參數(shù)資料
型號： MDS212CG
廠商： ZARLINK SEMICONDUCTOR INC
元件分類： 網(wǎng)絡接口
英文描述： 12-Port 10/100Mbps Ethernet Switch
中文描述： DATACOM, LAN SWITCHING CIRCUIT, PBGA456
封裝： 35 X 35 MM, 2.33 MM HEIGHT, MS-034, HSBGA-456
文件頁數(shù)： 39/111頁
文件大小： 1609K
代理商： MDS212CG
MDS212
Data Sheet
39
Zarlink Semiconductor Inc.
Figure 9 - Basic Timing Diagram of XPipe
9.0 Physical Layer (Phy) Interface
The Physical Layer Interface is designed to interface Zarlink Semiconductor chipsets to a variety of Physical Layer
devices. Reduced Media Independent Interface (RMII) is used for 10/100 interfaces. The chip ball names for the
MAC use M as the first letter of the name, followed by their pin number, and then their function. M1_RXD0 refers to
Mac port 1, receive data 0, of the receive data pair.
9.1 Reduced MII (RMII)
The MDS212 implements the Reduced Media Independent Interface (RMII) signals, REF_CLK, CRS_DV, RXD
[1:0], TX_EN, and TXD [1:0], defined in Section 5 of the RMII Consortium Specification. The purpose of this
interface is to provide a low cost alternative to the IEEE 802.3u [2] MII interface. Under IEEE 802.3u [2], an MII
comprised of 16 pins for data and control is defined. In devices incorporating many MACs or PHY interfaces such
as switches, the number of pins can add significant cost as the port counts increase. The MDS212 offer 12 or 24
ports, in one or two devices respectively. At 6 pins per port and 1 pin per switch ASIC, the RMII specification saves
119 pins plus the extra power and ground pins to support those additional pins for a 12 port switch ASIC.
Architecturally, the RMII specification provides for an additional reconciliation layer on either side of the MII but can
be implemented in the absence of an MII. The management interface (MDIO/MDC) is assumed to be identical to
that defined in IEEE 802.3u [2].
The RMII supports both 10 and 100Mbps data rates across a two bit Transmit Data (TXD) path and a two bit
Receive Data (RXD) path.
The RMII uses a single synchronous clock reference sourced from the Media Access Controller (MAC), or an
external clock source, to the Physical Layer (PHY). Doubling the clock frequency to 50 MHz allows a reduction of
required data and control signals, thereby providing a low cost alternative to the IEEE Std 802.3u Media
Independent Interface (MII). The RMII functions to make the differences between copper and optical PHYs
transparent to the MAC sublayer.
The RMII specification 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).
X_CLKI/O
X_DENI/O
X_DI/O[31:0]
Cycle #1
Cycle #2
Cycle #3
Cycle #4
Cycle #5
Cycle #6
.........
Last cycle
Idle
D Word 0
D Word 1
D Word 2
D Word 3
................
D Word N
................
................
*1
Note 1:
Positive edge at the beginning of the first Double Word.
Negative edge at the beginning of the last Double Word.
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相關代理商/技術參數(shù)
參數(shù)描述
MDS213 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:12-Port 10/100Mbps + 1Gbps Ethernet Switch
MDS213CG 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:12-Port 10/100Mbps + 1Gbps Ethernet Switch
MDS217 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC
MDS-21E09 制造商:ITT Interconnect Solutions 功能描述:BACKSHELL - Bulk
MDS21P-6AA-000 制造商:Amphenol Corporation 功能描述:MICRO D/18in WIRE 26AWG 7 STRD THRU HOLE
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