PCI Express® Gen3 Retimers

The IDT PCIe® Gen3 Retimer Family offer the industry a blend of top analog performance, lower power, and the most system level features in signal retimers optimized for demanding 2.5 Gbps, 5 Gbps and 8 Gbps applications in computing, storage, and communications.

Features of IDT's PCI retimers include:

  • 8, 16 or 32 channel signal Retimer (4, 8 or 16 PCIe lanes)
  • Advanced signal conditioning features
  • Advanced diagnostic features
  • Protocol-specific features
  • Advanced power saving features
  • I2C programming interface
  • Commercial and Industrial temperature

Download: IDT Signal Integrity Products Overview

Industry-leading PCIe Retimer Products

IDT’s PCIe retimers (signal conditioners) are used to improve signal integrity for enhancing system performance and reliability across long PCB traces or cables. The PCIe retimers remove both random and deterministic jitter from the input signal eliminating inter-symbol interference, and reset the output jitter budget. The devices provide 8, 16 or 32 differential, 8 GT/s PCI Express 3.0 channels, supporting 4, 8, or 16 lanes, respectively. The PCIe retimers also fully support PCI Express 5 GT/s and 2.5 GT/s features.

IDT’s PCIe retimers feature a full CDR architecture with adaptive Decision Feedback Equalizer (DFE) and extensive control options accessed via serial interface. The devices feature a per-channel mini controller that enables self-configuration for optimum performance using automatic adjustment via equalization training. The mini controller manages the functions of each link including 128/130b coding, down-shift for compatibility with PCIe Gen 1 and Gen 2, receiver detection and termination control.

All of IDT’s PCIe retimers implement a non-linear, adaptive, multi-stage equalizer, with analog front-end and 5-tap DFE. The feedback filter of the DFE allows ISI distortion from previous symbols to be removed completely, and with digital quantization eliminates filter output noise. Filter tap weights can be adjusted via serial configuration.

Default equalization, de-emphasis, and TX full-scale swing settings are pin-programmable. The PCIe retimers support extensive configurability for every operating feature configuration as an SMBus or I2C slave device. Additionally, they provide a master mode of operation to download configuration data from a serial-EEPROM. The serial bus also allows for inspection of the numerous status registers.

The PCIe retimers provide a default signal termination setting of 100 ohms nominal for calibrated input terminations and can be programmed to 85 ohms nominal if desired. The input signal detection thresholds can be adjusted for the valid active signal level, supporting electrical idling.

In addition, IDT’s PCIe retimers support both JTAG and AC JTAG to facilitate production board testing, and a built-in pattern generator is provided to enable convenient lab and field tests. Extensive software is available to support test and debug, including a PC utility for setting and saving device configuration, and an eye capture tool supporting remote in-field diagnosis.

The retimer devices use supply voltages of 1.0 V, 1.8 V, and 3.3 V. Multiple features are provided to minimize power consumption, including Active State Power Management (ASPM) of each link.

About PCIe Retimers
High-speed signals can deteriorate to unacceptable levels by the time they reach end receivers, due to transmitter, receiver, and channel characteristics. PCIe retimers ensure minimized jitter and maximized eye opening at the target receiver by compensating for cable and PCB trace attenuation and ISI jitter. This is accomplished by boosting the transmitted signal, by equalizing the received signal, or by doing both when either option by itself is not sufficient due to channel length or due to discontinuities generated by vias and connectors. IDT retimers are ideal for solving signal integrity problems in blade servers, enterprise storage, communication systems, and cloud computing.