pluto_hdl_adi/library/util_cdc/util_cdc_constr.tcl

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# ***************************************************************************
# ***************************************************************************
# 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[*]}]]
}
}