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參數(shù)資料
| 型號(hào)： | RTL8309SB |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | SINGLE-CHIP 9-PORT 10/100MBPS SWITCH CONTROLLER |
| 中文描述： | 單芯片9口10/100Mbps開(kāi)關(guān)控制器 |
| 文件頁(yè)數(shù)： | 82/115頁(yè) |
| 文件大小： | 866K |
| 代理商： | RTL8309SB |
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RTL8309SB
Datasheet
Single-chip 9-port 10/100Mbps Switch Controller
67
Track ID: JATR-1076-21 Rev. 1.4
8.1.4.
10Base-T Transmit Function
The output 10Base-T waveform is Manchester-encoded before it is driven into the network media with a typical 2.3V
amplitude. The internal filter shapes the driven signals to reduce EMI emission, eliminating the need for an external filter. The
harmonic contents are at least 27dB below the fundamental when the RTL8309SB drives an all-ones Manchester-encoded
signal.
8.1.5.
10Base-T Receive Function
The Manchester decoder converts the incoming serial stream to NRZ data when the squelch circuit detects the signal level is
above squelch level.
The squelch circuit eliminates signals with an amplitude lower than 400mV, or with short pulse width, to prevent the decoder
being abnormally triggered by noise at the differential pairs. When the received signal exceeds the squelch level, the internal
PLL locks the input signal and the RTL8309SB will decode a data frame.
8.1.6.
Link Monitor
The 10Base-T link pulse detection circuit continually monitors the RXIP/RXIN pins for the presence of valid link pulses.
Auto-polarity is implemented to correct the detected reverse polarity of RXIP/RXIN signal pairs.
8.1.7.
Power Saving Mode
In power saving mode, the power for the MAC and parts of the PHY transceiver are turned off. The RTL8309SB implements
power saving mode on a per-port basis. A port automatically enters power saving mode 10 seconds after the cable is
disconnected from it. Once a port enters power saving mode, it transmits normal link pulses only on its TXOP/TXON pins and
continues to monitor the RXIP/RXIN pins to detect incoming signals, which might be the 100Base-TX MLT-3 idle pattern,
10Base-T link pulses, or Auto-Negotiation’s FLP (Fast Link Pulse). After it detects an incoming signal, it wakes up from
power saving mode and operates in normal mode according to the result of the connection.
8.1.8.
Power-Down Mode
The RTL8309SB implements power-down mode on a per-port basis. Setting MII Reg.0.11 forces the corresponding port of the
RTL8309SB to enter power-down mode. This disables all transmit/receive functions, except SMI (Serial Management
Interface: MDC/MDIO, also known as MII Management Interface).
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