From 9df9d7ff905d1d6c49221607efc9a04f042ea003 Mon Sep 17 00:00:00 2001
From: Clifford Wolf <clifford@clifford.at>
Date: Sat, 6 Jun 2015 20:14:58 +0200
Subject: [PATCH] Improved Xilinx example

---
 .gitignore                                   |  6 +-
 Makefile                                     |  5 +-
 scripts/.gitignore                           |  4 ++
 synth_vivado.tcl => scripts/synth_vivado.tcl |  6 +-
 synth_vivado.xdc => scripts/synth_vivado.xdc |  0
 scripts/synth_vivado_soc.v                   | 58 ++++++++++++++++++++
 6 files changed, 69 insertions(+), 10 deletions(-)
 create mode 100644 scripts/.gitignore
 rename synth_vivado.tcl => scripts/synth_vivado.tcl (60%)
 rename synth_vivado.xdc => scripts/synth_vivado.xdc (100%)
 create mode 100644 scripts/synth_vivado_soc.v

diff --git a/.gitignore b/.gitignore
index 7cbb88b..c3a91c8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,16 +1,14 @@
+tests/*.o
 firmware/firmware.bin
 firmware/firmware.elf
 firmware/firmware.hex
 firmware/firmware.map
 testbench.exe
+testbench_axi.exe
 testbench.vcd
-tests/*.o
 dhrystone/dhry.bin
 dhrystone/dhry.elf
 dhrystone/dhry.hex
 dhrystone/dhry.map
 dhrystone/*.d
 dhrystone/*.o
-fsm_encoding.os
-synth_vivado.log
-synth_vivado.v
diff --git a/Makefile b/Makefile
index ab629ea..cd610ae 100644
--- a/Makefile
+++ b/Makefile
@@ -32,13 +32,10 @@ tests/%.o: tests/%.S tests/riscv_test.h tests/test_macros.h
 	riscv64-unknown-elf-gcc -m32 -march=RV32I -c -o $@ -DTEST_FUNC_NAME=$(notdir $(basename $<)) \
 		-DTEST_FUNC_TXT='"$(notdir $(basename $<))"' -DTEST_FUNC_RET=$(notdir $(basename $<))_ret $<
 
-synth_vivado:
-	vivado -nojournal -log synth_vivado.log -mode batch -source synth_vivado.tcl
-
 clean:
 	rm -vrf $(TEST_OBJS) firmware/firmware.elf firmware/firmware.bin firmware/firmware.hex \
 		firmware/firmware.map testbench.exe testbench.vcd .Xil fsm_encoding.os \
 		synth_vivado.log synth_vivado_*.backup.log synth_vivado.v
 
-.PHONY: test synth_vivado clean
+.PHONY: test test_axi clean
 
diff --git a/scripts/.gitignore b/scripts/.gitignore
new file mode 100644
index 0000000..74c116e
--- /dev/null
+++ b/scripts/.gitignore
@@ -0,0 +1,4 @@
+fsm_encoding.os
+synth_vivado.log
+synth_vivado_*.backup.log
+synth_vivado_syn.v
diff --git a/synth_vivado.tcl b/scripts/synth_vivado.tcl
similarity index 60%
rename from synth_vivado.tcl
rename to scripts/synth_vivado.tcl
index 2dd4fce..1685721 100644
--- a/synth_vivado.tcl
+++ b/scripts/synth_vivado.tcl
@@ -1,10 +1,12 @@
 
 # vivado -nojournal -log synth_vivado.log -mode batch -source synth_vivado.tcl
 
-read_verilog picorv32.v
+read_verilog synth_vivado_soc.v
+read_verilog ../picorv32.v
 read_xdc synth_vivado.xdc
 
 synth_design -part xc7a15t-csg324 -top picorv32_axi
+# synth_design -part xc7a15t-csg324 -top test_soc
 opt_design
 place_design
 route_design
@@ -12,5 +14,5 @@ route_design
 report_utilization
 report_timing
 
-write_verilog -force synth_vivado.v
+write_verilog -force synth_vivado_syn.v
 
diff --git a/synth_vivado.xdc b/scripts/synth_vivado.xdc
similarity index 100%
rename from synth_vivado.xdc
rename to scripts/synth_vivado.xdc
diff --git a/scripts/synth_vivado_soc.v b/scripts/synth_vivado_soc.v
new file mode 100644
index 0000000..64d70ae
--- /dev/null
+++ b/scripts/synth_vivado_soc.v
@@ -0,0 +1,58 @@
+`timescale 1 ns / 1 ps
+
+module test_soc (
+	input         clk,
+	input         resetn,
+	output        trap,
+	output [7:0]  out_byte,
+	output        out_byte_en,
+
+	output        monitor_valid,
+	output [31:0] monitor_addr,
+	output [31:0] monitor_data
+);
+	parameter MEM_SIZE = 64*1024/4;
+
+	wire mem_valid;
+	wire mem_instr;
+	wire mem_ready;
+	wire [31:0] mem_addr;
+	wire [31:0] mem_wdata;
+	wire [3:0] mem_wstrb;
+	wire [31:0] mem_rdata;
+
+	picorv32 uut (
+		.clk      (clk      ),
+		.resetn   (resetn   ),
+		.trap     (trap     ),
+		.mem_valid(mem_valid),
+		.mem_instr(mem_instr),
+		.mem_ready(mem_ready),
+		.mem_addr (mem_addr ),
+		.mem_wdata(mem_wdata),
+		.mem_wstrb(mem_wstrb),
+		.mem_rdata(mem_rdata)
+	);
+
+	assign monitor_valid = mem_valid;
+	assign monitor_addr = mem_addr;
+	assign monitor_data = mem_wstrb ? mem_wdata : mem_rdata;
+
+	reg [31:0] memory [0:MEM_SIZE-1];
+	initial $readmemh("../firmware/firmware.hex", memory);
+
+	assign mem_ready = 1;
+	assign mem_rdata = memory[mem_addr >> 2];
+
+	assign out_byte = mem_wdata[7:0];
+	assign out_byte_en = mem_addr == 32'h1000_0000;
+
+	always @(posedge clk) begin
+		if (mem_valid && (mem_addr >> 2) < MEM_SIZE) begin
+			if (mem_wstrb[0]) memory[mem_addr >> 2][ 7: 0] <= mem_wdata[ 7: 0];
+			if (mem_wstrb[1]) memory[mem_addr >> 2][15: 8] <= mem_wdata[15: 8];
+			if (mem_wstrb[2]) memory[mem_addr >> 2][23:16] <= mem_wdata[23:16];
+			if (mem_wstrb[3]) memory[mem_addr >> 2][31:24] <= mem_wdata[31:24];
+		end
+	end
+endmodule