first commit after restructuring

adi_library/jesd204/jesd204_tx/jesd204_tx_constr.ttcl

@@ -0,0 +1,58 @@
+#
+# The ADI JESD204 Core is released under the following license, which is
+# different than all other HDL cores in this repository.
+#
+# Please read this, and understand the freedoms and responsibilities you have
+# by using this source code/core.
+#
+# The JESD204 HDL, is copyright © 2016-2017 Analog Devices Inc.
+#
+# This core is free software, you can use run, copy, study, change, ask
+# questions about and improve this core. Distribution of source, or resulting
+# binaries (including those inside an FPGA or ASIC) require you to release the
+# source of the entire project (excluding the system libraries provide by the
+# tools/compiler/FPGA vendor). These are the terms of the GNU General Public
+# License version 2 as published by the Free Software Foundation.
+#
+# This core  is distributed in the hope that it will be useful, but WITHOUT ANY
+# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+# A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License version 2
+# along with this source code, and binary.  If not, see
+# <http://www.gnu.org/licenses/>.
+#
+# Commercial licenses (with commercial support) of this JESD204 core are also
+# available under terms different than the General Public License. (e.g. they
+# do not require you to accompany any image (FPGA or ASIC) using the JESD204
+# core with any corresponding source code.) For these alternate terms you must
+# purchase a license from Analog Devices Technology Licensing Office. Users
+# interested in such a license should contact [email protected] for
+# more information. This commercial license is sub-licensable (if you purchase
+# chips from Analog Devices, incorporate them into your PCB level product, and
+# purchase a JESD204 license, end users of your product will also have a
+# license to use this core in a commercial setting without releasing their
+# source code).
+#
+# In addition, we kindly ask you to acknowledge ADI in any program, application
+# or publication in which you use this JESD204 HDL core. (You are not required
+# to do so; it is up to your common sense to decide whether you want to comply
+# with this request or not.) For general publications, we suggest referencing :
+# “The design and implementation of the JESD204 HDL Core used in this project
+# is copyright © 2016-2017, Analog Devices, Inc.”
+#
+<: set ComponentName [getComponentNameString] :>
+<: setOutputDirectory "./" :>
+<: setFileName [ttcl_add $ComponentName "_constr"] :>
+<: setFileExtension ".xdc" :>
+<: setFileProcessingOrder late :>
+<: set sysref_iob [get_property PARAM_VALUE.SYSREF_IOB] :>
+
+set_property ASYNC_REG TRUE \
+  [get_cells {i_lmfc/sysref_d1_reg}] \
+  [get_cells {i_lmfc/sysref_d2_reg}]
+
+# Make sure that the device clock to sysref skew is at least somewhat
+# predictable
+set_property IOB <=: $sysref_iob :> \
+  [get_cells {i_lmfc/sysref_r_reg}]