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參數(shù)資料
| 型號(hào)： | 21176 |
| 英文描述： | Designing 100BASE-TX? 86.8KB (PDF) System with the QFEX Family ? |
| 中文描述： | 設(shè)計(jì)100BASE - TX的？ 86.8KB（PDF格式）系統(tǒng)？與QFEX家庭 |
| 文件頁(yè)數(shù)： | 3/15頁(yè) |
| 文件大小： | 86K |
| 代理商： | 21176 |
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Designing 100BASE-TX Systems with the QFEX Family
3
Figure 2.
MII interface
QFEX Family
The QFEXr device is AMD’s silicon solution to address
the PHY layer for 100BASE-X applications. The QFEXr
device is a CMOS device that implements the PCS and
PMA layers for four 100BASE-X ports, as shown in
Figure 3.
The QFEXr device also offers the following features:
— Programmable Carrier Integrity Monitor (CIM)
for False Carrier event handling
— Quad integrated Digital CMOS 100-Mbps clock
recovery circuit
— Optional scrambler/descrambler functions
— Programmable Loopback modes
— Programmable LED support
— Far End Fault support
— TX or FX support
Figure 3.
Repeater, MII/PCS/PMA (outlined by QFEXr), PMD, MDI layers for 4 ports
The QFEXr device does not offer a PMD layer, but AMD
has a relationship with Pulse Engineering to provide
the necessary MLT-3 and magnetics support for twisted
pair interfacing. The QFEXr device is available in a 100-
pin version.
HIGHER LAYERS
LLC - LOGICAL LINK CONTROL
MAC - MEDIA ACCESS CONTROL
RECONCILIATION
MII
LAN
CSMA/CD
LAYERS
MDI = Medium Dependent Interface
MII = Media Independent Interface
PCS = Physical Coding Sublayer
PMA = Physical Medium Attachment
PHY = Physical Layer Device
PMD = Physical Medium Dependent
*AUTONEG not required for 100BASE-TX only.
PCS
PMA
PMD
AUTONEG*
MDI
100 Mbps
MEDIUM
PHY
OSI
REFERENCE
MODEL LAYERS
APPLICATION
PRESENTATION
SESSION
TRANSPORT
NETWORK
DATA LINK
PHYSICAL
21176B-2
PMD
100BASE-TX/FX
Switch or Repeater
MII MUX Circuitry
PCS0
PCS1
PCS2
PCS3
PMA0
PMA1
PMA2
PMA3
MLT-3 Array
Magnetics Modules
Medium
(Cat5 UTP, STP or Fiber)
MII
(Media
Independent
Interface)
MDI
(Media
Dependent
Interface)
QFEX (in Shared MII Mode)
or QFEXr
(Note: Shared MII for QFEXr)
21176B-3
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