Xilinx公司的 Virtex-5 FPGA系列采用第二代ASMBL™架构，是功能最为强大的FPGA器件，包括LX, LXT, SXT和 FXT四个平台，主要用于通信和数据通信，存储设备以及服务器，工业设备。本文介绍了Virtex-5 四种平台的主要性能以及ML550 网络接口开发板的主要性能和电路图。
The Virtex™-5 family provides the newest most powerful features in the FPGA market. Using the second generation ASMBL™ (Advanced Silicon Modular Block) column-based architecture, the Virtex-5 family contains four distinct platforms (sub-families), the most choice offered by any FPGA family. Each platform contains a different ratio of features to address the needs of a wide variety of advanced logic designs. This overview contains detailed information about the LX, LXT, and SXT platforms. In addition to the most advanced, high-performance logic fabric, Virtex-5 FPGAs contain many hard-IP system level blocks, including powerful 36-Kbit block RAM/FIFOs, second generation 25 x 18 DSP slices, SelectIO™ technology with built-in digitally-controlled impedance, ChipSync™ source-synchronous interface blocks, system monitor functionality, enhanced clock management tiles with integrated DCM (Digital Clock Managers) and phase-locked-loop (PLL) clock generators, and advanced configuration options. The LXT and SXT devices also contain power-optimized high-speed serial transceiver blocks for enhanced serial connectivity, a PCI Express™ compliant integrated Endpoint block, and tri-mode Ethernet MACs (Media Access Controllers). These features allow advanced logic designers to build the highest levels of performance and functionality into their FPGA-based systems. Built on a 65-nm state-of-the-art copper process technology, Virtex-5 FPGAs are a programmable alternative to custom ASIC technology. Most advanced system designs require the programmable strength of FPGAs. Virtex-5 FPGAs offer the best solution for addressing the needs of high-performance logic designers, high-performance DSP designers, and high-performance embedded systems designers with unprecedented logic, DSP, hard/soft microprocessor, and connectivity capabilities. The Virtex-5 LXT, SXT, and FXT platforms include advanced high-speed serial connectivity and link/transaction layer capability.
Virtex-5 主要特性：
Four platforms LX, LXT, SXT, and FXT
Virtex-5 LX: High-performance general logic applications
Virtex-5 LXT: High-performance logic with advanced serial connectivity
Virtex-5 SXT: High-performance signal processing applications
Virtex-5 FXT: High-performance embedded systems
Cross-platform compatibility
LXT, SXT, and FXT devices are footprint compatible in the same package using adjustable voltage regulators
Most advanced, high-performance, optimal-utilization, FPGA fabric - Real 6-input look-up table (LUT) technology
Dual 5-LUT option
Improved reduced-hop routing
64-bit distributed RAM option
SRL32/Dual SRL16 option
Powerful clock management tile (CMT) clocking
Digital Clock Manager (DCM) blocks for zero delay buffering, frequency synthesis, and clock phase shifting
PLL blocks for input jitter filtering, zero delay buffering, frequency synthesis, and phase-matched clock division
36-Kbit block RAM/FIFOs
True dual-port RAM blocks
Enhanced optional programmable FIFO logic
Programmable • True dual-port widths up to x36 • Simple dual-port widths up to x72
Built-in optional error-correction circuitry
Optionally program each block as two independent 18-Kbit blocks
65-nm copper CMOS process technology
1.0V core voltage
High signal-integrity flip-chip packaging available in standard or Pb-free package options
High-performance parallel SelectIO technology
1.2 to 3.3V I/O Operation
Source-synchronous interfacing using ChipSync technology
Digitally-controlled impedance (DCI) active termination
Flexible fine-grained I/O banking
High-speed memory interface support
Advanced DSP48E slices
25 x 18, two’s complement, multiplication
Optional adder, subtracter, and accumulator
Optional pipelining
Optional bitwise logical functionality
Dedicated cascade connections
Flexible configuration options
SPI and Parallel FLASH interface
Multi-bitstream support with dedicated fallback reconfiguration logic
Auto bus width detection capability
Integrated Endpoint blocks for PCI Express (LXT/SXT)
Compliant with the PCI Express Base Specification 1.1
x1, x2, x4, or x8 lane support per block
Works in conjunction with RocketIO™ transceivers
Tri-mode 10/100/1000 Mb/s Ethernet MACs (LXT/SXT)
RocketIO transceivers can be used as PHY or connect to external PHY using many soft MII (Media Independent Interface) options
RocketIO GTP transceivers 100 Mb/s to 3.75 Gb/s (LXT/SXT)
System Monitoring capability on all devices
On-chip/Off-chip thermal monitoring
On-chip/Off-chip power supply monitoring
JTAG access to all monitored quantities
下表为Virtex-5 FPGA系列的器件型号：
Virtex-5 ML550 网络接口开发板
Virtex-5 ML550 Networking Interfaces Development Board
The Xilinx ML550 platform is ideal for development and evaluation of networking and source synchronous interfaces using Virtex™-5 LXT FPGA family. It is also the preferred platform for analyzing and demonstrating the power consumption characteristics of Virtex-5 devices.
开发板包括：
XC5VLX50T-FFG1136 FPGA
64M x 8 DDR SDRAM memory
Eight clock sources:
200 MHz, 250 MHz, 133 MHz, and 33 MHz on-board oscillators
Two ICS8442 clock synthesizer devices
Two sets of SMA differential clock input connectors
One USB “B” port
One 64 x 128 pixel LCD – Optional
A System ACE CompactFlash (CF) Configuration Controller that allows storing
and downloading of up to eight FPGA configuration image files
Six Samtec LVDS connectors (a total of 53 differential input and 53 differential output
channels)
Onboard power regulators with ±5% output margin test capabilities, in 2.5% increments
开发板主要性能：
Xilinx Device: XC5VLX50T-FFG1136 FPGA
64M x 8 DDR SDRAM memory
Eight clock sources:
200 MHz, 250 MHz, 133 MHz, and 33 MHz on-board oscillators
Two ICS8442 clock synthesizer devices
One USB “B” port
One 64 x 128 pixel LCD
A System ACE™ CompactFlash (CF) Configuration Controller that allows storing
Six Samtec LVDS connectors (a total of 53 differential input and 53 differential output
Onboard power regulators with ±5% output margin test capabilities, in 2.5%
Power monitor connector for detailed current measurements on Vccint, Vccaux, and Vcco supplies
目标应用：
Telecom / Datacom
Storage
Servers
Industrial
Virtex-5 ML550网络接口开发板外形图
Virtex-5 ML550网络接口开发板电路图。
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