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        Industry-proven Smart Retimers for PCI Express® (PCIe) 4.0, PCIe 5.0, and Compute Express Link™ (CXL) systems.

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Home » Products » Smart Retimers » Aries PCIe/CXL Smart Retimers

Aries PCIe/CXL Smart Retimers

Home » Products » Smart Retimers » Aries PCIe/CXL Smart Retimers
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  • Orderable Information
  • Application Notes
  • Why Use Aries?
  • Videos
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  • Interop Testing
  • Systems & Services

Aries PCIe®/CXL™ Smart Retimers

Astera Labs delivers industry-proven Smart Retimers that overcome signal integrity issues for PCI Express® (PCIe®) 4.0, PCIe 5.0, and Compute Express Link™ (CXL™) systems.

Aries Smart Retimers are purpose-built 100% in the cloud and for the cloud, offering extensive fleet management capabilities and tested for robust, seamless interoperation in our Cloud-Scale Interop Lab. As the #1 choice for CPU / GPU vendors and cloud operators, Aries is the industry’s most widely-deployed and field-tested PCIe / CXL Retimer portfolio.

  • Purpose-built for high-performance server, storage, cloud, and workload-optimized systems
  • Pin- and register-compatible solutions for PCIe 4.0, PCIe 5.0, and CXL in x16 and x8 lane configurations
  • Flexible link bifurcation supporting 1x16, 2x8, 4x4, 8x2, and other combinations enabling completely independent links
  • Compatible with PCIe 4.0, PCIe 5.0, and CXL specifications as well as the Intel PCIe Standard Retimer Footprint
  • Receiver and Transmitter performance exceeds PCIe Base Specification requirements for robust signal and link integrity
  • Protocol-transparent low-latency modes to achieve maximum possible application performance
  • Supports all PCIe clock topologies: SRIS, SRNS, Common Clock
  • Supports hot-plug, loopback, Receiver Lane Margining, self-test modes, and PRBS test modes
  • Advanced in-band and out-of-band diagnostics for fleet management in large-scale system deployments
  • Full-featured C and Python SDKs for rapid integration of advanced diagnostics features
  • Support for Lane reversal and automatic polarity correction
  • Integrated AC-coupling capacitors reduce solution size and improves signal integrity performance
  • Drop-in upgrade from PCIe 4.0 to PCIe 5.0 and CXL
  • Interop and stress tested with all major CPUs, GPUs, switches, and 30+ Endpoints in our Cloud-Scale Interop Lab.
Download Product Brief
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System Block Diagram
Aries Smart Retimers Typical Application Block Diagram

Orderable Information

Aries PCIe Smart Retimers

Orderable Part NumberDocumentsDescriptionPackageMax PCIe GenPCIe LanesPack QuantityOrderingEco StatusMSL Peak TempProduction Status
PT5081LRShttps://www.asteralabs.com/wp-content/uploads/2021/03/Astera_Labs_PT5161L_Product_Brief.pdfAstera Labs CXL/PCIe 5.0 x8 Low-Latency Smart Retimer332-pin FC-CSPPCIe 5.0x 8

180

Contact Us, https://www.asteralabs.com/product-details/PT5081LRS/https://www.asteralabs.com/wp-content/uploads/2021/01/astera-labs-self-compliance-reach-rohs-halogen.pdfLevel-3-260C-168 HRProduction
PT5081LRLhttps://www.asteralabs.com/wp-content/uploads/2021/03/Astera_Labs_PT5161L_Product_Brief.pdfAstera Labs CXL/PCIe 5.0 x8 Low-Latency Smart Retimer332-pin FC-CSPPCIe 5.0x 8

1800

Contact Us, https://www.asteralabs.com/product-details/PT5081LRL/https://www.asteralabs.com/wp-content/uploads/2021/01/astera-labs-self-compliance-reach-rohs-halogen.pdfLevel-3-260C-168 HRProduction
PT5081LXShttps://www.asteralabs.com/wp-content/uploads/2021/03/Astera_Labs_PT5161L_Product_Brief.pdfAstera Labs CXL/PCIe 5.0 x8 Low-Latency Smart Retimer332-pin FC-CSPPCIe 5.0 / CXLx 8

180

Contact Us, https://www.asteralabs.com/product-details/PT5081LXS/https://www.asteralabs.com/wp-content/uploads/2021/01/astera-labs-self-compliance-reach-rohs-halogen.pdfLevel-3-260C-168 HRProduction
PT5081LXLhttps://www.asteralabs.com/wp-content/uploads/2021/03/Astera_Labs_PT5161L_Product_Brief.pdfAstera Labs CXL/PCIe 5.0 x8 Low-Latency Smart Retimer332-pin FC-CSPPCIe 5.0 / CXLx 8

1800

Contact Us, https://www.asteralabs.com/product-details/PT5081LXL/https://www.asteralabs.com/wp-content/uploads/2021/01/astera-labs-self-compliance-reach-rohs-halogen.pdfLevel-3-260C-168 HRProduction
PT5161LXLhttps://www.asteralabs.com/wp-content/uploads/2021/03/Astera_Labs_PT5161L_Product_Brief.pdfAstera Labs CXL/PCIe 5.0 x16 Low-Latency Smart Retimer354-pin FC-CSPPCIe 5.0 / CXLx 16

2400

Contact Us, https://www.asteralabs.com/product-details/pt5161lxl/https://www.asteralabs.com/wp-content/uploads/2021/01/astera-labs-self-compliance-reach-rohs-halogen.pdfLevel-3-260C-168 HRProduction
PT5161LXShttps://www.asteralabs.com/wp-content/uploads/2021/03/Astera_Labs_PT5161L_Product_Brief.pdfAstera Labs CXL/PCIe 5.0 x16 Low-Latency Smart Retimer354-pin FC-CSPPCIe 5.0 / CXLx 16

240

Contact Us, https://www.asteralabs.com/product-details/pt5161lxs/https://www.asteralabs.com/wp-content/uploads/2021/01/astera-labs-self-compliance-reach-rohs-halogen.pdfLevel-3-260C-168 HRProduction
PT5161LRLhttps://www.asteralabs.com/wp-content/uploads/2021/03/Astera_Labs_PT5161L_Product_Brief.pdfAstera Labs CXL/PCIe 5.0 x16 Low-Latency Smart Retimer354-pin FC-CSPPCIe 5.0x 16

2400

Contact Us, https://www.asteralabs.com/product-details/pt5161lrl/https://www.asteralabs.com/wp-content/uploads/2021/01/astera-labs-self-compliance-reach-rohs-halogen.pdfLevel-3-260C-168 HRProduction
PT5161LRShttps://www.asteralabs.com/wp-content/uploads/2021/03/Astera_Labs_PT5161L_Product_Brief.pdfAstera Labs CXL/PCIe 5.0 x16 Low-Latency Smart Retimer354-pin FC-CSPPCIe 5.0x 16

240

Contact Us, https://www.asteralabs.com/product-details/pt5161lrs/https://www.asteralabs.com/wp-content/uploads/2021/01/astera-labs-self-compliance-reach-rohs-halogen.pdfLevel-3-260C-168 HRProduction
PT4080LRLhttps://www.asteralabs.com/wp-content/uploads/2021/01/Astera_Labs_PT4080L_Product_Brief.pdfAstera Labs PCIe 4.0 x8 Low-Latency Smart Retimer332-pin FC-CSPPCIe 4.0x 8

1800

Contact Us, https://www.asteralabs.com/product-details/pt4080lrl/https://www.asteralabs.com/wp-content/uploads/2021/01/astera-labs-self-compliance-reach-rohs-halogen.pdfLevel-3-260C-168 HRProduction
PT4080LRShttps://www.asteralabs.com/wp-content/uploads/2021/01/Astera_Labs_PT4080L_Product_Brief.pdfAstera Labs PCIe 4.0 x8 Low-Latency Smart Retimer332-pin FC-CSPPCIe 4.0x 8

180

Digi-Key, https://www.digikey.com/en/products/detail/astera-labs-inc/PT4080LRS/13881176?s=N4IgTCBcDaIAoBUAsAGAHCkBdAvkA; Mouser, https://www.mouser.com/ProductDetail/Astera-Labs/PT4080LRS/?qs=%2Fha2pyFadui%252BsY0Drb6169B9G43CO6KNeQYhy4%252B6jzASnE%2FjnFg7Gw%3D%3D; Contact Us, https://www.asteralabs.com/product-details/pt4080lrs/https://www.asteralabs.com/wp-content/uploads/2021/01/astera-labs-self-compliance-reach-rohs-halogen.pdfLevel-3-260C-168 HRProduction
PT4161LRLhttps://www.asteralabs.com/wp-content/uploads/2020/08/Astera_Labs_PT4161L_Product_Brief.pdfAstera Labs PCIe 4.0 x16 Low-Latency Smart Retimer354-pin FC-CSPPCIe 4.0x 16

2400

Contact Us, https://www.asteralabs.com/product-details/pt4161lrl/https://www.asteralabs.com/wp-content/uploads/2021/01/astera-labs-self-compliance-reach-rohs-halogen.pdfLevel-3-260C-168 HRProduction
PT4161LRShttps://www.asteralabs.com/wp-content/uploads/2020/08/Astera_Labs_PT4161L_Product_Brief.pdfAstera Labs PCIe 4.0 x16 Low-Latency Smart Retimer354-pin FC-CSPPCIe 4.0x 16

240

Digi-Key, https://www.digikey.com/en/products/detail/astera-labs-inc/PT4161LRS/13881174?s=N4IgTCBcDaIAoBUAsBGAbCkBdAvkA; Mouser, https://www.mouser.com/ProductDetail/390-PT4161LRS/; Contact Us, https://www.asteralabs.com/product-details/pt4161lrs/https://www.asteralabs.com/wp-content/uploads/2021/01/astera-labs-self-compliance-reach-rohs-halogen.pdfLevel-3-260C-168 HRProduction

Evaluation Kits

Evaluation KitImageDocumentsDescriptionMax PCIe GenPCIe LanesPack QuantityOrderingProduction Status
Eclipse PCIe 4.0 x16 GPU Riser CardEclipse PCIe 4.0 x16 GPU Riser Cardhttps://www.asteralabs.com/wp-content/uploads/2020/11/Astera_Labs_Eclipse_Equinox_Product_Brief.pdfAries PCI Express® 4.0 Smart Retimer Riser CardPCIe 4.0x 16

1

Contact Us, https://www.asteralabs.com/products/smart-retimers/pcie-cxl-smart-retimers/order-systems/?system=ECLIPSE-REVAProduction
Equinox PCIe 5.0 x16 Riser CardEquinox PCIe 5.0 x16 Riser Cardhttps://www.asteralabs.com/wp-content/uploads/2020/11/Astera_Labs_Eclipse_Equinox_Product_Brief.pdfAries PCI Express® 5.0 Smart Retimer Riser CardPCIe 5.0x 16

1

Digi-Key, https://www.digikey.com/en/products/detail/astera-labs-inc/EQUINOX-REVA/13982648?s=N4IgTCBcDaIKYEcCuBLAdgewB4gLoF8g; Contact Us, https://www.asteralabs.com/products/smart-retimers/pcie-cxl-smart-retimers/order-systems/?system=EQUINOX-REVAProduction
COMET-REVACOMET-REVAhttps://www.asteralabs.com/wp-content/uploads/2020/08/Astera_Labs_COMET_Product_Brief.pdfAstera Labs USB-to-I2C Communication Module

1

Digi-Key, https://www.digikey.com/en/products/detail/astera-labs-inc/COMET-REVA/13881175?s=N4IgTCBcDaIMYHsC2BTALgAgIYGc0oCcsMAbLAIxxAF0BfIA; Mouser, https://www.mouser.com/ProductDetail/Astera-Labs/COMET-REVA?qs=%2Fha2pyFadujscaAy75Pb6mldQROydX7z1bYmIMd%252Bpx6QoUJRZnAUzA%3D%3D; Contact Us, https://www.asteralabs.com/order-products/?product=COMET-REVAProduction

You may also order from our distributors >

Application Notes

Name Description Type Download
  Fleet Management Made EasyThe Aries Smart Retimer portfolio offers unique features to support multiple PCI Express® and Compute Express Links™ in a system ranging from x16 to x2 width and running at 4.0 (16 GT/s) and 5.0 (32 GT/s) speeds. See how Aries' unique feature set and C-SDK collateral enables a powerful array of Link health monitoring tools for data center server fleet management.White Paper  Request Access
  Aries Compliance TestingThis guide shows how to perform PCIe Transmitter and Receiver compliance tests to ensure your system meets PCI-SIG specifications.Application Note  Request Access
  Aries CScripts TestingThis guide shows how to use the Astera Labs plug-in for CScripts to automate system-level tests of PCIe Links in an Intel-based system. CScripts is a collection of Python scripts which perform tests targeted at exercising different aspects of the PCIe Link Training and Status State Machine (LTSSM).Application Note  Request Access
  Aries IOMTThis guide shows how to use Intel I/O Margin Tool (IOMT) measure I/O performance in an Intel-based server with Aries Smart Retimers’ built-in loopback mode.Application Note  Request Access
  Aries PRBS TestingThis guide shows how to use Aries Smart Retimers’ built-in pseudo-random bit sequence (PRBS) pattern generators and checkers to perform physical-layer stress tests and monitor per-lane margins and bit error rate.Application Note  Request Access
  Aries Pre-RMA ChecklistResolving potential quality issues is a top priority. This step-by-step guide will help to gather critical information in-system prior to initiating an RMA.Application Note  Request Access
  Aries Preset Sweep TestingThis guide shows how to use the Python-SDK to automatically sweep over all Transmitter preset settings to capture the bit error rate (BER), margin information, and other useful performance metrics in a loopback configuration.Application Note  Request Access
  Aries RX Lane MarginingThe PCIe Base Specification has a provision for collecting Receiver margin information from all Receivers in a system during the L0 state of a Link using in-band Control Skip Ordered Sets at 16 GT/s and 32 GT/s. This guide shows how the Aries Smart Retimers supports Lane Margining for both timing and voltage, and an example with the Intel Lane Margining Tool (LMT) is provided.Application Note  Request Access
  Aries Security and RobustnessThis guide covers ways to use the Aries Smart Retimer and the associated C-SDK collateral in a system where security and robustness are critical aspects of maximizing system performance and up-time.Application Note  Request Access
  Aries Self TestThis guide shows how to use the Aries Smart Retimer built-in self-test feature for diagnosing situations where a device is suspected to be damaged or non-functional, possibly due to electrical/thermal over-stress, mechanical damage, etc.Application Note  Request Access

Why Use Aries Smart Retimers?

Aries Smart Retimers are robust, easy-to-use, and designed for enterprise fleet management.

Robustness

Signal Integrity: Best-in-class SerDes exceeds PCIe specification, supports >32 dB (8 GHz) for both TX and RX, <1 dB (8GHz) package insertion loss, PCIe 5.0 drop-in upgrade


Thermals: Integrated heat spreader and thermally-optimized materials simplify thermal design


Interop Testing: Rigorous system testing with 30+ Endpoints and all major Root Complex (Intel, AMD, NVIDIA, etc.)

Ease-of-Use

Total Solution Size: Integrated supply decoupling and AC coupling caps reduce solution size >50% and improve signal quality by avoiding vias


REFCLK: REFCLK repeat feature reduces need for additional CLK buffers


Flexibility: Firmware upgradable through I2C/EEPROM to add features, expose more diagnostics, adjust protocol for misbehaving Endpoints, and more

Fleet Management

Quick Debug: Built-in protocol analyzer with Link state history and timestamps, full non-destructive eye scan for RX Lane margining


Deep Diagnostics: Firmware-driven link health monitoring to alert BMC of any possible link performance issues


System Visibility: The Retimers unique position in the middle of the Link means diagnostic tools can help identify system-level issues before they affect customers

The Difference is Clear

Aries Smart Retimers are a cost-efficient solution to doubling both bandwidth and reach for complex topologies while maintaining low latency.

Aries Smart Retimer Benefits
Aries PCIe 4.0 and PCIe 5.0 Smart Retimer
Generic PCIe Retimer Issues
Generic PCIe 4.0 Retimer

Videos

intel-vision-video-thumbnail
08 Jun
Intel Vision 2022

Check out this demo video from Intel Vision featuring our Aries PCIe® Smart Retimers enabling robust PCIe 5.0 connectivity with KIOXIA America, Inc. SSDs and Intel Corporation’s Sapphire Rapids CPU.

Deploy Robust PCIe 5.0 Connectivity wit hAries Smart Retimers
08 Mar
Deploy Robust PCIe® 5.0 Connectivity with Aries Smart Retimers

See our Aries Smart Retimers in action via two interoperability demonstrations with key industry partners’ PCIe® 5.0 root complex and endpoints.

Unlock-the-Full-Potential-of-CXL
10 Nov
Unlock the Full Potential of CXL™ with Purpose-Built Connectivity Solutions from Astera Labs

Meet the Leo CXL™ Memory Accelerator Platform and Aries CXL Smart Retimers – Astera Labs’ portfolio of solutions that unlock the full potential of data-centric systems based on Compute Express Link™ technology.

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FAQ

What are the benefits of Aries PCIe Smart Retimers compared to general-purpose retimers?

Astera Labs Aries PCIe Smart Retimers offer exceptional robustness, ease-of-use and a list of Fleet Management capabilities. Get more details >

How to determine if a retimer is required?

There are generally three ways to approach this:

  1. Channel Loss Budget Analysis
  2. Simulate channel s-parameter in the Statistical Eye Analysis Simulator (SeaSim) tool to determine if post-equalized eye height (EH) and eye width (EW) meet the minimum eye opening requirements: ≥15 mV EH and ≥0.3 UI EW at Bit Error Ratio (BER) ≤ 10-12.
  3. Consider your cost threshold for system upgrades

View Signal Integrity Challenges for PCIe 5.0 OCP Topologies Video >

What are the differences between Retimers and Redrivers?

A redriver amplifies a signal, whereas a retimer retransmits a fresh copy of the signal.

Get a Detailed Comparison >

How much dB can a Retimer support?

For PCIe 5.0, 36 dB pre channel and 36 dB post channel. So ideally, with one retimer, the total loss from Root Complex to End Point is 72 dB. And with two retimers cascaded, the total loss from Root Complex to End Point is 108 dB, leaving 10-20% margin from a system design point of view.

How to fine tune a Retimer EQ setting?

There is no need to fine tune a retimer EQ setting as it participates in Link Equalization with Root Complex and End Points and automatically fine tunes the receiver EQ.

What is the maximum number of cascaded Retimers allowed?

The maximum number to cascade retimers in a link is 2, which is defined in PCIe specification.

Get a Detailed Explanation on the PCI-SIG blog >

If equalization can be bypassed in Retimers in PCIe 5.0 architecture, how would an Endpoint (EP) detect if there is a Retimer present?

Even when equalization is bypassed, a Retimer will still assert the Retimer Present bit (TS2 symbol 5, bit 4) in 2.5 GT/s data rate so that the Root Complex and EP can learn that a Retimer is present in the link.

Are there special considerations during link training to avoid timeouts when using Retimers?

There are no “special” considerations. During Equalization, the Retimer’s upstream pseudo port (USPP) and the Endpoint will simultaneously train their receivers, with a total time of 24ms to do this. This will also happen with the downstream pseudo port (DSPP) and the root complex. The timeouts are the same regardless of whether a Retimer is present or not.

Is a Retimer essentially a two-port PCIe packet switch?

Not quite, each port of a packet switch has a full PCIe protocol stack:
Physical Layer, Data Link Layer, and Transaction Layer.

A packet switch has at least one root port and at least one non-root port.

A Retimer, by contrast, has an upstream-facing Physical Layer and a downstream-facing Physical Layer but no Data Link or Transaction Layer.

As such, a Retimer’s ports are considered pseudo ports because a Retimer does not have — nor does it need — these higher-logic layers, the latency through a Retimer is much smaller compared to the latency through a packet switch.

Is there a difference in Retimer functionality from PCIe 5.0 specification compared to PCIe 4.0 specification?

The only notable differences are:

  • As with all PCIe 5.0 transmitters, the Retimer’s transmitters must support 32 GT/s precoding when requested by the link partner.
  • As with all PCIe 5.0 receivers, the Retimer’s receivers must support Lane Margining in both time and voltage.
Other than keeping the same throughput, is a Retimer required to support different link widths for its upstream/downstream ports?

A Retimer is required to have the same link width on its upstream-facing port and on its downstream-facing port. In other words, the link widths must match. A Retimer must also support down-configured link widths, but the width must always be the same on both ports.

Why is a Redriver not recommended for the PCIe 5.0 and PCIe 4.0 Specifications?

Redrivers are not defined or specified within the PCIe Base Specification, so there are no formal guidelines for using a Redriver versus using a Retimer. This topic is covered in more detail in this article:

PCI Express® Retimers vs. Redrivers: An Eye-Popping Difference.

Do you suggest putting the Retimer close to the receiver?

A Retimer’s transmitters and receivers, on both pseudo ports, must meet the PCIe Base Specifications. This means that a Retimer can support the full channel budget (nominally 36 dB at 16 GHz) on both sides — before and after the Retimer. Calculating the insertion loss (IL) budget should be done separately for each side of the Retimer, and channel compliance should be performed for each side as well, just as you would do for a Retimer-less Root-Complex-to-Endpoint link.

If a Redriver or Retimer is present, is there any way to enable or disable the Redriver or Retimer?

Redrivers and Retimers are active components which impact the data stream: their package imposes signal attenuation, their active circuits apply boost, and (in the case of Retimers) clock and data recovery. As such, there is no way to truly disable these components and still have data pass through. When disabled, no data will pass through a Redriver or Retimer.

How to decide between enhanced PCB material or Retimers to solve signal integrity issues?
  1. Determine if a Retimer is needed based on different PCB materials
  2. Define a simulation space, and identify worst-case conditions (temperature, humidity, impedance, etc.), minimum set of parameters (e.g., Transmitter Presets)
  3. Define the evaluation criteria, such as minimum eye height/width
  4. Execute and analyze results

View Signal Integrity Challenges for PCIe 5.0 OCP Topologies Video >

How to define evaluation criteria?

Bit error rate (BER) is the ultimate gauge of link performance, but an accurate measure of BER is not possible in relatively short, multi-million-bit simulations.

Instead, this analysis suggests the following pass/fail criteria, which consist of two rules:

    1. A link must meet the receiver’s eye height (EH) and eye width (EW) requirements
    2. A link must meet criteria 1 for at least half of Tx Preset settings (≥5 out of 10)
  • Criteria 1 establishes that the there is a viable set of settings, which results in the desired BER. The specific EH and EW required by the receiver is implementation-dependent.
  • Criteria 2 ensures that the link has adequate margin and is not overly sensitive to the Tx Preset setting.

View Signal Integrity Challenges for PCIe 5.0 OCP Topologies Video >

How to execute and analyze results?

Use IBIS model and time domain simulations.

Have more questions about general topics, such as PCIe 5.0, ordering, quality, etc.? See the full list of FAQs.

PCIe Retimers to the Rescue

Learn how to address PCIe 4.0 and PCIe 5.0 signal integrity and channel insertion loss challenges with Smart Retimer technology.

View Webinar

Get Interop Testing That's Optimized for Your PCIe and CXL Designs

Aries Smart Retimers are rigorously tested with all major root complexes and an ever-increasing range of PCIe / CXL endpoints to ensure seamless interoperation and low-risk designs. Each device is put through our exhaustive testing regime that uses the latest systems from Intel and AMD to exercise the PCIe / CXL link to the target endpoint with a battery of tests over thousands of iterations.

Cloud-Scale Interop Lab

Hardware Solutions

Rapidly implement diverse system topologies using our plug-and-play connectivity system boards. Our solutions include:

  • Smart Cable Modules: Active Copper-Based Solution to Address Reach, Signal Integrity and Bandwidth Utilization Issues for 100G/Lane Ethernet Switch-to-Switch and Switch-to-Server Interconnects.
  • Riser Cards: Extend PCIe/CXL technology slots and enable incredibly complex multi-connector topologies.
  • PCIe-Over-Cable Extender Cards: Connect a server head-node to a JBoF or JBoG without sacrificing speed.
  • GPU Booster Cards: Support external graphics (eGPUs) and enhance the gaming experience.

See our Hardware Solutions >

Services

Rapidly design and achieve signal integrity peace of mind and avoid wondering if a PCIe 4.0/5.0, CXL 1.1/2.0 or 100G/Lane Ethernet technology-based design will work. Our team can help develop first-pass design success and accelerate time to market for your systems and boards.

Contact us for more information about our design and testing services >

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