參數(shù)資料
型號： KSZ9021GQ
廠商： Micrel Inc
文件頁數(shù)： 14/59頁
文件大?。?/td> 0K
描述： IC TXRX 10/100/1000 3.3V 128PQFP
標準包裝： 66
類型： 收發(fā)器
驅(qū)動器/接收器數(shù)： 8/8
規(guī)程： 千兆位以太網(wǎng)
電源電壓： 3.135 V ~ 3.465 V
安裝類型： 表面貼裝
封裝/外殼： 128-BFQFP
供應(yīng)商設(shè)備封裝： 128-PQFP（14x20）
包裝： 托盤
產(chǎn)品目錄頁面： 1081 (CN2011-ZH PDF)
其它名稱： 576-3396
Micrel, Inc.
KSZ9021GQ
September 2010
21
M9999-091010-1.2
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. KSZ9021GQ 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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