Clocking

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Complete Clock Management for Complex Timing

The Virtex™-5 FPGA Family offers the Clock Management Tile (CMT) block to address complex clock requirements and domains through:

  • Two digital clock manager (DCM) blocks for precise clock synthesis and delay control.
  • One phase-locked loop (PLL) for low-jitter clock generation and jitter filtering.
Clocking
Table 1: Virtex-5 Clocking Feature Benefits
Feature Benefit
550 MHz Performance Extract maximum through-put from logic fabric and hard IP

Up to 6 Clock Management Tiles (CMT)

  • Up to 12 DCMs
  • Up to 6 PLLs
Provide a flexible high performance clock management solution
Clock Deskew Provide zero propagation delay between source clock and output clock, low clock skew among output clock signals, and advanced clock domain control
Frequency Synthesis Easily multiply or divide clock frequencies, or create custom-synthesized M/D frequencies
Phase Shifting Achieve your exact phase requirements with coarse and fine-grain phase shifting
Dynamic Reconfiguration Change DCM attributes without reconfiguring the rest of the device

Flexible DCM-to-PLL or PLL-to-DCM cascade

Optimize low-jitter clock generation
Jitter Filtering Reduce clock jitter by 50% or more

Abundant Clock Resources

  • 20 clock inputs (differential or single-ended)
  • 32 matched-skew global clock networks
  • 4 I/O clock nets and 4 Regional clock nets per clock region
  • 8-24 distinct clock regions
Ensure clock alignment and overall system level timing for large designs. Include and manage multiple time domains in a single device. Simplify source-synchronous interfaces with I/O clocks and regional clocks
 
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