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參數(shù)資料
| 型號： | RTL8208 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | REALTEK SINGLE CHIP OCTAL 10/100 MBPS FAST ETHERNET TRANSCEIVER |
| 中文描述： | 瑞昱單芯片八路10/100 Mbps快速以太網(wǎng)收發(fā)器 |
| 文件頁數(shù)： | 25/40頁 |
| 文件大小： | 546K |
| 代理商： | RTL8208 |
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RTL8208
2001/01/07
25
Rev.1.923
7.6.1 RMII (Reduced MII)
The RTL8208 meets all of the RMII requirements outlined in the RMII Consortium specifications. The main advantage
introduced by RMII is pin count reduction; e.g., it operates with only one 50Mhz reference clock for both the TX and RX sides
without separate clocks needed for both paths, as with the MII interface. However, some hardware modification is needed for
this change, the most important and outstanding of which is the presence of an elastic buffer for absorption of the frequency
difference between the 50MHz reference clock and the clocking information of the incoming data stream. Another change
implemented is that the MII RXDV and Carrier_Sense are merged into one signal, CRS_DV, which is asserted high while
detecting incoming packet data. When internal Carrier_Sense de-asserted, CRS_DV is de-asserted when the first di-bit of a
nibble is presented onto RXD[1:0] synchronously to REFCLK. If there is still data in the FIFO that has not yet been presented
onto RXD[1:0], then on the second di-bit of a nibble CRS_DV reasserts. This pattern of assertion and de-assertion continues
until all received data in the FIFO has been presented onto RXD[1:0]
RTL8208
8-port
MAC
TX_EN[7:0]
TXD0[7:0]
TXD1[7:0]
CRS_DV[7:0]
RXD0[7:0]
RXD1[7:0]
50MHz
oscillator
REFCLK
RTL8208
8-port
MAC
TX_EN[7:0]
TXD0[7:0]
TXD1[7:0]
CRS_DV[7:0]
RXD0[7:0]
RXD1[7:0]
REFCLK
25MHz
X1
X2
X1
RMII Signal Diagram
50MHz Oscillator Solution
RMII Signal Diagram
25MHz Crystal Solution
7.6.2 SMII (Serial MII)
The RTL8208 also supports SMII interface to MAC, which allows a further reduction in the number of signals. As illustrated
below, both the MAC and RTL8208 are synchronous to a 125MHz reference clock.
8-port
MAC
RTL8208
SYNC
TXD0[7:0]
RXD0[7:0]
125MHz
oscillator
REFCLK
X1
SMII Signal Diagram
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| RTL8208C-GR | 制造商:Realtek Semiconductor 功能描述: |
| RTL8208電路圖-1 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:RTL8208電路圖-1,RTL8204 |
| RTL8211 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| RTL8211DG-VB-GR | 制造商:Realtek 功能描述:0 |
| RTL8211DN-VB-GR | 制造商:Realtek Semiconductor 功能描述: |
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