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RTL8211FD-CG Datasheet(PDF) 18 Page - Realtek Semiconductor Corp. |
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RTL8211FD-CG Datasheet(HTML) 18 Page - Realtek Semiconductor Corp. |
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18 / 72 page  RTL8211F(I)/RTL8211FD(I) Datasheet Integrated 10/100/1000M Ethernet Transceiver 11 Track ID: JATR-8275-15 Rev. 1.1 7. Function Description 7.1. Transmitter 7.1.1. 1000Mbps Mode The RTL8211F(I)/RTL8211FD(I)’s PCS layer receives data bytes from the MAC through the RGMII interface and performs generation of continuous code-groups through 4D-PAM5 coding technology. These code groups are passed through a waveform-shaping filter to minimize EMI effect, and are transmitted onto the 4-pair CAT.5 cable at 125MBaud/s through a D/A converter. 7.1.2. 100Mbps Mode The transmitted 4-bit nibbles (TXD[3:0]) from the MAC, clocked at 25MHz (TXCLK), are converted into 5B symbol code through 4B/5B coding technology, then through scrambling and serializing, are converted to 125MHz NRZ and NRZI signals. The NRZI signals are passed to the MLT3 encoder, then to the D/A converter and transmitted onto the media. 7.1.3. 10Mbps Mode The transmit 4-bit nibbles (TXD[3:0]) from the MAC, clocked at 2.5MHz (TXCLK), are serialized into 10Mbps serial data. The 10Mbps serial data is converted into a Manchester-encoded data stream and is transmitted onto the media by the D/A converter. 7.2. Receiver 7.2.1. 1000Mbps Mode Input signals from the media first pass through the on-chip sophisticated hybrid circuit to subtract the transmitted signal from the input signal for effective reduction of near-end echo. The received signal is processed with state-of-the-art technology, such as adaptive equalization, BLW (Baseline Wander) correction, cross-talk cancellation, echo cancellation, timing recovery, error correction, and 4D-PAM5 decoding. The 8-bit-wide data is recovered and is sent to the RGMII interface at a clock speed of 125MHz. The Rx MAC retrieves the packet data from the receive RGMII interface and sends it to the Rx Buffer Manager. 7.2.2. 100Mbps Mode The MLT3 signal is processed with an ADC, equalizer, BLW (Baseline Wander) correction, timing recovery, MLT3 and NRZI decoder, descrambler, 4B/5B decoder, and is then presented to the RGMII interface in 4-bit-wide nibbles at a clock speed of 25MHz. |
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