At Rambus, we create cutting-edge semiconductor and IP products, spanning memory and interfaces to security, smart sensors and lighting.
PCIe 5.0 SerDes PHY
The Rambus PCI Express (PCIe) 5.0 and Compute Express Link (CXL) 2.0 PHY is a low-power, area-optimized, silicon IP core designed with a system-oriented approach to maximize flexibility and ease of integration. It delivers up to 32 GT/s signaling rates in performance-intensive applications for artificial intelligence (AI), data center, edge, 5G infrastructure and graphics. With the Rambus PCIe 5.0 controller core, it comprises a complete PCIe 5.0 SerDes subsystem. Alternatively, it is integrated with the Rambus CXL 2.0 controller core for a complete CXL interconnect subsystem.
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Product BriefHow the PCIe 5.0 Interface Works
The Rambus PCI Express 5.0 PHY with the PLDA PCIe 5.0 digital controller comprise a high-performance serial link subsystem. Optimized for power in challenging, high-loss channels, our PCIe 5.0 interface solution is ideal for performance-intensive AI, data center, edge, 5G infrastructure and graphics applications. The PHY consists of a PMA hard macro that supports PCIe 5.0, 4.0, 3.0 and 2.0 protocols and a physical coding sublayer (PCS) soft macro for PCIe that is PIPE 5.1 compliant. Integrated with the Rambus PCIe 5.0 digital controller, the PHY alternatively can be paired with 3rd-party PIPE 5.1-compliant controllers.
Designed with a minimal set of broadside controls, the PHY is configurable in x2, x4, x8 and x16 lane configurations with bifurcation support. This gives the PHY improved flexibility and support for a wide range of applications. Multi-tap transmitter and adaptive receiver equalization supports more than 36dB of channel insertion loss.
The PCIe 5 SerDes PHY is available on an advanced 7nm FinFET process node.
Data Center Evolution: Accelerating Computing with PCI Express 5.0
The PCI Express® (PCIe) interface is the critical backbone that moves data at high bandwidth between various compute nodes such as CPUs, GPUs, FPGAs, and workload-specific accelerators. The rise of cloud-based computing and hyperscale data centers, along with high-bandwidth applications like artificial intelligence (AI) and machine learning (ML), require the new level of performance of PCI Express 5.0.Solution Offerings
Features
Deliverables
Services
Features
- Complete PCIe 5.0 interface subsystem solution with PLDA PCIe 5.0 digital controller core
- Complete CXL 2.0 interface subsystem solution with PLDA CXL 2.0 digital controller core
- PHY supports CXL interface specification
- Duplex lane configurations of x1, x2, x4, x8 and x16 with bifurcation support
- Flexible ASIC clocking
- Multi-tap Tx Finite Impulse Response (FIR) equalizer with multi-level de-emphasis
- Continuous-time linear equalizer (CTLE) and multi-tap decision feedback equalizer (DFE) capable of compensating more than 36dB of channel insertion loss across PVT
- Support for transmitter and receiver spread spectrum clocking (SSC) to meet FCC regulations for electro-magnetic interference (EMI)
- Expandable register interface enabling communication with multiple PMAs and PCS-BIST soft macros
- Built-in self test (BIST) with ATPG and AC/DC Boundary scan support
- Built-in per-channel PRBS-7, 9, 11, 15, 23, 31 and user-defined pattern generation and checking for standalone loopback testing
- In-situ real-time monitoring and receive data eye schmoo enabling PCIe RX margining feature
- Operation across a wide temperature range (-40 C to +125 )
- Automatic calibration of key circuits to maximize performance and yields
Deliverables
- PMA Hard Macro
- Verilog models
- LEF abstracts (.lef)
- Timing models (.lib)
- CDL netlists (.cdl)
- ATPG models
- IBIS-AMI models
- GDSII layout
- DRC & LVS reports
- PCS-BIST Soft Macro
- RTL model
- Datasheet
- SoC Integration guide
Services
Comprehensive Chip and System Design Reviews
- Kickoff/Program Review
- Floor plan Review
- Test/Characterization Plan Review
- Package Design Review
- Board Design Review
- Final Chip Integration Review
- Bring-up and Test Review
Engineering Design Services:
- Package design
- System board layout
- Statistically-based signal and power integrity analysis
Protocol Compatibility
| Protocol | Signaling Rate (GT/s) | Application |
|---|---|---|
| PCIe 2.0 | 5 | High bandwidth peripherals and graphics |
| PCIe 3.0 | 8 | Servers, storage, networking devices |
| PCIe 4.0 | 16 | Servers, storage, networking devices |
| PCIe 5.0 | 32 | AI, servers, storage, networking, 5G infrastructure |
SerDes Signal Integrity Challenges at 28Gbps and Beyond
Maintaining signal integrity has become increasingly difficult as data rates moves past 28Gbps to 56Gbps and beyond. Up to 28Gbps rates, NRZ is the preferred and standardized encoding scheme which consists of 1’s and 0’s. NRZ is also referred to as PAM2 (pulse amplitude modulation, 2-level), due to its two amplitude levels which contain 1 bit of information in every symbol. With serial data rates hitting 56 Gb/s per channel, signal impairments caused by increased bandwidth has prompted the high-speed serial data industry to adopt PAM4, or 4-level pulse amplitude modulation.Inventions
Phase Interpolator-Based CDR
Reduces cost, power and area of clock and data recovery (CDR) circuit and improves jitter performance in high-speed parallel and serial links versus PLL-based CDRs.
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