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  3. AR# 44714: PLL/MMCM DRP - Simulating XAPP878/XAPP879 Produces "Warning: Address DADDR=25"

AR# 44714

PLL/MMCM DRP - Simulating XAPP878/XAPP879 Produces "Warning: Address DADDR=25"

描述

When simulating the XAPP878 or XAPP879, the following warnings are seen in ModelSim:

# ** Warning: Warning : Address DADDR=25 on the PLL_ADV instance is unsupported. # # Time: 35430 ns Iteration: 2 Instance: /m5_clock_generator_tb/cinst_m5_clock_generator_1/cinst_pll_adv_1

# ** Warning: Warning : Address DADDR=25 on the PLL_ADV instance is unsupported. # # Time: 35570 ns Iteration: 2 Instance: /m5_clock_generator_tb/cinst_m5_clock_generator_1/cinst_pll_adv_1

# ** Warning: Warning : Address DADDR=26 on the PLL_ADV instance is unsupported. # # Time: 35710 ns Iteration: 2 Instance: /m5_clock_generator_tb/cinst_m5_clock_generator_1/cinst_pll_adv_1

# ** Warning: Warning : Address DADDR=26 on the PLL_ADV instance is unsupported. # # Time: 35850 ns Iteration: 2 Instance: /m5_clock_generator_tb/cinst_m5_clock_generator_1/cinst_pll_adv_1

# ** Warning: Warning : Address DADDR=29 on the PLL_ADV instance is unsupported. # # Time: 35990 ns Iteration: 2 Instance: /m5_clock_generator_tb/cinst_m5_clock_generator_1/cinst_pll_adv_1

# ** Warning: Warning : Address DADDR=29 on the PLL_ADV instance is unsupported.

Why is this the case?

解决方案

ThePLL and MMCM simulation model does not have all of the DRP registers available, so the simulator does not know how to handle them all and produces the warnings mentioned above. You can safely ignore them and the simulation should be correct. The warnings do not affect overall operation of the simulation.

链接问答记录

相关答复记录

Answer Number 问答标题 问题版本 已解决问题的版本
46790 Spartan-6 FPGA Design Assistant - Troubleshooting Common Clocking Problems N/A N/A
AR# 44714
日期 12/15/2012
状态 Active
Type 综合文章
器件 More Less