From ffdfed23dfdabd49c46eebda47eed2fe22e5a4ca Mon Sep 17 00:00:00 2001
From: Jeff Ng <jeffng@precisioninno.com>
Date: Mon, 14 Jul 2025 17:25:00 +0000
Subject: [PATCH] Updated hercules_is_int for slang; Added initial I/O
 constraints for cva6

Signed-off-by: Jeff Ng <jeffng@precisioninno.com>
---
 .../rapidus2hp/cva6/io_constraints.tcl        | 45 +++++++++++++++++++
 .../rapidus2hp/hercules_is_int/config.mk      |  4 +-
 2 files changed, 47 insertions(+), 2 deletions(-)
 create mode 100644 flow/designs/rapidus2hp/cva6/io_constraints.tcl

diff --git a/flow/designs/rapidus2hp/cva6/io_constraints.tcl b/flow/designs/rapidus2hp/cva6/io_constraints.tcl
new file mode 100644
index 0000000000..2409d99410
--- /dev/null
+++ b/flow/designs/rapidus2hp/cva6/io_constraints.tcl
@@ -0,0 +1,45 @@
+# left (bottom to top)
+# cvxif_req_o
+# axi_req_o - noc_req_o in ours
+# scan_output - doesn't exist in ours
+set_io_pin_constraint -group -order -region left:20-38.7 -pin_names {cvxif_req_o*}
+set_io_pin_constraint -group -order -region left:38.8-90.2 -pin_names {noc_req_o*}
+
+# right (bottom to top)
+# scan_input - doesn't exist in ours
+# test_mode - doesn't exist in ours
+# scan_enable - doesn't exist in ours
+# axi_resp_i - noc_resp_i in ours
+# cvxif_resp_i
+# debug_req_i
+# time_irq_i
+# ipi_i
+# irq_i
+# hart_id_i
+# boot_addr_i
+# rst_ni
+# clk_i
+set_io_pin_constraint -group -order -region right:5-31.4 -pin_names {noc_resp_i*}
+set_io_pin_constraint -group -order -region right:31.5-73.1 -pin_names {cvxif_resp_i*}
+set_io_pin_constraint -group -order -region right:73.3-73.7 -pin_names {debug_req_i time_irq_i ipi_i}
+set_io_pin_constraint -group -order -region right:74-74.3 -pin_names {irq_i*}
+set_io_pin_constraint -group -order -region right:74.5-82 -pin_names {hart_id_i*}
+set_io_pin_constraint -group -order -region right:82.2-89.8 -pin_names {boot_addr_i*}
+set_io_pin_constraint -group -order -region right:89.9-90.3 -pin_names {rst_n_i clk_i}
+
+# don't exist in reference design implementation - does it make us I/O bound?
+# put a third of them on the top, a third on the bottom, and let the placer
+# decide where to put the remaining third
+set num_rvfi_probes_ports 4295
+set third_rvfi_probes_ports [expr $num_rvfi_probes_ports / 3]
+set top_group {}
+for { set i 0 } { $i < $third_rvfi_probes_ports } { incr i } {
+    lappend top_group "rvfi_probes_o\[$i\]"
+}
+set bottom_group {}
+for {} { $i < [expr $third_rvfi_probes_ports * 2]} { incr i } {
+    lappend bottom_group "rvfi_probes_o\[$i\]"
+}
+
+set_io_pin_constraint -group -order -region bottom:* -pin_names $top_group
+set_io_pin_constraint -group -order -region top:* -pin_names $bottom_group
diff --git a/flow/designs/rapidus2hp/hercules_is_int/config.mk b/flow/designs/rapidus2hp/hercules_is_int/config.mk
index 6ccb921da5..f41a96abf1 100644
--- a/flow/designs/rapidus2hp/hercules_is_int/config.mk
+++ b/flow/designs/rapidus2hp/hercules_is_int/config.mk
@@ -124,10 +124,10 @@ export SDC_FILE               = $(DESIGN_HOME)/$(PLATFORM)/$(DESIGN_NAME)/prects
 export SYNTH_HDL_FRONTEND  = slang
 export SYNTH_HIERARCHICAL ?= 0
 
-export CORE_UTILIZATION       = 25
+export CORE_UTILIZATION       = 35
 
 export CORE_MARGIN            = 2
-export MACRO_PLACE_HALO       = 4 4
+export MACRO_PLACE_HALO       = 2 2
 
 export PLACE_DENSITY          = 0.58