From 93720fe19604fb2e21d087b2e3f98138dacc0d79 Mon Sep 17 00:00:00 2001
From: Mikhail Yenuchenko <76039929+mixeme@users.noreply.github.com>
Date: Tue, 20 Jan 2026 17:14:51 +0300
Subject: [PATCH] Create scr1_top_ahb.sdc

---
 src/sdc/scr1_top_ahb.sdc | 106 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 106 insertions(+)
 create mode 100644 src/sdc/scr1_top_ahb.sdc

diff --git a/src/sdc/scr1_top_ahb.sdc b/src/sdc/scr1_top_ahb.sdc
new file mode 100644
index 0000000..4444b23
--- /dev/null
+++ b/src/sdc/scr1_top_ahb.sdc
@@ -0,0 +1,106 @@
+### Stage:				"Synthesis and PaR"
+### File description:			"Constraints for the design"
+
+
+# SET LIB UNITS
+set_units -time 1.0ns;
+set_units -capacitance 1.0pF;
+
+set_max_capacitance 0.5 [all_outputs]
+
+### ====================== CLOCKS ===========================
+#clock uncertainty: 200ps 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"]
+#tck->10MHz
+create_clock -name "tck" -period $TCK_PERIOD -waveform "0 [expr $TCK_PERIOD/2.0]" [get_ports "tck"]
+#rtc_clk->100kHz
+create_clock -name "rtc_clk" -period $RTC_CLK_PERIOD -waveform "0 [expr $RTC_CLK_PERIOD/2.0]" [get_ports "rtc_clk"]
+
+set_clock_groups -asynchronous -group {"clk"} -group {"tck"} -group {"rtc_clk"} 
+
+set MINRISE 0
+set MAXRISE 1.0
+set MINFALL 0
+set MAXFALL 1.0
+
+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"]
+
+set_clock_uncertainty $CLK_UNCERT [get_clocks "tck"]
+set_clock_transition -rise -min $MINRISE [get_clocks "tck"]
+set_clock_transition -rise -max $MAXRISE [get_clocks "tck"]
+set_clock_transition -fall -min $MINFALL [get_clocks "tck"]
+set_clock_transition -fall -max $MAXFALL [get_clocks "tck"]
+
+set_clock_uncertainty $CLK_UNCERT [get_clocks "rtc_clk"]
+set_clock_transition -rise -min $MINRISE [get_clocks "rtc_clk"]
+set_clock_transition -rise -max $MAXRISE [get_clocks "rtc_clk"]
+set_clock_transition -fall -min $MINFALL [get_clocks "rtc_clk"]
+set_clock_transition -fall -max $MAXFALL [get_clocks "rtc_clk"]
+
+
+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"]
+
+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 [remove_from_collection [all_inputs] {trst_n tdi tms}]
+set_input_delay -clock "clk" -min $INPUT_DELAY_CLK [remove_from_collection [all_inputs] {trst_n tdi tms}]
+
+set_input_delay -clock "tck" -max $INPUT_DELAY_TCK [get_ports {trst_n tdi tms}]
+set_input_delay -clock "tck" -min $INPUT_DELAY_TCK [get_ports {trst_n tdi tms}]
+
+
+set_output_delay -clock "clk" -max $OUTPUT_DELAY_CLK [remove_from_collection [all_outputs] {tdo tdo_en}]
+set_output_delay -clock "clk" -min $OUTPUT_DELAY_CLK [remove_from_collection [all_outputs] {tdo tdo_en}]
+
+set_output_delay -clock "tck" -max $OUTPUT_DELAY_TCK [get_ports {tdo tdo_en}]
+set_output_delay -clock "tck" -min $OUTPUT_DELAY_TCK [get_ports {tdo tdo_en}]
+
+
+set_case_analysis 0 [get_ports "test_mode"]     
+
+#  |--------------|
+#->|              |->
+#->|     clk      |->
+#  |              |
+#  ----------------
+#  |     rtc      |
+#  ----------------
+#->|              |->tdo
+#->|     tck      |->tdo_en
+#  |              |
+#  |--------------|
+
+
+
+
+