Non-Transparent Bridge
Enabling Low-Latency CPU-to-CPU Interconnects
RT = Retimer
Requirements & Challenges
- CPUs on different server nodes interconnect via back plane, and passing through multiple connectors at PCIe® 4.0 and PCIe 5.0 speeds causes more reflections and insertion loss
- Low-latency interconnect required between CPUs makes PCIe switches undesirable
- Each base board has its own clocking domain, so the NTB must support separate reference clocks
Aries Retimer Benefits
- Retimers can be cascaded for extra-long back plane PCBs, or cabled NTB applications
- Protocol-transparent low-latency modes enable < 10 ns added latency between CPUs
- Supports separate reference clock to accommodate PCIe interconnect without needing to send REFCLK across the midplane
Similar Applications
Products
| Orderable Part Number | Documents | Description | Package | Max PCIe Gen | PCIe Lanes | Pack Quantity | Ordering |
|---|---|---|---|---|---|---|---|
| PT5081LRS | https://www.asteralabs.com/wp-content/uploads/2021/03/Astera_Labs_PT5161L_Product_Brief.pdf | Astera Labs CXL/PCIe 5.0 x8 Low-Latency Smart Retimer | 332-pin FC-CSP | PCIe 5.0 | x 8 | 180 | Contact Us, https://www.asteralabs.com/product-details/PT5081LRS/ |
| PT5081LRL | https://www.asteralabs.com/wp-content/uploads/2021/03/Astera_Labs_PT5161L_Product_Brief.pdf | Astera Labs CXL/PCIe 5.0 x8 Low-Latency Smart Retimer | 332-pin FC-CSP | PCIe 5.0 | x 8 | 1800 | Contact Us, https://www.asteralabs.com/product-details/PT5081LRL/ |
| PT5081LXS | https://www.asteralabs.com/wp-content/uploads/2021/03/Astera_Labs_PT5161L_Product_Brief.pdf | Astera Labs CXL/PCIe 5.0 x8 Low-Latency Smart Retimer | 332-pin FC-CSP | PCIe 5.0 / CXL | x 8 | 180 | Contact Us, https://www.asteralabs.com/product-details/PT5081LXS/ |
| PT5081LXL | https://www.asteralabs.com/wp-content/uploads/2021/03/Astera_Labs_PT5161L_Product_Brief.pdf | Astera Labs CXL/PCIe 5.0 x8 Low-Latency Smart Retimer | 332-pin FC-CSP | PCIe 5.0 / CXL | x 8 | 1800 | Contact Us, https://www.asteralabs.com/product-details/PT5081LXL/ |
| PT5161LXL | https://www.asteralabs.com/wp-content/uploads/2021/03/Astera_Labs_PT5161L_Product_Brief.pdf | Astera Labs CXL/PCIe 5.0 x16 Low-Latency Smart Retimer | 354-pin FC-CSP | PCIe 5.0 / CXL | x 16 | 2400 | Contact Us, https://www.asteralabs.com/product-details/pt5161lxl/ |
| PT5161LXS | https://www.asteralabs.com/wp-content/uploads/2021/03/Astera_Labs_PT5161L_Product_Brief.pdf | Astera Labs CXL/PCIe 5.0 x16 Low-Latency Smart Retimer | 354-pin FC-CSP | PCIe 5.0 / CXL | x 16 | 240 | Contact Us, https://www.asteralabs.com/product-details/pt5161lxs/ |
| PT5161LRL | https://www.asteralabs.com/wp-content/uploads/2021/03/Astera_Labs_PT5161L_Product_Brief.pdf | Astera Labs CXL/PCIe 5.0 x16 Low-Latency Smart Retimer | 354-pin FC-CSP | PCIe 5.0 | x 16 | 2400 | Contact Us, https://www.asteralabs.com/product-details/pt5161lrl/ |
| PT5161LRS | https://www.asteralabs.com/wp-content/uploads/2021/03/Astera_Labs_PT5161L_Product_Brief.pdf | Astera Labs CXL/PCIe 5.0 x16 Low-Latency Smart Retimer | 354-pin FC-CSP | PCIe 5.0 | x 16 | 240 | Contact Us, https://www.asteralabs.com/product-details/pt5161lrs/ |
| COMET-REVA | https://www.asteralabs.com/wp-content/uploads/2020/08/Astera_Labs_COMET_Product_Brief.pdf | Astera Labs USB-to-I2C Communication Module | 354-pin FC-CSP | 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-REVA | ||
| Equinox PCIe 5.0 x16 Riser Card | https://www.asteralabs.com/wp-content/uploads/2020/11/Astera_Labs_Eclipse_Equinox_Product_Brief.pdf | Aries PCI Express® 5.0 Smart Retimer Riser Card | 354-pin FC-CSP | PCIe 5.0 | x 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-REVA |
| Eclipse PCIe 4.0 x16 GPU Riser Card | https://www.asteralabs.com/wp-content/uploads/2020/11/Astera_Labs_Eclipse_Equinox_Product_Brief.pdf | Aries PCI Express® 4.0 Smart Retimer Riser Card | 354-pin FC-CSP | PCIe 4.0 | x 16 | 1 | Contact Us, https://www.asteralabs.com/products/smart-retimers/pcie-cxl-smart-retimers/order-systems/?system=ECLIPSE-REVA |
| PT4080LRL | https://www.asteralabs.com/wp-content/uploads/2021/01/Astera_Labs_PT4080L_Product_Brief.pdf | Astera Labs PCIe 4.0 x8 Low-Latency Smart Retimer | 332-pin FC-CSP | PCIe 4.0 | x 8 | 1800 | Contact Us, https://www.asteralabs.com/product-details/pt4080lrl/ |
| PT4080LRS | https://www.asteralabs.com/wp-content/uploads/2021/01/Astera_Labs_PT4080L_Product_Brief.pdf | Astera Labs PCIe 4.0 x8 Low-Latency Smart Retimer | 332-pin FC-CSP | PCIe 4.0 | x 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/ |
| PT4161LRL | https://www.asteralabs.com/wp-content/uploads/2020/08/Astera_Labs_PT4161L_Product_Brief.pdf | Astera Labs PCIe 4.0 x16 Low-Latency Smart Retimer | 354-pin FC-CSP | PCIe 4.0 | x 16 | 2400 | Contact Us, https://www.asteralabs.com/product-details/pt4161lrl/ |
| PT4161LRS | https://www.asteralabs.com/wp-content/uploads/2020/08/Astera_Labs_PT4161L_Product_Brief.pdf | Astera Labs PCIe 4.0 x16 Low-Latency Smart Retimer | 354-pin FC-CSP | PCIe 4.0 | x 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/ |