Integrated 10/100/1000M Ethernet Transceiver
Track ID: JATR-8275-15 Rev. 1.1
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.
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.
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.
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
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.