参数资料
型号: KSZ9021GN TR
厂商: Micrel Inc
文件页数: 9/53页
文件大小: 0K
描述: TXRX ETHERNET GB GMII/MII 64MLF
标准包装: 1,000
类型: 收发器
驱动器/接收器数: 8/8
规程: 千兆位以太网
电源电压: 3.135 V ~ 3.465 V
安装类型: 表面贴装
封装/外壳: 64-VFQFN 裸露焊盘
供应商设备封装: 64-QFN(8x8)
包装: 带卷 (TR)
配用: 576-3873-ND - BOARD EVALUATION FOR KSZ9021GN
Micrel, Inc.
KSZ9021GN
September 2010
17
M9999-091010-1.1
Functional Description: 1000Base-T Transceiver
The 1000Base-T transceiver is based-on a mixed-signal / digital signal processing (DSP) architecture, which includes
the analog front-end, digital channel equalizers, trellis encoders/decoders, echo cancellers, cross-talk cancellers,
precision clock recovery scheme, and power efficient line drivers.
The following figure shows a high-level block diagram of a single channel of the 1000Base-T transceiver for one of the
four differential pairs.
CLOCK
GENERATION
BASELINE
WANDER
COMPENSATION
ECHO
CANCELLER
TRANSMIT
BLOCK
NEXT Canceller
NEXT
CANCELLER
RX-
ADC
AGC
+
FFE
SLICER
CLOCK & PHASE
RECOVERY
AUTO-
NEGOTIATION
PMA STATE
MACHINES
MII
REGISTERS
MII
MANAGEMENT
CONTROL
DFE
ANALOG
HYBRID
PCS STATE
MACHINES
PAIR SWAP
&
ALIGN UNIT DESCRAMBLER
+
DECODER
SIDE-STREAM
SCRAMBLER
&
SYMBOL ENCODER
LED DRIVER
XTAL
OTHER
CHANNELS
TX
SIGNAL
RX
SIGNAL
Figure 2. KSZ9021GN 1000Base-T Block Diagram – Single Channel
Analog Echo Cancellation Circuit
In 1000Base-T mode, the analog echo cancellation circuit helps to reduce the near-end echo. This analog hybrid circuit
relieves the burden of the ADC and the adaptive equalizer.
This circuit is disabled in 10Base-T/100Base-TX mode.
Automatic Gain Control (AGC)
In 1000Base-T mode, the automatic gain control (AGC) circuit provides initial gain adjustment to boost up the signal
level. This pre-conditioning circuit is used to improve the signal-to-noise ratio of the receive signal.
Analog-to-Digital Converter (ADC)
In 1000Base-T mode, the analog-to-digital converter (ADC) digitizes the incoming signal. ADC performance is essential
to the overall performance of the transceiver.
This circuit is disabled in 10Base-T/100Base-TX mode.
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