AMD XC3S1000-4FG320C

Overview

XC3S1000-4FG320C from AMD (formerly Xilinx) is a Spartan-3 FPGA with 1,000,000 system gates, 17,280 logic cells, and 576 Kbits of block RAM. It features a 320-pin Fine-Pitch Ball Grid Array (FBGA) package, operates at -4 speed grade (t_PD = 4.6 ns), and supports 3.3V/2.5V I/O with SelectIO™ technology. It is used in industrial control logic and reconfigurable digital signal processing subsystems.

For engineers reviewing the XC3S1000-4FG320C datasheet, pinout, applications, or equivalent options, key selection considerations include logic density, I/O voltage flexibility, embedded RAM capacity, and timing performance for synchronous state-machine implementation.

Technical Context

The XC3S1000-4FG320C implements a hierarchical FPGA architecture with configurable logic blocks (CLBs), distributed RAM, and dedicated carry logic. It integrates twelve 18×18 multipliers and supports DDR SDRAM interfaces up to 200 MHz.

Configuration is performed via Master Serial mode using external PROM or JTAG boundary-scan. The device supports IEEE 1149.1 compliance and includes internal oscillator for startup clock generation.

Key Specifications

Pinout & Package

XC3S1000-4FG320C is housed in a 320-pin Fine-Pitch Ball Grid Array (FBGA) package with 26 × 26 array, 1.0 mm ball pitch, and 15 mm × 15 mm body size. Thermal pad on underside requires solder paste stencil design per Xilinx UG331.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC3S1000-4FG320C, the XC3S1500-4FG320C offers headroom for future feature expansion, while the XC3S500E-4FG320C reduces active power by ~35% at equivalent clock rates-enabling longer runtime in portable instrumentation.

Availability

XC3S1000-4FG320C is available at Aetrix Electronics and suitable for industrial automation, video processing, and PCI interface design requiring stable component supply and long-term obsolescence management.

Supply support for XC3S1000-4FG320C 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 continues development and support of the Spartan family for cost-sensitive, high-volume programmable logic applications.

The Spartan-3 series was designed for mainstream embedded control and interface bridging where logic density, I/O flexibility, and predictable timing outweigh advanced features like DSP slices or high-speed transceivers.

FAQ

What is the maximum operating frequency of the XC3S1000-4FG320C?

The XC3S1000-4FG320C has a -4 speed grade specifying a maximum I/O-to-output delay of 4.6 ns. Achievable system clock frequencies depend on design topology, but synchronous logic paths routinely reach 150–200 MHz in well-constrained implementations. The internal oscillator runs at approximately 4 MHz and is not intended for user logic clocks.

Does the XC3S1000-4FG320C support partial reconfiguration?

No, the XC3S1000-4FG320C does not support partial reconfiguration. That capability was introduced in later families such as Spartan-6 and 7-series. The XC3S1000-4FG320C supports full configuration reload via PROGRAM_B or JTAG, but all logic and routing resources are reset during reconfiguration.

What configuration modes are supported by the XC3S1000-4FG320C?

The XC3S1000-4FG320C supports Master Serial, Slave Serial, Slave Parallel, and JTAG configuration modes. Master Serial is most common, using an external PROM (e.g., XCF02S) to load the bitstream automatically on power-up. JTAG is used for debugging, programming, and boundary-scan testing.

Can the XC3S1000-4FG320C interface directly with DDR SDRAM?

Yes, the XC3S1000-4FG320C supports DDR SDRAM interfaces up to 200 MHz using its SelectIO™ I/O standard and source-synchronous timing constraints. External PHY logic must be implemented in the FPGA fabric, as no dedicated DDR controller is embedded. Xilinx UG331 documents timing closure requirements for reliable operation.

Is the XC3S1000-4FG320C RoHS compliant?

Yes, the XC3S1000-4FG320C is RoHS compliant and lead-free. The "C" suffix denotes commercial temperature range (0°C to +85°C) and RoHS-compliant packaging. Xilinx documentation confirms Pb-free FBGA construction and halogen-free substrate materials per JEDEC J-STD-609A.