mirror of
https://github.com/corundum/corundum.git
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52 lines
2.7 KiB
Tcl
52 lines
2.7 KiB
Tcl
# Copyright (c) 2020 Alex Forencich
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in
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# all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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# THE SOFTWARE.
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# AXI stream asynchronous FIFO timing constraints
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proc constrain_axis_async_fifo_inst { inst } {
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puts "Inserting timing constraints for axis_async_fifo instance $inst"
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# reset synchronization
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set_false_path -from * -to [get_registers "$inst|s_rst_sync*_reg $inst|m_rst_sync*_reg"]
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if {[get_collection_size [get_registers -nowarn "$inst|s_rst_sync2_reg"]]} {
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set_max_delay -from [get_registers "$inst|s_rst_sync2_reg"] -to [get_registers "$inst|s_rst_sync3_reg"] 8.000
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}
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if {[get_collection_size [get_registers -nowarn "$inst|m_rst_sync2_reg"]]} {
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set_max_delay -from [get_registers "$inst|m_rst_sync2_reg"] -to [get_registers "$inst|m_rst_sync3_reg"] 8.000
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}
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# pointer synchronization
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set_max_delay -from [get_registers "$inst|rd_ptr_reg[*] $inst|rd_ptr_gray_reg[*]"] -to [get_registers "$inst|rd_ptr_gray_sync1_reg[*]"] 8.000
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set_max_delay -from [get_registers "$inst|wr_ptr_reg[*] $inst|wr_ptr_gray_reg[*] $inst|wr_ptr_sync_gray_reg[*]"] -to [get_registers "$inst|wr_ptr_gray_sync1_reg[*]"] 8.000
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# frame FIFO pointer update synchronization
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set_max_delay -from [get_registers "$inst|wr_ptr_update_reg"] -to [get_registers "$inst|wr_ptr_update_sync1_reg"] 8.000
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set_max_delay -from [get_registers "$inst|wr_ptr_update_sync3_reg"] -to [get_registers "$inst|wr_ptr_update_ack_sync1_reg"] 8.000
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# status synchronization
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foreach i {overflow bad_frame good_frame} {
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if {[get_collection_size [get_registers -nowarn "$inst|${i}_sync*_reg"]]} {
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set_max_delay -from [get_registers "$inst|${i}_sync1_reg"] -to [get_registers "$inst|${i}_sync2_reg"] 8.000
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}
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}
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}
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