axi_dmac: Be more specific about debug register timing exceptions

The timing exceptions for the debug paths are currently a bit to broad and
can include paths that should not have an exception.

All the debug signals are coming from the i_request_arb instance, so
include that in the match to avoid false positives.

For most projects this wont have been a problem since there is usually a
fair amount of slack on the paths that were affected by this. But in
projects with high utilization this might result in undefined behavior.

Signed-off-by: Lars-Peter Clausen <[email protected]>

library/axi_dmac/axi_dmac_constr.sdc

@@ -4,7 +4,9 @@ set_false_path -to    [get_registers *axi_dmac*cdc_sync_stage1*]
 set_false_path -from  [get_registers *axi_dmac*cdc_sync_fifo_ram*]
 set_false_path -from  [get_registers *axi_dmac*eot_mem*]
 set_false_path -to    [get_registers *axi_dmac*reset_shift*]
-set_false_path -from  [get_registers *axi_dmac*cdc_sync_stage2*]      -to [get_registers *axi_dmac*up_rdata*]
-set_false_path -from  [get_registers *axi_dmac*id*]                   -to [get_registers *axi_dmac*up_rdata*]
-set_false_path -from  [get_registers *axi_dmac*address*]              -to [get_registers *axi_dmac*up_rdata*]
+
+# Debug signals
+set_false_path -from  [get_registers *axi_dmac*|*i_request_arb*|cdc_sync_stage2*]  -to [get_registers *axi_dmac*up_rdata*]
+set_false_path -from  [get_registers *axi_dmac*|*i_request_arb*|*id*]              -to [get_registers *axi_dmac*up_rdata*]
+set_false_path -from  [get_registers *axi_dmac*|*i_request_arb*|address*]          -to [get_registers *axi_dmac*up_rdata*]