Introduction
In the rapidly evolving world of digital electronics design, programmable logic devices have become essential components for engineers seeking flexibility, performance, and efficiency. The XC2C128C6-BMS, a development board and evaluation kit based on Xilinx’s acclaimed CoolRunner-II CPLD (Complex Programmable Logic Device) family, represents a powerful tool for designers who need to prototype and test digital circuits quickly. This article explores the features, capabilities, applications, and performance aspects of the XC2C128C6-BMS platform, offering insights into how this versatile development tool can enhance the electronic design process.
Understanding the XC2C128C6-BMS
The XC2C128C6-BMS is an evaluation and development board built around the XC2C128 CPLD from Xilinx’s CoolRunner-II family. The name breaks down as follows:
- XC2C128: Designates the 128-macrocell CoolRunner-II CPLD at the heart of the system
- C6: Indicates the speed grade (with pin-to-pin delays of approximately 5.7ns)
- BMS: Refers to the board/starter kit configuration
This development platform provides engineers with a complete environment for exploring the capabilities of the XC2C128 CPLD while simplifying the prototyping process for complex digital designs.
Core Components and Architecture
At the center of the XC2C128C6-BMS is the XC2C128 CPLD chip, which features:
- 128 macrocells organized into 8 function blocks
- Advanced Interconnect Matrix (AIM) providing efficient signal routing
- 3,000 system gates equivalent
- 100 user I/O pins for extensive connectivity
- Low power consumption architecture
- 0.18-micron CMOS technology
- Support for multiple voltage standards
The CPLD core features eight function blocks interconnected by a low-power Advanced Interconnect Matrix. Each function block receives 40 true and complement inputs and contains a 40 by 56 P-term PLA and 16 macrocells with numerous configuration options that allow for both combinational and registered modes of operation.
Development Board Features
The XC2C128C6-BMS development board enhances the capabilities of the base CPLD by providing:
- Comprehensive I/O Options: The board includes various connectors and interfaces that make the CPLD pins accessible for external connections, enabling rapid prototyping of designs.
- Programming Interface: Built-in JTAG programming circuitry that supports IEEE Standard 1149.1/1532 for convenient programming, debugging, and testing.
- Power Management: On-board power regulation circuitry that supports the CPLD’s low-power operation while providing stable supply voltages.
- Clock Generation: Configurable oscillator and clock distribution networks for timing-critical applications.
- Expansion Capabilities: Headers and connectors that allow integration with other systems and additional hardware.
Advanced Features of the CoolRunner-II Architecture
The XC2C128 CPLD at the heart of the XC2C128C6-BMS includes several advanced features that enhance its versatility:
DataGATE Technology
This innovative power-saving feature allows selective disabling of inputs that aren’t needed during certain operations. By mapping a signal to the DataGATE function, power consumption is reduced through minimized signal switching, making the device ideal for battery-powered applications.
CoolCLOCK Technology
The combination of the DualEDGE flip-flop feature and clock division capabilities creates the CoolCLOCK feature. This allows high-performance synchronous operation based on lower frequency clocking, helping to reduce the total power consumption of the device. The system includes circuitry to divide one externally supplied global clock (GCK2) by eight different selections, yielding even and odd clock frequencies.
Flexible I/O Banking
The device features two I/O banks that support multiple voltage standards, allowing easy interfacing with 3.3V, 2.5V, 1.8V, and 1.5V devices. This flexibility eliminates the need for level-shifting components in many designs, simplifying the overall system architecture.
Instant-On Capability
Unlike many FPGAs that require configuration upon power-up, the XC2C128 CPLD is immediately operational when powered. This instant-on capability is critical for applications that cannot tolerate startup delays.
Development Environment and Tools
The XC2C128C6-BMS is supported by Xilinx’s comprehensive development ecosystem:
- ISE WebPACK: This free design software supports the entire development process, from HDL coding to synthesis, implementation, and device programming.
- Vivado Design Suite: For newer applications, this modern integrated design environment provides advanced capabilities for CPLD development.
- JTAG Programming Tools: The board supports industry-standard JTAG programming interfaces, making it compatible with various programming solutions.
Applications and Use Cases
The XC2C128C6-BMS finds applications across numerous domains:
Educational Settings
The board serves as an excellent teaching platform for digital logic design, VHDL/Verilog programming, and programmable logic concepts, giving students hands-on experience with industry-standard tools and devices.
Prototyping and Development
Engineers use the XC2C128C6-BMS to quickly prototype and validate designs before committing to custom hardware, saving time and resources in the development process.
Interface Bridging
The board excels at implementing protocol bridges and interface adapters, leveraging the CPLD’s flexibility to connect systems with incompatible electrical or logical interfaces.
Signal Processing
Simple signal processing applications, state machines, and control systems can be implemented on the board, taking advantage of the CPLD’s deterministic timing characteristics.
Low-Power Applications
The CoolRunner-II’s exceptional power efficiency makes the XC2C128C6-BMS ideal for developing battery-powered devices and energy-sensitive applications.
Performance Evaluation and Ranking
When evaluating the XC2C128C6-BMS against similar CPLD development platforms, several key factors come into play:
Speed Performance: 8/10
With pin-to-pin delays of approximately 5.7ns, the XC2C128 delivers solid performance for most applications. While not the absolute fastest in its class, it provides a good balance between speed and power consumption.
Logic Capacity: 7/10
The 128 macrocells offer a mid-range capacity suitable for moderately complex designs. Larger CPLDs like the XC2C256 provide more resources but at higher cost and power consumption.
Power Efficiency: 9/10
The CoolRunner-II architecture excels in power efficiency, with innovations like DataGATE and CoolCLOCK helping to minimize consumption in both active and standby modes. This makes the XC2C128C6-BMS one of the most power-efficient platforms in its class.
Development Ecosystem: 8/10
Xilinx’s mature development tools provide a robust environment, though newer platforms might offer more modern interfaces. The extensive documentation and community support enhance the platform’s usability.
Versatility: 8/10
The flexible I/O banking, varied package options, and compatibility with multiple voltage standards make this a highly versatile development platform suitable for diverse applications.
Cost-Effectiveness: 7/10
While not the least expensive option, the combination of features, performance, and support makes the XC2C128C6-BMS a good value for professional and educational uses.
Overall Rating: 7.8/10
The XC2C128C6-BMS strikes an excellent balance between performance, power efficiency, and cost, making it a solid choice for many digital design applications. While newer development platforms may offer additional features, the solid architecture, mature toolchain, and reliability of this platform continue to make it relevant for modern design challenges.
Conclusion
The XC2C128C6-BMS development board represents a powerful tool for digital designers seeking a flexible, efficient platform for prototyping and development. By combining the versatile XC2C128 CPLD with an accessible development environment, this evaluation kit helps engineers bridge the gap between concept and implementation.
For educators, students, hobbyists, and professional engineers alike, the XC2C128C6-BMS offers a well-rounded introduction to programmable logic technology while providing the resources needed for substantial real-world applications. As digital systems continue to evolve, platforms like the XC2C128C6-BMS remain valuable assets in the designer’s toolkit, enabling innovation and experimentation in an increasingly complex technological landscape.
