FPGA-Based Configurable and Highly Flexible PAM4 Serdes Simulation System

The growing advancement of modern digital technologies, including cloud computing
systems, data centers, and high-performance computing infrastructures, has led to an increased
requirement for reliable high-speed data communication. To support efficient data transfer,
Serializer/Deserializer (SerDes) technology is extensively utilized, as it converts parallel data into
serial data for transmission and reconstructs it back into parallel form at the receiving end. This
process helps minimize interconnection complexity while enabling faster communication speeds.
Conventional high-speed communication systems generally use Non-Return-to-Zero (NRZ)
signaling, where one symbol carries a single bit of data. However, with the continuous increase in
communication speed, NRZ signaling faces challenges such as limited bandwidth availability and
signal degradation in high-speed channels. To overcome these drawbacks, modern communication
architectures have adopted Pulse Amplitude Modulation with four levels (PAM4). PAM4 improves
transmission efficiency by using four distinct voltage levels, allowing each symbol to represent two
bits of information and thereby increasing the effective data rate without expanding the required
bandwidth.
In this project, a configurable PAM4 SerDes simulation platform is developed using a Field
Programmable Gate Array (FPGA). FPGA-based implementations provide improved hardware
acceleration and enable faster analysis of communication architectures compared to software-based
simulation methods. The designed system includes important modules such as a Pseudo-Random
Binary Sequence (PRBS) generator and checker, scrambler and descrambler blocks, Gray coding
logic, and PAM4 encoding and decoding units to replicate the operation of a high-speed serial
communication system.
Furthermore, clock gating techniques are incorporated to optimize power efficiency by minimizing
unnecessary switching operations in digital circuits. In synchronous systems, clock gating is
commonly applied to reduce switching power in sequential logic components while preserving
normal circuit functionality.
The developed FPGA-based PAM4 SerDes simulation system offers a flexible platform for
studying high-speed communication architectures and analyzing system performance under various
channel conditions.