AMD XCS30-3BG256C

Overview

XCS30-3BG256C from AMD (formerly Xilinx) is a Spartan-3 FPGA with 30,000 system gates, 216 I/O pins, and configured in a 256-pin BGA package (Fine-Pitch Ball Grid Array, 1.0 mm pitch). It operates at -3 speed grade (tPD = 3.8 ns), supports 3.3V/2.5V/1.8V I/O standards, and targets low-cost embedded control and interface bridging applications.

For engineers reviewing the XCS30-3BG256C datasheet, pinout, applications, or equivalent options, key selection criteria include logic density, I/O voltage flexibility, timing closure feasibility at -3 speed grade, and availability of legacy configuration support (Master Serial, JTAG).

Technical Context

The XCS30-3BG256C implements a hierarchical CLB-based architecture with configurable logic blocks containing dual 4-input LUTs and flip-flops. It integrates dedicated carry logic for arithmetic functions and distributed RAM (16-bit wide × 32 deep per CLB). Configuration is performed via external PROM or processor-controlled serial mode.

It supports SelectI/O standards including LVTTL, LVCMOS, PCI, and HSTL Class I on banked I/Os, with programmable slew rate and drive strength per pin group. Internal global clock networks distribute up to four primary clocks with low skew.

Key Specifications

Pinout & Package

256-ball Fine-Pitch Ball Grid Array (FBGA) package with 1.0 mm ball pitch, 17 × 17 array, and thermal pad exposed on underside. Pinout defined per Xilinx DS099 (Spartan-3 Data Sheet), Revision 2.2, Table 10.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar FPGA-based interface and control applications.

Compared with XCS30-3BG256C, the PQFP alternatives offer easier prototyping and rework but sacrifice 40 I/Os, thermal performance, and banked I/O voltage flexibility - critical for multi-standard interface consolidation.

Availability

XCS30-3BG256C is available at Aetrix Electronics and suitable for industrial control, legacy system integration, and test equipment applications requiring stable component supply and long-term obsolescence management.

Supply support for XCS30-3BG256C 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, inheriting its FPGA portfolio including the Spartan family. AMD focuses on adaptive computing solutions for data center, AI, and embedded markets.

The Spartan-3 family, including XCS30-3BG256C, was designed for cost-sensitive, high-volume applications requiring moderate logic density and flexible I/O interfacing - especially in industrial automation and communications infrastructure.

FAQ

What is the maximum operating frequency for internal logic in XCS30-3BG256C?

The XCS30-3BG256C has a -3 speed grade specifying a worst-case CLB-to-CLB propagation delay (tPD) of 3.8 ns. This translates to a theoretical maximum internal logic frequency of approximately 263 MHz under ideal routing and fanout conditions. Actual achievable clock rates depend on design topology, place-and-route results, and I/O timing constraints. The XCS30-3BG256C datasheet provides detailed timing models for specific path types.

Does XCS30-3BG256C support JTAG boundary-scan testing?

Yes, XCS30-3BG256C fully supports IEEE 1149.1 JTAG boundary-scan testing. Pins TCK, TMS, TDI, and TDO are dedicated for this function and appear in the official pinout table. The device implements a 4-bit instruction register and supports SAMPLE/PRELOAD, EXTEST, and BYPASS instructions. JTAG is used both for programming and for interconnect testing during board manufacturing.

Can XCS30-3BG256C operate with mixed I/O voltage standards on different banks?

Yes, XCS30-3BG256C supports mixed I/O voltage standards across separate I/O banks. Each bank has an independent VCCO supply (1.8V, 2.5V, or 3.3V), allowing simultaneous use of LVTTL, LVCMOS, and PCI signaling on different pins. Bank 0 and Bank 1 are independently configurable. This capability is documented in the XCS30-3BG256C DC and Switching Characteristics tables and is essential for bridging heterogeneous interfaces.

What configuration methods are supported by XCS30-3BG256C?

XCS30-3BG256C supports Master Serial (via on-board PROM), Slave Serial (controlled by external processor), and JTAG modes. Configuration bitstream is loaded into SRAM-based CLBs on power-up. JTAG is used for both programming and debugging. No internal non-volatile storage is present - configuration must be reloaded after each power cycle unless external PROM is used.

Is thermal management required for XCS30-3BG256C in continuous operation?

Yes, thermal management is recommended for XCS30-3BG256C in continuous operation. The 256-ball FBGA package includes an exposed thermal pad on the underside. Xilinx DS099 specifies a maximum junction temperature of 85°C and recommends using solder paste and vias under the thermal pad to transfer heat to inner ground planes. Without proper thermal relief, power dissipation above 1.2 W may exceed safe operating limits depending on ambient conditions.