diff --git a/README.md b/README.md
index 5ec60343..e4f27ad7 100644
--- a/README.md
+++ b/README.md
@@ -1,23 +1,34 @@
 # Vortex RISC-V GPGPU
 
-Vortex currently supported RISC-V RV32I ISA
+Vortex is a full-system RISCV-based GPGPU processor.
 
-/benchmarks containts test benchmarks
+Specifications
+--------------
 
-/docs contains documentation.
+- Support RISC-V RV32I ISA
+- Fully scalable: 1 to 16 cores with optional L2 and L3 caches
+- OpenCL 1.2 Support 
+- FPGA target: Intel Arria 10 @ 200 MHz peak Freq
 
-/hw constains hardware sources.
+Directory structure
+-------------------
 
-/driver contains the driver software.
+- benchmarks: OpenCL and RISC-V benchmarks
+ 
+- docs: documentation.
 
-/runtime contains the kernel runtime software.
+- hw: hardware sources.
 
-/SimX contains a cycle-approximate simulator for Vortex.
+- driver: driver software.
 
-/evaluation contains the synthesis/runtime reports.
+- runtime: runtime software for kernels.
 
-Basic Instructions to run OpenCL Benchmarks on Vortex
------------------------------------------------------
+- simX: Vortex cycle-approximate simulator.
+
+- evaluation: synthesis and performance data.
+
+Basic Installation
+------------------
 
 Install development tools 
 
@@ -55,8 +66,8 @@ Install Vortex
     $ cd Vortex
     $ make
 
-Run SGEMM OpenCL Benchmark
+Quick Test running SGEMM kernel
 
-    $ cd Vortex/benchmarks/opencl/sgemm
+    $ cd /Vortex/benchmarks/opencl/sgemm
     $ make
     $ make run
diff --git a/driver/rtlsim/Makefile b/driver/rtlsim/Makefile
index bafa89bc..4129ade5 100644
--- a/driver/rtlsim/Makefile
+++ b/driver/rtlsim/Makefile
@@ -13,11 +13,11 @@ DBG_PRINT_FLAGS += -DDBG_PRINT_DRAM
 DBG_PRINT_FLAGS += -DDBG_PRINT_PIPELINE  
 DBG_PRINT_FLAGS += -DDBG_PRINT_OPAE
 
-DBG_FLAGS += $(DBG_PRINT_FLAGS)
+#DBG_FLAGS += $(DBG_PRINT_FLAGS)
 DBG_FLAGS += -DDBG_CORE_REQ_INFO
 
-#CONFIGS += -DNUM_CLUSTERS=2 -DNUM_CORES=4
-#CONFIGS += -DNUM_CLUSTERS=1 -DNUM_CORES=4
+#CONFIGS += -DNUM_CLUSTERS=2 -DNUM_CORES=4 -DL2_ENABLE=1
+#CONFIGS += -DNUM_CLUSTERS=1 -DNUM_CORES=4 -DL2_ENABLE=1
 #CONFIGS += -DNUM_CLUSTERS=1 -DNUM_CORES=2
 
 #DEBUG=1
@@ -38,8 +38,7 @@ RTL_INCLUDE = -I../../hw/rtl -I../../hw/rtl/libs -I../../hw/rtl/interfaces -I../
 
 VL_FLAGS += --language 1800-2009 --assert -Wall -Wpedantic $(CONFIGS)
 VL_FLAGS += -Wno-DECLFILENAME
-VL_FLAGS += --x-initial unique
-VL_FLAGS += --x-assign unique
+VL_FLAGS += --x-initial unique --x-assign unique
 
 # Enable Verilator multithreaded simulation
 #THREADS ?= $(shell python3 -c 'import multiprocessing as mp; print(max(1, mp.cpu_count() // 2))')
diff --git a/hw/opae/Makefile b/hw/opae/Makefile
index 039f01d2..eddd6849 100644
--- a/hw/opae/Makefile
+++ b/hw/opae/Makefile
@@ -2,7 +2,7 @@ ASE_BUILD_DIR=build_ase
 
 FPGA_BUILD_DIR=build_fpga
 
-all: ase-2c
+all: ase-1c
 
 ase-1c: setup-ase-1c
 	make -C $(ASE_BUILD_DIR)_1c
@@ -10,47 +10,72 @@ ase-1c: setup-ase-1c
 ase-2c: setup-ase-2c
 	make -C $(ASE_BUILD_DIR)_2c
 
+ase-4c: setup-ase-4c
+	make -C $(ASE_BUILD_DIR)_4c
+
 setup-ase-1c: $(ASE_BUILD_DIR)_1c/Makefile
 
 setup-ase-2c: $(ASE_BUILD_DIR)_2c/Makefile
 
+setup-ase-4c: $(ASE_BUILD_DIR)_4c/Makefile
+
 $(ASE_BUILD_DIR)_1c/Makefile:
 	afu_sim_setup -s sources_1c.txt $(ASE_BUILD_DIR)_1c
 
 $(ASE_BUILD_DIR)_2c/Makefile:
 	afu_sim_setup -s sources_2c.txt $(ASE_BUILD_DIR)_2c
 
+$(ASE_BUILD_DIR)_4c/Makefile:
+	afu_sim_setup -s sources_4c.txt $(ASE_BUILD_DIR)_4c
+
 fpga-1c: setup-fpga-1c
 	cd $(FPGA_BUILD_DIR)_1c && qsub-synth
 
 fpga-2c: setup-fpga-2c
 	cd $(FPGA_BUILD_DIR)_2c && qsub-synth
+
+fpga-4c: setup-fpga-4c
+	cd $(FPGA_BUILD_DIR)_4c && qsub-synth
 	
 setup-fpga-1c: $(FPGA_BUILD_DIR)_1c/build/dcp.qpf
 
 setup-fpga-2c: $(FPGA_BUILD_DIR)_2c/build/dcp.qpf
 
+setup-fpga-4c: $(FPGA_BUILD_DIR)_4c/build/dcp.qpf
+
 $(FPGA_BUILD_DIR)_1c/build/dcp.qpf:
 	afu_synth_setup -s sources_1c.txt $(FPGA_BUILD_DIR)_1c
 
 $(FPGA_BUILD_DIR)_2c/build/dcp.qpf:
 	afu_synth_setup -s sources_2c.txt $(FPGA_BUILD_DIR)_2c
 
+$(FPGA_BUILD_DIR)_4c/build/dcp.qpf:
+	afu_synth_setup -s sources_4c.txt $(FPGA_BUILD_DIR)_4c
+
 run-ase-1c:
 	cd $(ASE_BUILD_DIR)_1c && make sim
 
 run-ase-2c:
 	cd $(ASE_BUILD_DIR)_2c && make sim
 
+run-ase-4c:
+	cd $(ASE_BUILD_DIR)_4c && make sim
+
 clean-ase-1c:
 	rm -rf $(ASE_BUILD_DIR)_1c
 
 clean-ase-2c:
 	rm -rf $(ASE_BUILD_DIR)_2c
 
+clean-ase-4c:
+	rm -rf $(ASE_BUILD_DIR)_4c
+
 clean-fpga-1c:
 	rm -rf $(FPGA_BUILD_DIR)_1c
 	
 clean-fpga-2c:
 	rm -rf $(FPGA_BUILD_DIR)_2c
 
+clean-fpga-4c:
+	rm -rf $(FPGA_BUILD_DIR)_4c
+
diff --git a/hw/opae/README b/hw/opae/README
index b59242c5..86e6f862 100644
--- a/hw/opae/README
+++ b/hw/opae/README
@@ -62,6 +62,7 @@ make ase
 # tests
 ./run_ase.sh build_ase_1c ../../driver/tests/basic/basic
 ./run_ase.sh build_ase_1c ../../driver/tests/demo/demo
+./run_ase.sh build_ase_1c ../../benchmarks/opencl/vecadd/vecadd
 
 # modify "vsim_run.tcl" to dump VCD trace
 vcd file vortex.vcd
@@ -90,5 +91,6 @@ lsof +D build_ase_1c
 # quick off cache synthesis
 make -C pipeline > pipeline/build.log 2>&1 &
 make -C cache > cache/build.log 2>&1 &
+make -C core > core/build.log 2>&1 &
 make -C vortex > vortex/build.log 2>&1 &
 make -C top > top/build.log 2>&1 &
diff --git a/hw/opae/run_ase.sh b/hw/opae/run_ase.sh
index 9a0fbf64..9e3b5d6c 100755
--- a/hw/opae/run_ase.sh
+++ b/hw/opae/run_ase.sh
@@ -7,6 +7,9 @@ BUILD_DIR=$1
 PROGRAM=$(basename "$2")
 PROGRAM_DIR=`dirname $2`
 
+POCL_RT_PATH=$SCRIPT_DIR/../../benchmarks/opencl/runtime/lib
+VORTEX_DRV_PATH=$SCRIPT_DIR/../../driver/opae/ase
+
 # Export ASE_WORKDIR variable
 export ASE_WORKDIR=$SCRIPT_DIR/$BUILD_DIR/work
 
@@ -33,5 +36,5 @@ done
 # run application
 pushd $PROGRAM_DIR
 echo "  [DBG]  running ./$PROGRAM $*"
-ASE_LOG=0 LD_LIBRARY_PATH=../../opae/ase:$LD_LIBRARY_PATH ./$PROGRAM $*
+ASE_LOG=0 LD_LIBRARY_PATH=$POCL_RT_PATH:$VORTEX_DRV_PATH:$LD_LIBRARY_PATH ./$PROGRAM $*
 popd
\ No newline at end of file
diff --git a/hw/opae/sources.txt b/hw/opae/sources.txt
index 6058a31a..0263e558 100644
--- a/hw/opae/sources.txt
+++ b/hw/opae/sources.txt
@@ -67,6 +67,7 @@ QI:vortex_afu.qsf
 ../rtl/libs/VX_priority_encoder.v
 ../rtl/libs/VX_generic_queue.v
 ../rtl/libs/VX_indexable_queue.v
+../rtl/libs/VX_fair_arbiter.v
 ../rtl/libs/VX_fixed_arbiter.v
 ../rtl/libs/VX_rr_arbiter.v
 ../rtl/libs/VX_countones.v
diff --git a/hw/opae/sources_4c.txt b/hw/opae/sources_4c.txt
new file mode 100644
index 00000000..03959c74
--- /dev/null
+++ b/hw/opae/sources_4c.txt
@@ -0,0 +1,4 @@
++define+NUM_CORES=4
++define+L2_ENABLE=0
+
+C:sources.txt
\ No newline at end of file
diff --git a/hw/rtl/VX_alu_unit.v b/hw/rtl/VX_alu_unit.v
index c2fdee80..b0d0c20f 100644
--- a/hw/rtl/VX_alu_unit.v
+++ b/hw/rtl/VX_alu_unit.v
@@ -13,9 +13,6 @@ module VX_alu_unit (
     output reg [31:0]  alu_result,
     output reg         alu_stall
 );
-    localparam DIV_PIPELINE_LEN = 20;
-    localparam MUL_PIPELINE_LEN = 8;
-
     wire[31:0] div_result_unsigned;
     wire[31:0] div_result_signed;
 
@@ -37,11 +34,11 @@ module VX_alu_unit (
             `ALU_DIV,
             `ALU_DIVU,
             `ALU_REM,
-            `ALU_REMU:  inst_delay = DIV_PIPELINE_LEN;
+            `ALU_REMU:  inst_delay = `DIV_LATENCY;
             `ALU_MUL,
             `ALU_MULH,
             `ALU_MULHSU,
-            `ALU_MULHU: inst_delay = MUL_PIPELINE_LEN;
+            `ALU_MULHU: inst_delay = `MUL_LATENCY;
             default:    inst_delay = 0;
         endcase
     end
@@ -91,7 +88,7 @@ module VX_alu_unit (
         .WIDTHD(32),
         .NSIGNED(0),
         .DSIGNED(0),
-        .PIPELINE(DIV_PIPELINE_LEN)
+        .PIPELINE(`DIV_LATENCY)
     ) udiv (
         .clk(clk),
         .reset(reset),
@@ -106,7 +103,7 @@ module VX_alu_unit (
         .WIDTHD(32),
         .NSIGNED(1),
         .DSIGNED(1),
-        .PIPELINE(DIV_PIPELINE_LEN)
+        .PIPELINE(`DIV_LATENCY)
     ) sdiv (
         .clk(clk),
         .reset(reset),
@@ -124,7 +121,7 @@ module VX_alu_unit (
         .WIDTHB(33),
         .WIDTHP(64),
         .SIGNED(1),
-        .PIPELINE(MUL_PIPELINE_LEN)
+        .PIPELINE(`MUL_LATENCY)
     ) multiplier (
         .clk(clk),
         .reset(reset),
diff --git a/hw/rtl/VX_config.vh b/hw/rtl/VX_config.vh
index 0478a981..4f6377a0 100644
--- a/hw/rtl/VX_config.vh
+++ b/hw/rtl/VX_config.vh
@@ -8,7 +8,7 @@
 `endif
 
 `ifndef NUM_CORES
-`define NUM_CORES 1
+`define NUM_CORES 4
 `endif
 
 `ifndef NUM_WARPS
@@ -52,7 +52,7 @@
 `endif
 
 `ifndef L2_ENABLE
-`define L2_ENABLE (`NUM_CORES > 2)
+`define L2_ENABLE 0
 `endif
 
 `ifndef L3_ENABLE
diff --git a/hw/rtl/VX_define.vh b/hw/rtl/VX_define.vh
index b36c1751..3ddc4dff 100644
--- a/hw/rtl/VX_define.vh
+++ b/hw/rtl/VX_define.vh
@@ -72,6 +72,10 @@
 
 `define CSR_WIDTH   12
 
+`define DIV_LATENCY 18
+
+`define MUL_LATENCY 2
+
 ///////////////////////////////////////////////////////////////////////////////
 
 `define BYTE_EN_NO      3'h7 
diff --git a/hw/rtl/VX_lsu_unit.v b/hw/rtl/VX_lsu_unit.v
index 60a6e7b2..640640b3 100644
--- a/hw/rtl/VX_lsu_unit.v
+++ b/hw/rtl/VX_lsu_unit.v
@@ -116,7 +116,7 @@ module VX_lsu_unit #(
         end    
         if (mrq_pop_part) begin
             mem_rsp_mask[mrq_read_addr] <= mem_rsp_mask_upd;
-            assert(mrq_read_addr == dbg_mrq_write_addr);            
+            assert(($time < 2) || mrq_read_addr == dbg_mrq_write_addr);            
         end
     end
 
diff --git a/hw/rtl/libs/VX_fair_arbiter.v b/hw/rtl/libs/VX_fair_arbiter.v
index ca32a5fc..5ac5749e 100644
--- a/hw/rtl/libs/VX_fair_arbiter.v
+++ b/hw/rtl/libs/VX_fair_arbiter.v
@@ -11,7 +11,6 @@ module VX_fair_arbiter #(
     output wire                  grant_valid
   );
 
-
     if (N == 1)  begin        
         
         `UNUSED_VAR (clk)
@@ -20,8 +19,7 @@ module VX_fair_arbiter #(
         assign grant_onehot = requests;
         assign grant_valid  = requests[0];
 
-    end else begin
-    
+    end else begin    
 
        reg  [N-1:0] requests_use;
        wire [N-1:0] update_value;
@@ -48,7 +46,7 @@ module VX_fair_arbiter #(
         
         reg [N-1:0] grant_onehot_r; 
 
-        VX_priority_encoder # (
+        VX_priority_encoder #(
             .N(N)
         ) priority_encoder (
             .data_in   (requests_use),
@@ -61,7 +59,7 @@ module VX_fair_arbiter #(
             grant_onehot_r[grant_index] = 1;
         end
         assign grant_onehot = grant_onehot_r;    
-        assign late_value   =  ((refill_original ^ requests) & ~refill_original);
+        assign late_value   = ((refill_original ^ requests) & ~refill_original);
         assign update_value = (requests_use & ~grant_onehot_r) | late_value;
 
     end
diff --git a/hw/rtl/libs/VX_generic_queue.v b/hw/rtl/libs/VX_generic_queue.v
index 0c1fb742..52e12831 100644
--- a/hw/rtl/libs/VX_generic_queue.v
+++ b/hw/rtl/libs/VX_generic_queue.v
@@ -3,7 +3,7 @@
 module VX_generic_queue #(
     parameter DATAW,
     parameter SIZE = 16,
-    parameter BUFFERED_OUTPUT = (SIZE > 8)
+    parameter BUFFERED_OUTPUT = 1
 ) ( 
     input  wire             clk,
     input  wire             reset,
diff --git a/hw/simulate/Makefile b/hw/simulate/Makefile
index eba2d281..21814760 100644
--- a/hw/simulate/Makefile
+++ b/hw/simulate/Makefile
@@ -1,5 +1,5 @@
-#MULTICORE += -DNUM_CLUSTERS=2 -DNUM_CORES=4
-#MULTICORE += -DNUM_CLUSTERS=1 -DNUM_CORES=4
+#MULTICORE += -DNUM_CLUSTERS=2 -DNUM_CORES=4 -DL2_ENABLE=1
+#MULTICORE += -DNUM_CLUSTERS=1 -DNUM_CORES=4 -DL2_ENABLE=1
 MULTICORE += -DNUM_CLUSTERS=1 -DNUM_CORES=2
 
 # control RTL debug print states
@@ -12,7 +12,7 @@ DBG_PRINT_FLAGS += -DDBG_PRINT_DRAM
 DBG_PRINT_FLAGS += -DDBG_PRINT_PIPELINE  
 DBG_PRINT_FLAGS += -DDBG_PRINT_OPAE
 
-DBG_FLAGS += $(DBG_PRINT_FLAGS)
+#DBG_FLAGS += $(DBG_PRINT_FLAGS)
 DBG_FLAGS += -DDBG_CORE_REQ_INFO
 
 INCLUDE = -I../rtl/ -I../rtl/libs -I../rtl/interfaces -I../rtl/pipe_regs -I../rtl/cache -I../rtl/simulate
@@ -25,7 +25,7 @@ CF += -std=c++11 -fms-extensions -I../..
 
 VF += --language 1800-2009 --assert -Wall -Wpedantic
 VF += -Wno-DECLFILENAME
-VF += --x-initial unique
+VF += --x-initial unique --x-assign unique
 VF += -exe $(SRCS) $(INCLUDE)
 
 DBG += -DVCD_OUTPUT $(DBG_FLAGS)
diff --git a/hw/simulate/simulator.cpp b/hw/simulate/simulator.cpp
index 09a9b72c..2976a43c 100644
--- a/hw/simulate/simulator.cpp
+++ b/hw/simulate/simulator.cpp
@@ -9,13 +9,9 @@ double sc_time_stamp() {
   return timestamp;
 }
 
-Simulator::Simulator() {    
-
-#ifdef NDEBUG
+Simulator::Simulator() {  
   // force random values for unitialized signals  
   Verilated::randReset(2);
-  Verilated::assertOn(false);
-#endif
 
   ram_ = nullptr;
   vortex_ = new VVortex();
diff --git a/hw/syn/quartus/.gitignore b/hw/syn/quartus/.gitignore
index fedeee42..eac68fed 100644
--- a/hw/syn/quartus/.gitignore
+++ b/hw/syn/quartus/.gitignore
@@ -8,4 +8,7 @@
 !/vortex/Makefile
 
 /pipeline/*
-!/pipeline/Makefile
\ No newline at end of file
+!/pipeline/Makefile
+
+/core/*
+!/core/Makefile
diff --git a/hw/syn/quartus/core/Makefile b/hw/syn/quartus/core/Makefile
new file mode 100644
index 00000000..69ab23ab
--- /dev/null
+++ b/hw/syn/quartus/core/Makefile
@@ -0,0 +1,70 @@
+PROJECT = Core
+TOP_LEVEL_ENTITY = VX_core
+SRC_FILE = VX_core.v
+PROJECT_FILES = $(PROJECT).qpf $(PROJECT).qsf
+
+# Part, Family
+FAMILY = "Arria 10"
+DEVICE = 10AX115N3F40E2SG   
+
+# Executable Configuration
+SYN_ARGS = --parallel --read_settings_files=on
+FIT_ARGS = --part=$(DEVICE) --read_settings_files=on
+ASM_ARGS =
+STA_ARGS = --do_report_timing
+
+# Build targets
+all: $(PROJECT).sta.rpt
+
+syn: $(PROJECT).syn.rpt
+
+fit: $(PROJECT).fit.rpt
+
+asm: $(PROJECT).asm.rpt
+
+sta: $(PROJECT).sta.rpt
+
+smart: smart.log
+
+# Target implementations
+STAMP = echo done >
+
+$(PROJECT).syn.rpt: smart.log syn.chg $(SOURCE_FILES) 
+	quartus_syn $(PROJECT) $(SYN_ARGS)
+	$(STAMP) fit.chg
+
+$(PROJECT).fit.rpt: smart.log fit.chg $(PROJECT).syn.rpt
+	quartus_fit $(PROJECT) $(FIT_ARGS)
+	$(STAMP) asm.chg
+	$(STAMP) sta.chg
+
+$(PROJECT).asm.rpt: smart.log asm.chg $(PROJECT).fit.rpt
+	quartus_asm $(PROJECT) $(ASM_ARGS)
+
+$(PROJECT).sta.rpt: smart.log sta.chg $(PROJECT).fit.rpt
+	quartus_sta $(PROJECT)  $(STA_ARGS) 
+
+smart.log: $(PROJECT_FILES)
+	quartus_sh --determine_smart_action $(PROJECT) > smart.log
+
+# Project initialization
+$(PROJECT_FILES):
+	quartus_sh -t ../project.tcl -project $(PROJECT) -family $(FAMILY) -device $(DEVICE) -top $(TOP_LEVEL_ENTITY) -src $(SRC_FILE) -sdc ../project.sdc -inc "../../../rtl;../../../rtl/libs;../../../rtl/interfaces;../../../rtl/pipe_regs;../../../rtl/cache"
+	
+syn.chg:
+	$(STAMP) syn.chg
+
+fit.chg:
+	$(STAMP) fit.chg
+
+sta.chg:
+	$(STAMP) sta.chg
+
+asm.chg:
+	$(STAMP) asm.chg
+
+program: $(PROJECT).sof
+	quartus_pgm --no_banner --mode=jtag -o "$(PROJECT).sof"
+	
+clean:
+	rm -rf bin *.rpt *.chg *.qsf *.qpf *.qws *.log *.htm *.eqn *.pin *.sof *.pof qdb incremental_db tmp-clearbox
diff --git a/hw/syn/quartus/project.sdc b/hw/syn/quartus/project.sdc
index 3c588f3b..59686a41 100644
--- a/hw/syn/quartus/project.sdc
+++ b/hw/syn/quartus/project.sdc
@@ -1,6 +1,6 @@
 set_time_format -unit ns -decimal_places 3
 
-create_clock -name {clk} -period "250 MHz" -waveform { 0.0 1.0 } [get_ports {clk}]
+create_clock -name {clk} -period "200 MHz" -waveform { 0.0 1.0 } [get_ports {clk}]
 
 derive_pll_clocks -create_base_clocks
 derive_clock_uncertainty