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Cyclone™ FPGA具有锁相环(PLL)和全局时钟网络,提供完整的时钟管理方案。Cyclone PLL具有时钟倍频和分频、相位偏移、可编程占空比和外部时钟输出,进行系统级的时钟管理和偏移控制。Altera® Quartus® II软件无需任何外部器件,就可以启用Cyclone PLL和相关功能。本文将介绍如何设计和使用Cyclone PLL功能。
PLL常用于同步内部器件时钟和外部时钟,使内部工作的时钟频率比外部时钟更高,时钟延迟和时钟偏移最小,减小或调整时钟
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verilog 三分频 分频器是FPGA设计中使用频率非常高的基本设计之一,尽管在目前大部分设计中,广泛使用芯片厂家集成的锁相环资源,如altera 的PLL,Xilinx的DLL.来进行时钟的分频,倍频以及相移。-verilog-third of the frequency divider is a FPGA design, very high frequency of use, one of the basic design, although most of the designs in
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DPLL由 鉴相器、 模K加减计数器、脉冲加减电路、同步建立侦察电路、模N分频器构成.
整个系统的中心频率(即signal_in和signal_out的码速率的2倍)为clk/8/N. 模K加减计数器的K值决定DPLL的精度和同步建立时间,K越大,则同步建立时间长,同步精度高.反之则短,低.
-DPLL by the phase detector, K addition and subtraction counter mode, pulse subtraction circuit, sy
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数字锁相环频率合成器的设计,鉴相器、环路滤波器、数控振荡器、反馈分频器-Digital PLL frequency synthesizer, phase detector, loop filter, NCO, feedback divider
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数字锁相环频率合成器的设计,数字鉴相器,数字滤波器,数控振荡器,反馈分频器-Digital PLL frequency synthesizer, digital phase detector, digital filter, digital control oscillator, the feedback divider
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用verilog语言制作一个PLL,这个PLL可以将频率除频到12MHZ,将PLL除频成12MHZ输出-Verilog language production with a PLL, the PLL frequency divider can be to 12MHZ, 12MHZ into the PLL output divider
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The Slow Peripherals Clock Group includes the McBSPs, I2C, and the UART. The input clock to this clock
group is taken the output of divider 2 (D2). by default, the divider is set to divide its input clock by
four, but the divide value can be chan
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用VHDL语言编写实现以下功能:用PLL,复位器,分频器,同步时钟,计数器来产生正弦波,再在其上加扰,用FIR滤波器进行滤波整形,最后得到输出。-Using VHDL language to achieve the following functions: PLL, reset, clock synchronization, frequency divider, counter to generate sine wave, and then scrambling on the filter sh
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一种设计数字锁相环的思路,包含异或鉴相器、k模可逆计数器、脉冲加减计数器、N分频器等,实现相位的锁定。(A design of digital phase locked loop (PLL) consists of a phase discriminator, a K mode reversible counter, a pulse addition and subtraction counter, a N frequency divider and so on, to lock the pha
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