[Place 30-150] Sub-optimal placement for an MMCM-BUFG component pair. If this sub optimal condition is acceptable for this design, you may use the CLOCK_DEDICATED_ROUTE constraint in the .xdc file to demote this message to a WARNING. However, the use of this override is highly discouraged. These examples can be used directly in the .xdc file to override this clock rule.
< set_property CLOCK_DEDICATED_ROUTE FALSE [get_nets srio_dsp_inst/srio_user_wrapper_inst/k7_srio_x4_2g5_inst/inst/srio_clk_inst/clkout1] >
srio_dsp_inst/srio_user_wrapper_inst/k7_srio_x4_2g5_inst/inst/srio_clk_inst/srio_mmcm_inst (MMCME2_ADV.CLKOUT1) is provisionally placed by clockplacer on MMCME2_ADV_X0Y3
srio_dsp_inst/srio_user_wrapper_inst/k7_srio_x4_2g5_inst/inst/srio_clk_inst/phy_clk_bufg_inst (BUFGCTRL.I1) is provisionally placed by clockplacer on BUFGCTRL_X0Y15
srio_dsp_inst/srio_user_wrapper_inst/k7_srio_x4_2g5_inst/inst/srio_clk_inst/drpclk_bufr_inst (BUFG.I) is provisionally placed by clockplacer on BUFGCTRL_X0Y16
The above error could possibly be related to other connected instances. Following is a list of
all the related clock rules and their respective instances.
Clock Rule: rule_mmcm_bufg
Status: PASS
Rule Description: An MMCM driving a BUFG must be placed on the same half side (top/bottom) of the device
srio_dsp_inst/srio_user_wrapper_inst/k7_srio_x4_2g5_inst/inst/srio_clk_inst/srio_mmcm_inst (MMCME2_ADV.CLKOUT0) is provisionally placed by clockplacer on MMCME2_ADV_X0Y3
srio_dsp_inst/srio_user_wrapper_inst/k7_srio_x4_2g5_inst/inst/srio_clk_inst/phy_clk_bufg_inst (BUFGCTRL.I0) is provisionally placed by clockplacer on BUFGCTRL_X0Y15
srio_dsp_inst/srio_user_wrapper_inst/k7_srio_x4_2g5_inst/inst/srio_clk_inst/log_clk_bufg_inst (BUFG.I) is provisionally placed by clockplacer on BUFGCTRL_X0Y14
srio_dsp_inst/srio_user_wrapper_inst/k7_srio_x4_2g5_inst/inst/srio_clk_inst/gt_clk_bufg_inst (BUFG.I) is provisionally placed by clockplacer on BUFGCTRL_X0Y13
Clock Rule: rule_mmcm_bufg
Status: FAIL
Rule Description: An MMCM driving a BUFG must be placed on the same half side (top/bottom) of the device
srio_dsp_inst/srio_user_wrapper_inst/k7_srio_x4_2g5_inst/inst/srio_clk_inst/srio_mmcm_inst (MMCME2_ADV.CLKOUT2) is provisionally placed by clockplacer on MMCME2_ADV_X0Y3
srio_dsp_inst/srio_user_wrapper_inst/k7_srio_x4_2g5_inst/inst/srio_clk_inst/gt_pcs_clk_bufg_inst (BUFG.I) is provisionally placed by clockplacer on BUFGCTRL_X0Y17
ERROR: The above is also an illegal clock rule
Workaround: < set_property CLOCK_DEDICATED_ROUTE ANY_CMT_COLUMN [get_nets srio_dsp_inst/srio_user_wrapper_inst/k7_srio_x4_2g5_inst/inst/srio_clk_inst/clkout2] >
Clock Rule: rule_mmcm_mmcm
Status: PASS
Rule Description: An MMCM driving an MMCM must be in the same CMT column, and they are adjacent to
each other (vertically), if the CLOCK_DEDICATED_ROUTE=BACKBONE constraint is NOT set
srio_dsp_inst/srio_user_wrapper_inst/k7_srio_x4_2g5_inst/inst/srio_clk_inst/srio_mmcm_inst (MMCME2_ADV.CLKFBOUT) is provisionally placed by clockplacer on MMCME2_ADV_X0Y3
and srio_dsp_inst/srio_user_wrapper_inst/k7_srio_x4_2g5_inst/inst/srio_clk_inst/srio_mmcm_inst (MMCME2_ADV.CLKFBIN) is provisionally placed by clockplacer on MMCME2_ADV_X0Y3
这个错误其实就是BUFG不够了，想办法减少BUFG，可以减少或整合时钟，或者减少时钟的BUFG
