Brochure
112Gbps ELR SerDes IP for TSMC 7nm and 6nm
Overview
Overview
The Cadence 112Gbps Extended Long-Reach (ELR) SerDes IP for TSMC 7nm/6nm operates at a full-rate of 112Gbps using PAM4 modulation and half-rate of 56Gbps using PAM4 modulation, as well as 56/28/10Gbps using NRZ. This IP enables high-speed communications between chips, backplane, and long-haul optical interconnects by converting between parallel data and extremely high-speed serial data streams with improved signal reliability. The ELR PHY provides additional performance margin to highloss and reflective channels by incorporating reflection cancellation and enhanced digital signal processing. The area- and power-optimized design is ideal for high port-density applications that require long-reach and medium-reach links.
The 112G SerDes IP supports primary Ethernet data rates listed in Table 1 within +/- 200ppm. An integrated microcontroller allows for fully autonomous startup, adaptation, and service operation without requiring ASIC intervention. A programming and observation interface is provided via a parallel bus with MDIO-style addressing (port, device, address).
Table 1. Transceiver operating data rates | |
---|---|
PAM4 full-rate | 103.125Gbps, 106.25Gbps |
PAM4 half-rate | 51.5625Gbps, 53.125Gbps |
NRZ full-rate | 51.5625Gbps, 53.125Gbps |
NRZ half-rate | 25.78125Gbps, 26.5625 Gbps |
NRZ 10G | 10.3125Gbps |
There are several comprehensive on-chip diagnostic tools that enable testability and easy debugging. A post-equalized histogram is available for accurate estimation of bit error rate (BER) even in the absence of actual bit errors. Vertical eye statistics can be logged to allow optional optimization of the device settings. The Channel Estimator hardware allows the accurate measurement of the channel response to assess package, connector, and trace characteristics.
Benefits
Key Features
Product Details
There are two instances of the transmitter and the receiver in the IP.
Transmitter
The transmitter (TX) includes standard encoding, a DAC (microcontroller auto-calibrated) that converts digital signals to an analog output, with a digital FIR filter for waveform pre-emphasis. The transmitter drives a 100Ω differential output with adjustable swing.
Receiver
The receiver (RX) includes an analog front-end, an ADC (microcontroller auto-calibrated) that converts the analog input to digital signals, a DSP equalizer, and standard decoding.
Built-In Self Test (BIST)
The TX may be configured to transmit data from an internal PRBS generator using a list of selectable patterns. The RX may similarly be configured to deliver decoded bits to an internal self- synchronizing PRBS checker to count bit errors in the data stream. Received data may be looped back to the transmitter (see Figure 2).
Clocking and Reference Clocks
All timing is derived from an external clock reference via an internal PLL and separate phase interpolators for the TX and RX lanes. The RX timing is locked to the incoming data, while the TX timing reference may be configured to derive either from the external reference, or optionally from the RX timing.