随笔分类 -  FPGA

等占空比分频器的几种写法
摘要：转自http://www.cnblogs.com/yuphone/archive/2010/02/08/1666130.html 1 偶数分频 （1）2的幂分频 案例I 二分频 i： div_2.v module div_2( input i_clk, input i_rst_n, output o 阅读全文

posted @ 2017-04-05 11:35 kakegaenonai 阅读(1490) 评论(0) 推荐(0)

Spartan-6 FPGA SelectIO Resources User Guide 笔记4 I/O Pins Note for PCB
摘要：All VCCO pins on the FPGA must be connected, even if a bank is unused.the HSWAPEN pin must be either connected directly to GND, or forcedLow by anothe... 阅读全文

posted @ 2015-07-17 17:08 kakegaenonai 阅读(362) 评论(0) 推荐(0)

Spartan-6 FPGA SelectIO Resources User Guide 笔记3 Supply Voltages for the IOBs
摘要：1.The VCCO supplies, one for each of the I/O banks2.VCCINT is the main power supply for the internal FPGA logic3.VCCAUX is an auxiliary（辅助） source of ... 阅读全文

posted @ 2015-07-17 16:51 kakegaenonai 阅读(436) 评论(0) 推荐(0)

Spartan-6 FPGA SelectIO Resources User Guide 笔记2 SelectIO Attributes/Constraints
摘要：1.Location Constraint 用于分配I/O端口NET LOC = "";Example:NET MY_IO LOC=R7;2.IOSTANDARD Attribute 用于选择IO标准如LVCMOS25，LVDS_25等NET IOSTANDARD=””;3.Output Sl... 阅读全文

posted @ 2015-07-17 16:37 kakegaenonai 阅读(503) 评论(0) 推荐(0)

Spartan-6 FPGA SelectIO Resources User Guide 笔记1 可配置的阻抗
摘要：1.SPARTAN-6支持的LVDS电平标准3.3或者是2.5。2.可编程的差分阻抗 NET DIFF_TERM = "";3.可编程的输出终端电阻OUT_TERM = UNTUNED_可编程的输入终端电阻IN_TERM = UNTUNED_SPLIT_Only NONE (default)... 阅读全文

posted @ 2015-07-17 15:55 kakegaenonai 阅读(849) 评论(0) 推荐(0)

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