CDCM6208时钟配置

czs----Tronlong

Dear,

      CDCM6208配置时，VCO频率不能超出规定范围，VCO输出频率的范围要求：
2.39 GHz to 2.55 GHz (CDCM6208V1) and 2.94 GHz to 3.13 GHz (CDCM6208V2)
这个范围要求在CDCM6208的数据手册中是有说明的：



根据您提供的配置寄存器数值，计算出VCO输出频率为1600MHz，不在要求范围内，所以导致CDCM6208不能正常工作。

CDCM6208相关参考链接如下，希望能够帮到您：
https://www.cnblogs.com/zhangbing12304/p/10667970.html

czs----Tronlong

nylle 发表于 2019-12-25 13:51
请取消最佳答案，不是你所说的问题，我已经解决了。

您好，还需要确认一下您的工程中是否加入了CDCM6208的引脚约束：


set_property PACKAGE_PIN J23 [get_ports i_sys_rstn]
set_property IOSTANDARD LVCMOS33 [get_ports i_sys_rstn]
set_property PACKAGE_PIN G22 [get_ports i_sys_clk]
set_property IOSTANDARD LVCMOS33 [get_ports i_sys_clk]

set_property IOSTANDARD LVCMOS33 [get_ports o_6208_sdi]
set_property PACKAGE_PIN A20 [get_ports o_6208_sdi]

set_property IOSTANDARD LVCMOS33 [get_ports o_6208_scs]
set_property PACKAGE_PIN E22 [get_ports o_6208_scs]

set_property IOSTANDARD LVCMOS33 [get_ports o_6208_scl]
set_property PACKAGE_PIN C21 [get_ports o_6208_scl]

set_property IOSTANDARD LVCMOS33 [get_ports {o_6208_mode[0]}]
set_property PACKAGE_PIN B20 [get_ports {o_6208_mode[0]}]

set_property IOSTANDARD LVCMOS33 [get_ports {o_6208_mode[1]}]
set_property PACKAGE_PIN C22 [get_ports {o_6208_mode[1]}]

set_property IOSTANDARD LVCMOS33 [get_ports o_6208_pdn]
set_property PACKAGE_PIN B26 [get_ports o_6208_pdn]

set_property IOSTANDARD LVCMOS33 [get_ports o_6208_ref_sel]
set_property PACKAGE_PIN B21 [get_ports o_6208_ref_sel]

set_property BITSTREAM.CONFIG.UNUSEDPIN PULLNONE [current_design]
set_property BITSTREAM.GENERAL.COMPRESS TRUE [current_design]
set_property CONFIG_VOLTAGE 3.3 [current_design]
set_property CFGBVS VCCO [current_design]