RXD[8],
MII_TXD[3:0]
MII_TXEN
MII_TXER
MII_TCLK
MII_RCLK
MII_RXD[3:0]
MII_RXDV
MII_RXER
MII_COL
MII_CRS
E1110_TXD[3:0]
E1110_TXD[8]
E1110_TXD[9]
E1110_MII_TCLK
E1110_PHY_RCLK
E1110_RXD[3:0]
E1110_RXD[9]
E1110_COL
E1110_CRS
E1110_RXD[8]
To
E-110
To
PHY
PHY Mux
(MII Mode)
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