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axi_dmac: Don't add CDC constraints when all clocks are synchronous 

When all clocks are synchronous there are no synchronizers and the
constraint for the CDC registers can't find any cells which generates a
warning. To avoid this don't add CDC constraints when all the clocks are
synchronous.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
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Lars-Peter Clausen 2015-11-06 15:17:55 +01:00
parent 999eccc134
commit cba53774ca
1 changed files with 2 additions and 0 deletions
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2
library/axi_dmac/axi_dmac_constr.ttcl
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@ -11,10 +11,12 @@ set req_clk [get_clocks -of_objects [get_ports s_axi_aclk]]
set src_clk [get_clocks -of_objects [get_ports -quiet {fifo_wr_clk s_axis_aclk m_src_axi_aclk}]]
set dest_clk [get_clocks -of_objects [get_ports -quiet {fifo_rd_clk m_axis_aclk m_dest_axi_aclk}]]
<: if {$async_req_src || $async_src_dest || $async_dest_req} { :>
set_property ASYNC_REG TRUE \
[get_cells -quiet -hier *cdc_sync_stage1_reg*] \
[get_cells -quiet -hier *cdc_sync_stage2_reg*]
<: } :>
<: if {$async_req_src} { :>
set_max_delay -quiet -datapath_only \
-from $req_clk \