2. 技术支持
  3. AR# 9435: 9.1i FPGA Editor - FPGA_EDITOR reports one of the Virtex-E CLKDLL outputs as "CLK2x90". (It should be CLK2X180.)

AR# 9435

9.1i FPGA Editor - FPGA_EDITOR reports one of the Virtex-E CLKDLL outputs as "CLK2x90". (It should be CLK2X180.)

描述

FPGA Editor reports one of the Virtex-E DLL outputs as CLK2X90; however, this output pin should be CLK2X180.

解决方案

This is an error in FPGA Editor. When the CLK2X180 symbol is used as an output of a CLKDLLE primitive, FPGA Editor will report that the output is called "CLK2X90." This is a visual problem only; the output is not CLK2X90 (90 degrees of phase shift), but is, in fact, CLK2X180 (180 degrees of phase shift).

AR# 9435
日期 05/14/2014
状态 Archive
Type 综合文章