zcy
/
pluto_hdl_adi
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

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>
main
Lars-Peter Clausen 2015-11-06 15:17:55 +01:00
parent 9915234cb0
commit 6cd0d8a412
1 changed files with 2 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
library/axi_dmac/axi_dmac_constr.ttcl
View File

@ -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 \