corundum/syn/vivado/eth_mac.tcl

# Copyright (c) 2019 Alex Forencich
# 
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
# 
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# THE SOFTWARE.

# Ethernet MAC timing constraints

foreach inst [get_cells -hier -regexp -filter {(ORIG_REF_NAME =~ "eth_mac_(1g|10g)(__\w+__\d+)?" ||
        REF_NAME =~ "eth_mac_(1g|10g)(__\w+__\d+)?")}] {
    puts "Inserting timing constraints for Ethernet MAC instance $inst"

    set sync_ffs [get_cells -quiet -hier -regexp ".*/mac_ctrl.tx_lfc_req_sync_reg_\[1234\]_reg" -filter "PARENT == $inst"]

    if {[llength $sync_ffs]} {
        set_property ASYNC_REG TRUE $sync_ffs

        set src_clk [get_clocks -of_objects [get_pins $inst/mac_ctrl.tx_lfc_req_sync_reg_1_reg/C]]

        set src_clk_period [if {[llength $src_clk]} {get_property -min PERIOD $src_clk} {expr 1.0}]

        set_max_delay -from [get_cells $inst/mac_ctrl.tx_lfc_req_sync_reg_1_reg] -to [get_cells $inst/mac_ctrl.tx_lfc_req_sync_reg_2_reg] -datapath_only $src_clk_period
    }

    set sync_ffs [get_cells -quiet -hier -regexp ".*/mac_ctrl.rx_lfc_ack_sync_reg_\[1234\]_reg" -filter "PARENT == $inst"]

    if {[llength $sync_ffs]} {
        set_property ASYNC_REG TRUE $sync_ffs

        set src_clk [get_clocks -of_objects [get_pins $inst/mac_ctrl.rx_lfc_ack_sync_reg_1_reg/C]]

        set src_clk_period [if {[llength $src_clk]} {get_property -min PERIOD $src_clk} {expr 1.0}]

        set_max_delay -from [get_cells $inst/mac_ctrl.rx_lfc_ack_sync_reg_1_reg] -to [get_cells $inst/mac_ctrl.rx_lfc_ack_sync_reg_2_reg] -datapath_only $src_clk_period
    }
}