first commit after restructuring

adi_library/util_cdc/util_cdc_constr.tcl

@@ -0,0 +1,58 @@
+# ***************************************************************************
+# ***************************************************************************
+# Copyright 2014 - 2017 (c) Analog Devices, Inc. All rights reserved.
+#
+# Each core or library found in this collection may have its own licensing terms.
+# The user should keep this in in mind while exploring these cores.
+#
+# Redistribution and use in source and binary forms,
+# with or without modification of this file, are permitted under the terms of either
+#  (at the option of the user):
+#
+#   1. The GNU General Public License version 2 as published by the
+#      Free Software Foundation, which can be found in the top level directory, or at:
+# https://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html
+#
+# OR
+#
+#   2.  An ADI specific BSD license as noted in the top level directory, or on-line at:
+# https://github.com/analogdevicesinc/hdl/blob/dev/LICENSE
+#
+# ***************************************************************************
+# ***************************************************************************
+
+proc util_cdc_sync_bits_constr {inst {from {}}} {
+  if {$from != {}} {
+    set_false_path \
+      -from [get_registers $from] \
+      -to   [get_registers [format "%s%s" ${inst} {|cdc_sync_stage1[0]}]]
+  } else {
+    set_false_path \
+      -to   [get_registers [format "%s%s" ${inst} {|cdc_sync_stage1[0]}]]
+  }
+}
+
+proc util_cdc_sync_data_constr {inst} {
+  util_cdc_sync_bits_constr ${inst}|sync_bits:i_sync_out ${inst}|in_toggle_d1
+  util_cdc_sync_bits_constr ${inst}|sync_bits:i_sync_in ${inst}|out_toggle_d1
+
+  # set_max_skew
+  set_false_path \
+    -from [get_registers [format "%s%s" ${inst} {|cdc_hold[*]}]] \
+    -to   [get_registers [format "%s%s" ${inst} {|out_data[*]}]]
+}
+
+proc util_cdc_sync_event_constr {inst} {
+  util_cdc_sync_bits_constr ${inst}|sync_bits:i_sync_out ${inst}|in_toggle_d1
+  util_cdc_sync_bits_constr ${inst}|sync_bits:i_sync_in ${inst}|out_toggle_d1
+
+  set cdc_hold_reg [get_registers -nowarn [format "%s%s" ${inst} {|cdc_hold[*]}]]
+
+  # For a event synchronizer with one event there is no hold register
+  if {[get_collection_size ${cdc_hold_reg}] != 0} {
+    # set_max_skew
+    set_false_path \
+      -from ${cdc_hold_reg} \
+      -to   [get_registers [format "%s%s" ${inst} {|out_event[*]}]]
+  }
+}