Product Overview: XC2S400E-7FG456C FPGA Specifications
The XC2S400E-7FG456C is a professional-grade Field-Programmable Gate Array (FPGA) from Xilinx’s Spartan-IIE family, engineered for demanding digital signal processing and telecommunications applications. This powerful programmable logic device delivers 400,000 system gates in a compact 456-pin Fine-pitch Ball Grid Array (FBGA) package, making it an ideal solution for space-constrained, high-performance designs.
As part of the renowned Xilinx FPGA product line, the XC2S400E-7FG456C represents second-generation ASIC replacement technology, offering unlimited reprogrammability and cost-effective performance for complex digital applications.
Key Technical Specifications
Core Performance Features
| Specification |
Value |
Details |
| System Gates |
400,000 gates |
High-density logic capacity for complex designs |
| Logic Cells |
10,800 cells |
Adequate resources for sophisticated applications |
| Maximum Frequency |
400 MHz |
Speed grade -7 for demanding timing requirements |
| Process Technology |
0.15μm |
Cost-effective advanced manufacturing process |
| Operating Voltage |
1.8V |
Low-power operation for energy-efficient designs |
| Package Type |
456-pin FBGA |
Compact form factor with fine-pitch ball grid array |
| Temperature Range |
Commercial grade |
Suitable for standard operating environments |
Memory Architecture
| Memory Type |
Capacity |
Application |
| Block RAM |
Up to 288 Kbits |
Ideal for data buffering and storage |
| Distributed RAM |
Up to 221,184 bits |
Flexible LUT-based memory (16 bits/LUT) |
| Block RAM Columns |
4 columns |
Efficient memory distribution across die |
Advanced FPGA Features and Capabilities
Programmable Logic Architecture
The XC2S400E-7FG456C incorporates streamlined features based on the proven Virtex-E FPGA architecture, delivering exceptional performance for digital signal processing tasks. The device includes:
- Configurable Logic Blocks (CLBs): High-density array for complex logic implementation
- Input/Output Blocks (IOBs): Support for 19 selectable I/O standards
- Delay-Locked Loops (DLLs): Four DLLs positioned at each corner for precise clock management
- VersaRing Routing: Advanced routing architecture facilitating pin-swapping and pin-locking
Clock Management System
| Feature |
Specification |
Benefit |
| DLL Count |
4 units |
One at each corner of the die |
| Clock Distribution |
Primary global nets |
Low-skew clock delivery throughout device |
| Clock Mirror Function |
Supported |
Off-chip clock synchronization capability |
XC2S400E-7FG456C Applications and Use Cases
Digital Signal Processing Systems
This Spartan-IIE FPGA excels in high-performance digital signal processing applications requiring complex logic and fast data processing. The 400 MHz maximum frequency and substantial gate count enable real-time signal manipulation and analysis.
Telecommunications and Networking
With its 7ns maximum pin-to-pin data propagation, the XC2S400E-7FG456C ensures reliable, high-speed communication in demanding telecommunications environments. The device supports various communication protocols through its flexible I/O configuration.
Industrial Control and Automation
The unlimited reprogrammability feature allows for field upgrades without hardware replacement, making this FPGA ideal for industrial control systems that require periodic updates or customization.
Embedded Systems Development
The compact 456-pin FBGA package provides an excellent solution for embedded applications where board space is at a premium while maintaining robust processing capabilities.
Configuration and Programming Options
Multiple Configuration Modes
| Mode |
Description |
Application |
| Master Serial |
Self-configuring from external PROM |
Standalone operation |
| Slave Serial |
Configuration from external controller |
System integration |
| Slave Parallel |
Faster parallel configuration |
Quick boot requirements |
| Boundary Scan (JTAG) |
Standard JTAG programming |
Development and testing |
Platform Flash Support
The XC2S400E-7FG456C supports Xilinx Platform Flash in-system programmable configuration PROMs, offering low-cost, reliable configuration storage solutions for production designs.
Performance Advantages Over ASICs
Cost-Effective Development
Unlike traditional mask-programmed ASICs, the XC2S400E-7FG456C eliminates:
- High initial NRE (Non-Recurring Engineering) costs
- Lengthy development and fabrication cycles
- Risk of silicon bugs requiring expensive respins
- Long-term inventory commitments
Design Flexibility Benefits
| Advantage |
Impact |
Value Proposition |
| Unlimited Reprogramming |
No limit on configuration cycles |
Future-proof designs |
| Field Upgrades |
Update functionality post-deployment |
Reduced maintenance costs |
| Fast Iterations |
Quick design modifications |
Shorter time-to-market |
| Pin-Swapping |
VersaRing routing flexibility |
Easier PCB layout adaptation |
I/O Standards and Interface Capabilities
The XC2S400E-7FG456C supports 19 selectable I/O standards, providing exceptional flexibility for interfacing with various system components:
- LVTTL and LVCMOS voltage levels
- Differential signaling standards
- High-speed serial interfaces
- Legacy parallel bus protocols
This comprehensive I/O support ensures seamless integration with existing designs and compatibility with industry-standard communication protocols.
Package and Thermal Characteristics
FG456 Package Details
The 456-pin Fine-pitch Ball Grid Array (FBGA) package offers:
- Compact footprint for high-density PCB designs
- Excellent thermal performance through bottom-side heat dissipation
- Reliable ball-grid connections for manufacturing
- Compatible with standard PCB assembly processes
Power Management
Operating at 1.8V core voltage, the XC2S400E-7FG456C delivers optimal performance while maintaining power efficiency, crucial for battery-operated or thermally-constrained applications.
Development Tools and Design Support
Compatible Design Software
Engineers can design with the XC2S400E-7FG456C using Xilinx development tools, including:
- ISE Design Suite for FPGA implementation
- ChipScope Pro for in-system debugging
- PlanAhead for floorplanning and optimization
- XST (Xilinx Synthesis Technology) for logic synthesis
Reference Designs and Resources
Development is accelerated through access to:
- Comprehensive datasheets and user guides
- Application notes for common implementations
- Reference designs for standard interfaces
- Active community support forums
Quality and Reliability Standards
As a Xilinx-manufactured device, the XC2S400E-7FG456C adheres to strict quality standards:
- Automotive-grade testing procedures
- Extended temperature qualification
- Long-term reliability validation
- RoHS compliance options available
Ordering Information and Part Number Breakdown
Part Number: XC2S400E-7FG456C
- XC2S400E: Device family and gate count designation
- -7: Speed grade (400 MHz maximum frequency)
- FG456: Package type (456-pin Fine-pitch BGA)
- C: Commercial temperature range
Product Status and Lifecycle
Note: The Spartan-IIE family has been marked as not recommended for new designs. For current projects requiring similar capabilities, consider evaluating newer Xilinx FPGA families such as Spartan-7 or Artix-7 for enhanced features and ongoing support.
Comparison with Alternative Solutions
XC2S400E vs. Similar FPGAs
| Feature |
XC2S400E-7FG456C |
XC2V4000 (Virtex-II) |
Altera Cyclone IV |
| System Gates |
400,000 |
Higher density |
Comparable |
| Technology |
0.15μm |
Advanced |
Similar generation |
| Power |
1.8V |
Higher |
Comparable |
| Cost |
Low |
Medium-High |
Competitive |
Frequently Asked Questions
What is the maximum operating frequency?
The XC2S400E-7FG456C speed grade -7 supports maximum clock frequencies up to 400 MHz, with actual performance dependent on design complexity and routing.
Can this FPGA be reprogrammed?
Yes, the device features unlimited in-system reprogrammability, allowing configuration updates throughout the product lifecycle without hardware changes.
What memory resources are available?
The FPGA provides 288 Kbits of block RAM organized in four columns, plus 221,184 bits of distributed RAM for flexible memory implementation.
Is the device suitable for harsh environments?
The commercial-grade version operates within standard temperature ranges. For extended temperature or harsh environment applications, consult industrial-grade alternatives.
Conclusion: Why Choose XC2S400E-7FG456C
The XC2S400E-7FG456C represents a proven, cost-effective FPGA solution for digital signal processing, telecommunications, and embedded control applications. With its combination of 400,000 system gates, 400 MHz performance, comprehensive memory resources, and flexible I/O capabilities, this Spartan-IIE device delivers exceptional value for high-volume production designs.
While newer FPGA families offer enhanced features, the XC2S400E-7FG456C remains a viable option for legacy system support and cost-sensitive applications where its proven architecture and wide availability provide distinct advantages.
For the latest information on FPGA solutions and comprehensive design resources, explore the complete Xilinx FPGA portfolio to find the perfect programmable logic device for your next project.
