The XCKU085-L1FLVA1517I is a high-performance, low-power Xilinx FPGA from AMD’s Kintex UltraScale family — engineered for demanding applications in 100G networking, data centers, medical imaging, 8K video, and wireless infrastructure. Built on a 20nm process node and housed in a 1517-pin FCBGA package, this device offers an industry-leading blend of DSP bandwidth, logic density, and power efficiency for mid-range FPGA designs.

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What Is the XCKU085-L1FLVA1517I?

The XCKU085-L1FLVA1517I is a Field Programmable Gate Array (FPGA) manufactured by AMD (formerly Xilinx). It belongs to the Kintex UltraScale product family — AMD’s mid-range FPGA series built on 20nm TSMC technology using the UltraScale ASIC-grade architecture. The “L1” speed grade designation identifies this as a low-power variant, making it especially suitable for thermally constrained or battery-sensitive system designs.

This part number decodes as follows:

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XCKU085-L1FLVA1517I Key Specifications

The table below summarizes all critical electrical and physical parameters of the XCKU085-L1FLVA1517I:

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XCKU085-L1FLVA1517I Architecture: Kintex UltraScale Design

ASIC-Grade UltraScale Architecture

The XCKU085-L1FLVA1517I is built on AMD’s UltraScale architecture — the first FPGA architecture to implement an ASIC-like clocking methodology. This approach delivers drastically reduced clock skew, minimized power consumption from clock distribution, and deterministic timing closure. The architecture also integrates configurable logic blocks (CLBs), DSP slices, block RAM, and high-speed transceivers into a single coherent fabric.

20nm Process Node Advantages

Manufactured on TSMC’s 20nm process, the XCKU085-L1FLVA1517I achieves up to 40% lower power consumption compared to previous-generation 28nm Kintex-7 FPGAs. The 20nm node enables higher transistor density without proportional increases in static power — a key advantage for thermal-sensitive embedded and communications designs.

SSI Technology Support

The Kintex UltraScale family supports Stacked Silicon Interconnect (SSI) technology, enabling larger devices to be assembled from multiple silicon dies with ultra-high-bandwidth die-to-die interconnects. While the KU085 device at this package size uses a monolithic die, the broader UltraScale architecture is SSI-compatible — ensuring design portability across the KU085 to KU115 product range.

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Logic and Memory Resources

Configurable Logic Blocks (CLBs)

With 497,520 logic blocks and 1,088,325 logic cells, the XCKU085-L1FLVA1517I provides ample resources for complex state machines, protocol controllers, and parallel processing architectures. The UltraScale CLB design uses a look-up table (LUT) structure optimized for both logic and memory functions.

Block RAM and On-Chip Memory

The device integrates 56,900 Kbits of total RAM, distributed across dedicated block RAM (BRAM) primitives. This on-chip memory enables high-throughput buffering for packet processing, image pipelines, and data caching — without requiring off-chip SRAM.

DSP Slices

The Kintex UltraScale KU085 device contains a high density of DSP48E2 slices — optimized hard arithmetic blocks supporting multiply-accumulate (MAC) operations, FIR filters, FFTs, and other signal processing workloads. The DSP-to-logic ratio in Kintex UltraScale is among the highest in mid-range FPGAs, making it the preferred choice for 5G baseband, radar DSP, and imaging pipelines.

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I/O and Transceiver Capabilities

User I/O and Bank Structure

The XCKU085-L1FLVA1517I offers 624 user I/Os through the 1517-pin FCBGA package, organized into configurable I/O banks. These banks support a wide range of I/O standards:

High-Speed Serial Transceivers

The KU085 device integrates next-generation GTH transceivers capable of line rates up to 16.3 Gb/s per lane. These support industry-standard serial protocols essential for modern system design:

Clock Management

The XCKU085-L1FLVA1517I integrates MMCM (Mixed-Mode Clock Manager) and PLL primitives for flexible clock synthesis, multiplication, division, and phase shifting. The UltraScale ASIC-like clock network minimizes skew across the device fabric — critical for high-frequency pipelined designs exceeding 630 MHz.

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Power Characteristics of the L1 Low-Power Speed Grade

The L1 (Low Voltage) speed grade is optimized for power-sensitive deployments. Compared to standard -1 and -2 speed grades, the L1 variant operates at a reduced core voltage range of 0.922V to 0.979V, enabling lower dynamic and static power consumption.

The L1 speed grade is especially well-suited for designs where power budgets are constrained but industrial-grade temperature reliability (-40°C to +100°C) is still required.

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Target Applications for XCKU085-L1FLVA1517I

100G Networking and Data Center

With native support for 100G Ethernet MAC and 150G Interlaken, the XCKU085-L1FLVA1517I is purpose-built for packet processing, network acceleration, and SmartNIC designs. Its high transceiver density and logic resources support full line-rate processing at 100G without external ASICs.

Wireless Infrastructure (5G / LTE)

The Kintex UltraScale KU085 is widely deployed in heterogeneous wireless infrastructure including Remote Radio Heads (RRH), Digital Front End (DFE), and baseband units. Its JESD204B transceiver support and high DSP count make it a natural fit for Massive MIMO, beamforming, and pre-distortion processing.

Medical Imaging

High-resolution medical imaging — including MRI reconstruction, CT image processing, and ultrasound beamforming — demands both low latency and deterministic processing. The KU085’s combination of high BRAM, DSP slices, and GTH transceivers makes it an ideal FPGA for next-generation medical imaging platforms.

8K / Professional Video

The device supports 8K4K video processing applications, including real-time video encode/decode, image processing pipelines, and broadcast infrastructure. Its high memory bandwidth and wide I/O bus width enable full-resolution frame buffering and pixel manipulation.

Defense and Aerospace

With an industrial temperature rating (-40°C to +100°C) and RoHS compliance, the XCKU085-L1FLVA1517I meets the environmental requirements of rugged defense and aerospace designs — from radar signal processing to secure communications.

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Package Information: 1517-Pin FCBGA (FLVA1517)

The XCKU085-L1FLVA1517I is packaged in AMD’s FLVA1517 flip-chip BGA, one of three available package sizes for the KU085 die. The 1517-ball package provides a balance between routing density and PCB complexity:

For designs requiring more I/O, AMD also offers the FLVB1760 (676 I/O) and FLVF1924 packages for the same KU085 die.

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Development Tools and Software Support

The XCKU085-L1FLVA1517I is fully supported by AMD’s Vivado Design Suite — the primary FPGA development environment for all UltraScale devices. Vivado provides:

• RTL Synthesis — Verilog and VHDL support
• Implementation — Place, route, and timing closure
• IP Integrator — Block design with pre-verified IP cores
• Simulation — Integrated behavioral simulation
• Partial Reconfiguration — Dynamic FPGA reconfiguration support
• Power Analysis — Post-implementation power estimation

The MicroBlaze soft processor can be instantiated on-fabric, running over 200 DMIPS with DDR3/DDR4 memory support — enabling embedded software execution directly on the FPGA.

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Ordering and Availability

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Frequently Asked Questions

Q: What does the “L1” speed grade mean in XCKU085-L1FLVA1517I? The “L” prefix designates a low-power speed grade. The L1 variant is optimized to consume less power than standard -1 or -2 speed grades, while maintaining the same operating temperature range and package compatibility.

Q: What is the difference between XCKU085-L1FLVA1517I and XCKU085-1FLVA1517I? The XCKU085-L1FLVA1517I uses a low-power (L1) speed grade optimized for reduced power envelopes. The XCKU085-1FLVA1517I uses the standard -1 speed grade. Both share the same die, package, industrial temperature rating, and I/O count.

Q: Is the XCKU085-L1FLVA1517I RoHS compliant? Yes. The XCKU085-L1FLVA1517I is fully RoHS compliant, meeting international environmental regulations for electronic components.

Q: What design software supports the XCKU085-L1FLVA1517I? AMD Vivado Design Suite (2014.1 and later) provides full support for synthesis, implementation, and programming of the XCKU085-L1FLVA1517I.

Q: What are the supported memory interfaces? The KU085 device supports DDR4, DDR3, LPDDR4, QDR-II+, and Hybrid Memory Cube (HMC) through hard memory controllers and flexible I/O banks.