AMD XC4VLX40-11FFG668C

Overview

XC4VLX40-11FFG668C from AMD (formerly Xilinx) is a Virtex-4 LX family FPGA with 41,472 logic cells, 2.5 Gbps multi-gigabit transceivers, and embedded PowerPC 405 cores. It features 2,016 Kbits of block RAM, 128 DSP48 slices, and operates at -11 speed grade (1.1 ns CLB delay). It is used in high-performance digital signal processing and reconfigurable computing systems.

For engineers reviewing the XC4VLX40-11FFG668C datasheet, pinout, applications, or equivalent options, key selection factors include I/O count (448 user I/Os), transceiver compliance (Xilinx SelectIO™ and RocketIO™), thermal design margin for FFG668 package, and compatibility with ISE 14.7 toolchain.

Technical Context

The XC4VLX40-11FFG668C implements a hierarchical FPGA architecture with configurable logic blocks (CLBs), distributed RAM, and dedicated routing resources. It integrates dual PowerPC 405 RISC processors, 128 DSP48 arithmetic units, and 24 RocketIO transceivers supporting protocols including PCI Express Gen1 and Serial RapidIO.

This device supports SelectIO standards including LVDS, SSTL, HSTL, and GTL+, with programmable drive strength and on-die termination. Its -11 speed grade guarantees timing closure for designs targeting 500 MHz system clocks and 1.25 Gbps serial links under industrial temperature conditions (0°C to 85°C).

Key Specifications

Pinout & Package

XC4VLX40-11FFG668C is housed in a 668-pin Fine-Pitch Flip-Chip Ball Grid Array (FFG668) package with 35 mm × 35 mm body size, 1.0 mm ball pitch, and Pb-free (RoHS-compliant) solder balls. Thermal pad on underside requires controlled PCB thermal via pattern per Xilinx UG070.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-density reconfigurable logic applications.

Compared with XC4VLX40-11FFG668C, XC4VLX60-11FFG676C offers headroom for logic growth but increases PCB complexity, while XC5VLX50T-1FFG665C modernizes transceiver and memory interface capabilities at the cost of embedded processor functionality.

Availability

XC4VLX40-11FFG668C is available at Aetrix Electronics and suitable for radar signal processing, medical imaging acceleration, and avionics data concentrators requiring stable component supply across extended product lifecycles.

Supply support for XC4VLX40-11FFG668C includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

AMD acquired Xilinx in 2022 and now develops adaptive computing platforms combining FPGA, ACAP, and CPU/GPU technologies for data center, AI, and embedded markets.

The Virtex-4 family was designed by Xilinx to deliver high-performance reconfigurable logic with embedded processors and serial transceivers for demanding compute-intensive and protocol-rich applications.

FAQ

What is the maximum supported I/O standard voltage for XC4VLX40-11FFG668C?

XC4VLX40-11FFG668C supports I/O voltages from 1.2 V to 3.3 V per bank, with VCCO programmable independently for each of its 24 I/O banks. This enables mixed-voltage operation such as interfacing 1.8 V memory with 3.3 V control logic. The device complies with LVCMOS, LVTTL, SSTL, HSTL, and GTL+ standards as specified in Xilinx DS112.

Does XC4VLX40-11FFG668C include built-in configuration memory?

No, XC4VLX40-11FFG668C does not include non-volatile configuration memory. It relies on external serial PROM (e.g., XCFxxP series) or master microprocessor for bitstream loading at power-up. Configuration occurs via Slave Serial, SelectMAP, or JTAG modes, with bitstream integrity verified through CRC checking during startup.

What thermal management guidance applies to XC4VLX40-11FFG668C in the FFG668 package?

XC4VLX40-11FFG668C requires a minimum of 16 thermal vias under the central thermal pad, filled and capped per IPC-7095. Board layout must maintain ≥25 mm² copper area on inner layers connected to the thermal pad. Junction-to-board thermal resistance is 12.5°C/W; maximum junction temperature is 100°C under industrial ambient conditions.

Can XC4VLX40-11FFG668C implement PCI Express endpoints?

XC4VLX40-11FFG668C supports PCI Express Gen1 (2.5 Gbps) endpoints using its RocketIO transceivers and accompanying LogiCORE IP. It does not include a hard PCIe block; implementation requires soft IP and careful timing closure. Xilinx UG195 documents reference designs achieving compliant x1 and x4 link training with this device.

Is partial reconfiguration supported on XC4VLX40-11FFG668C?

Yes, XC4VLX40-11FFG668C supports partial reconfiguration through the Xilinx ISE 14.7 toolflow using modular design methodology. Reconfigurable partitions must be constrained to specific CLB columns, and bitstream generation requires .rdc files. Verified use cases include dynamic filter coefficient updates and protocol mode switching without system reset.