AMD XCS40XL-4BG256C

Overview

XCS40XL-4BG256C from AMD (formerly Xilinx) is a Spartan-XL family FPGA with 40,000 system gates, 256-ball BGA package, 4.5 ns CLB delay, and support for 3.3 V I/O operation. It serves as a reconfigurable logic fabric in industrial control logic, digital signal preprocessing, and embedded interface bridging.

For engineers reviewing the XCS40XL-4BG256C datasheet, pinout, applications, or equivalent options, key selection factors include CLB count, I/O voltage compatibility, configuration mode support (Master Serial, Slave Parallel), and guaranteed timing performance at -4 speed grade.

Technical Context

The XCS40XL-4BG256C implements a hierarchical architecture with Configurable Logic Blocks (CLBs), Input/Output Blocks (IOBs), and interconnect resources. It supports IEEE 1149.1 JTAG boundary-scan testing and uses internal SRAM-based configuration memory loaded via serial PROM or microprocessor interface.

Configuration occurs on power-up using external PROM or through JTAG port; no internal non-volatile memory is present. The device operates within commercial temperature range (0°C to 70°C) and requires separate 3.3 V supply for I/O banks and 3.3 V core voltage.

Key Specifications

Pinout & Package

256-ball fine-pitch BGA (FBGA) package with 17×17 array, 1.27 mm ball pitch, and standard JEDEC MO-205AC mechanical outline. Thermal pad exposed on underside for enhanced heat dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar FPGA logic implementation applications.

Compared with XCS40XL-4BG256C, the -3 variant trades speed for cost in timing-relaxed designs, while the XCS50XL-4BG256C retains identical timing and packaging but adds 10K extra gates-enabling more complex control logic without PCB redesign.

Availability

XCS40XL-4BG256C is available at Aetrix Electronics and suitable for industrial motion control, digital communication interface bridging, and embedded video preprocessing requiring stable component supply and long-term manufacturing continuity.

Supply support for XCS40XL-4BG256C 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, integrating programmable logic technology into its adaptive computing portfolio. Xilinx pioneered SRAM-based FPGAs for high-performance reconfigurable systems.

The Spartan-XL family was designed for cost-sensitive, high-volume embedded applications requiring reliable reprogrammable logic with commercial temperature support and 3.3 V I/O compatibility.

FAQ

What is the configuration method supported by the XCS40XL-4BG256C?

The XCS40XL-4BG256C supports Master Serial, Slave Parallel, and IEEE 1149.1 JTAG configuration modes. Master Serial uses an external serial PROM; Slave Parallel allows microprocessor-controlled loading; JTAG enables boundary-scan testing and in-system programming. All methods initialize the internal SRAM configuration memory on power-up or PROGRAM_B assertion.

Does the XCS40XL-4BG256C have internal non-volatile configuration memory?

No, the XCS40XL-4BG256C relies on external configuration sources. It contains no internal flash or EEPROM. Configuration data is loaded into volatile SRAM each time power is applied or after a PROGRAM_B reset. Persistent storage requires an external serial PROM or host processor intervention.

What is the significance of the "-4" speed grade in XCS40XL-4BG256C?

The "-4" speed grade in XCS40XL-4BG256C specifies a maximum CLB propagation delay of 4.5 ns under worst-case commercial temperature and voltage conditions. This rating guarantees timing closure for synchronous logic operating up to approximately 100 MHz, enabling deterministic real-time control in industrial and instrumentation applications.

Can the XCS40XL-4BG256C operate with mixed I/O voltages?

No, the XCS40XL-4BG256C supports only 3.3 V I/O operation across all banks. It lacks multi-voltage I/O capability or bank-specific voltage selection. All VCCO pins must be supplied with 3.3 V, and interfacing with 5 V or 1.8 V systems requires external level-shifting circuitry.

Is the XCS40XL-4BG256C pin-compatible with other Spartan-XL devices in the same package?

Yes, all Spartan-XL devices in the 256-ball BGA package-including XCS30XL, XCS40XL, and XCS50XL variants-share identical pinouts. This allows direct substitution based on logic density needs without PCB layout changes, provided power delivery and thermal design accommodate the specific device's current draw.