diff --git a/top/b200/b210.xdc b/top/b200/b210.xdc
index 2f54486..c078eee 100644
--- a/top/b200/b210.xdc
+++ b/top/b200/b210.xdc
@@ -175,11 +175,44 @@ set_property -dict {PACKAGE_PIN J10 IOSTANDARD LVCMOS33} [get_ports tx_enable2]
 create_clock -period 10.000 -name IFCLK [get_ports IFCLK]
 create_clock -period 16.276 -name codec_data_clk_p [get_ports codec_data_clk_p]
 
+# --------------------------------------------------------------------------
+# Radio clock BUFGMUX modes
+#
+# Vivado 2026.1 inferred these constraints with:
+#   write_inferred_xdc -excl_clocks
+#
+# The radio clock tree can run from either:
+#   I0 = codec_data_clk_p       (full-rate / SISO)
+#   I1 = rx_clk_mimo_bufr       (divide-by-2 / MIMO)
+#
+# These two modes are mutually exclusive only downstream of BUFGMUX_inst.
+# Keep their upstream interaction intact.
+# --------------------------------------------------------------------------
 
+create_generated_clock \
+    -name codec_data_clk_p_Gen \
+    -source [get_pins b200_io_i0/BUFGMUX_inst/I0] \
+    -add \
+    -master_clock codec_data_clk_p \
+    -divide_by 1 \
+    [get_pins b200_io_i0/BUFGMUX_inst/O]
+
+create_generated_clock \
+    -name rx_clk_mimo_bufr_Gen \
+    -source [get_pins b200_io_i0/BUFGMUX_inst/I1] \
+    -add \
+    -master_clock [get_clocks -of [get_pins b200_io_i0/BUFGMUX_inst/I1] -filter {IS_GENERATED}] \
+    -divide_by 1 \
+    [get_pins b200_io_i0/BUFGMUX_inst/O]
+
+set_clock_groups \
+    -logically_exclusive \
+    -group [get_clocks -include_generated_clocks {codec_data_clk_p_Gen}] \
+    -group [get_clocks -include_generated_clocks {rx_clk_mimo_bufr_Gen}]
 
 set_false_path -from [get_clocks -of_objects [get_pins gen_clks/inst/mmcm_adv_inst/CLKOUT1]] -to [get_clocks codec_data_clk_p]
 set_false_path -from [get_clocks -of_objects [get_pins gen_clks/inst/mmcm_adv_inst/CLKOUT1]] -to [get_clocks -of_objects [get_pins b200_io_i0/BUFR_inst/O]]
 set_false_path -from [get_clocks codec_data_clk_p] -to [get_clocks -of_objects [get_pins gen_clks/inst/mmcm_adv_inst/CLKOUT1]]
 set_false_path -from [get_clocks -of_objects [get_pins b200_io_i0/BUFR_inst/O]] -to [get_clocks -of_objects [get_pins gen_clks/inst/mmcm_adv_inst/CLKOUT1]]
 
-set_property BITSTREAM.GENERAL.COMPRESS TRUE [current_design]
\ No newline at end of file
+set_property BITSTREAM.GENERAL.COMPRESS TRUE [current_design]