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axi_ad9361: Add ASYNC_REG properties to CDC regs and add missing -datapath_only 

Set the ASYNC_REG property on the bit synchronizer CDC control regs. This
hint to Vivado that the registers are used for CDC purposes.

Also use -datapath_only for the set_max_delay constraints on the CDC data
path to remove the hold time requirement.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
main
Lars-Peter Clausen 2015-04-17 21:15:10 +02:00
parent 996d0fe8a4
commit 988bf60747
1 changed files with 9 additions and 3 deletions
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12
library/axi_ad9361/axi_ad9361_constr.xdc
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@ -1,13 +1,19 @@
set up_clk [get_clocks -of_objects [get_ports s_axi_aclk]]
set ad9361_clk [get_clocks -of_objects [get_ports clk]]
set_property ASYNC_REG TRUE \
[get_cells -hier *toggle_m1_reg*] \
[get_cells -hier *toggle_m2_reg*] \
[get_cells -hier *state_m1_reg*] \
[get_cells -hier *state_m2_reg*]
set_false_path \
-from [get_cells -hier up_xfer_toggle_reg* -filter {primitive_subgroup == flop}] \
-to [get_cells -hier d_xfer_toggle_m1_reg* -filter {primitive_subgroup == flop}]
set_false_path \
-from [get_cells -hier d_xfer_toggle_reg* -filter {primitive_subgroup == flop}] \
-to [get_cells -hier up_xfer_state_m1_reg* -filter {primitive_subgroup == flop}]
set_max_delay \
set_max_delay -datapath_only \
-from [get_cells -hier up_xfer_data_reg* -filter {primitive_subgroup == flop}] \
-to [get_cells -hier d_data_cntrl_reg* -filter {primitive_subgroup == flop}] \
[get_property PERIOD $ad9361_clk]
@ -18,7 +24,7 @@ set_false_path \
set_false_path \
-from [get_cells -hier up_xfer_toggle_reg* -filter {primitive_subgroup == flop}] \
-to [get_cells -hier d_xfer_state_m1_reg* -filter {primitive_subgroup == flop}]
set_max_delay \
set_max_delay -datapath_only \
-from [get_cells -hier d_xfer_data_reg* -filter {primitive_subgroup == flop}] \
-to [get_cells -hier up_data_status_reg* -filter {primitive_subgroup == flop}] \
[get_property PERIOD $up_clk]
@ -29,7 +35,7 @@ set_false_path \
set_false_path \
-from [get_cells -hier d_count_toggle_reg* -filter {primitive_subgroup == flop}] \
-to [get_cells -hier up_count_toggle_m1_reg* -filter {primitive_subgroup == flop}]
set_max_delay \
set_max_delay -datapath_only \
-from [get_cells -hier d_count_hold_reg* -filter {primitive_subgroup == flop}] \
-to [get_cells -hier up_d_count_reg* -filter {primitive_subgroup == flop}] \
[get_property PERIOD $up_clk]