From 9ed2c9a8f4c50a19e85fcf50453e3186b33a5908 Mon Sep 17 00:00:00 2001
From: Mikhail Yenuchenko <76039929+mixeme@users.noreply.github.com>
Date: Wed, 21 Jan 2026 15:09:42 +0300
Subject: [PATCH] Update scr1_core_top.sdc

---
 src/sdc/scr1_core_top.sdc | 57 ++++++++++++++++++---------------------
 1 file changed, 26 insertions(+), 31 deletions(-)

diff --git a/src/sdc/scr1_core_top.sdc b/src/sdc/scr1_core_top.sdc
index 0dac8c0..007b3db 100644
--- a/src/sdc/scr1_core_top.sdc
+++ b/src/sdc/scr1_core_top.sdc
@@ -1,5 +1,5 @@
 ### Stage:				"Synthesis and PaR"
-### File description:			"Constraints for the design"
+### File description:	"Constraints for the design"
 
 
 # SET LIB UNITS
@@ -9,58 +9,57 @@ set_units -capacitance 1.0pF;
 set_max_capacitance 0.5 [all_outputs]
 
 ### ====================== CLOCKS ===========================
-#clock uncertainty: 200ps for all clocks
+# Clock period: 10 ns (100 MHz)
+set CLK_PERIOD 100
+
+
+# Clock uncertainty: 200 ps for all clocks
 set CLK_UNCERT 0.2;
-#transition: 1ns R/F
-
-# CLOCK PERIOD
-set CLK_PERIOD 11.13
-set TCK_PERIOD 100
-set RTC_CLK_PERIOD 10000
-
-# IO DELAYS
-set INPUT_DELAY_CLK       [expr $CLK_PERIOD/4.0]
-set OUTPUT_DELAY_CLK      [expr $CLK_PERIOD/4.0]
-
-set INPUT_DELAY_TCK       [expr $TCK_PERIOD/4.0]
-set OUTPUT_DELAY_TCK      [expr $TCK_PERIOD/4.0]
-
-#clk->100MHz 
-create_clock -name "clk" -period $CLK_PERIOD -waveform "0 [expr $CLK_PERIOD/2.0]" [get_ports "clk"]
 
 
+# Clock transition: 1 ns R/F
 set MINRISE 0
 set MAXRISE 1.0
 set MINFALL 0
 set MAXFALL 1.0
 
+
 # Clock setup
+create_clock -name "clk" -period $CLK_PERIOD -waveform "0 [expr $CLK_PERIOD/2.0]" [get_ports "clk"]
+
 set_clock_uncertainty $CLK_UNCERT [get_clocks "clk"]
+
 set_clock_transition -rise -min $MINRISE [get_clocks "clk"]
 set_clock_transition -rise -max $MAXRISE [get_clocks "clk"]
 set_clock_transition -fall -min $MINFALL [get_clocks "clk"]
 set_clock_transition -fall -max $MAXFALL [get_clocks "clk"]
 
+### ====================== DELAYS ===========================
+# IO delays: 2.5 ns
+set INPUT_DELAY_CLK       [expr $CLK_PERIOD/4.0]
+set OUTPUT_DELAY_CLK      [expr $CLK_PERIOD/4.0]
+
+
+# IO delays setup
+set_input_delay -clock "clk" -max $INPUT_DELAY_CLK [all_inputs]
+set_input_delay -clock "clk" -min $INPUT_DELAY_CLK [all_inputs]
+
+set_output_delay -clock "clk" -max $OUTPUT_DELAY_CLK [all_outputs]
+set_output_delay -clock "clk" -min $OUTPUT_DELAY_CLK [all_outputs]
+
+
 # Ideal networks
 set_ideal_network [get_ports "pwrup_rst_n"]
 set_ideal_network [get_ports "rst_n"]
 set_ideal_network [get_ports "cpu_rst_n"]
 set_ideal_network [get_ports "test_rst_n"]
-#set_ideal_network [get_ports "trst_n"]
+
 
 # False paths
 set_false_path -from [get_ports "pwrup_rst_n"]
 set_false_path -from [get_ports "rst_n"]
 set_false_path -from [get_ports "cpu_rst_n"]
 set_false_path -from [get_ports "test_rst_n"]
-#set_false_path -from [get_ports "trst_n"]
-
-#IO delays:
-set_input_delay -clock "clk" -max $INPUT_DELAY_CLK [all_inputs]
-set_input_delay -clock "clk" -min $INPUT_DELAY_CLK [all_inputs]
-
-set_output_delay -clock "clk" -max $OUTPUT_DELAY_CLK [all_outputs]
-set_output_delay -clock "clk" -min $OUTPUT_DELAY_CLK [all_outputs]
 
 
 set_case_analysis 0 [get_ports "test_mode"]     
@@ -77,7 +76,3 @@ set_case_analysis 0 [get_ports "test_mode"]
 #  |              |
 #  |--------------|
 
-
-
-
-