diff --git a/raven_spn/src/raven_spn.cpp b/raven_spn/src/raven_spn.cpp
index 30d50ae..382365c 100644
--- a/raven_spn/src/raven_spn.cpp
+++ b/raven_spn/src/raven_spn.cpp
@@ -54,7 +54,6 @@ void configure_irq(size_t irq_num, function_ptr_t handler, unsigned char prio=1)
 }
 
 static void msi_interrupt_handler(){
-    int * local_mem_base = (int *) 0x80000100;
     printf("INterrupt handler call\n");
 }
 
@@ -89,52 +88,56 @@ bool double_equals(double a, double b, double epsilon = 0.001)
     return std::abs(a - b) < epsilon;
 }
 
+void run_xspn() {
+	printf("Start SPN HW accelerator\n");
+
+	spn::mode_reg() = 0;
+	spn::input_length_reg() = 100; 		// each sample consists of 5 uint8 values
+	spn::input_addr_reg() = 0x80001000;
+	spn::output_addr_reg() = 0x80002000;
+	spn::num_of_in_beats_reg() = 8;		// Number of AXI4 burst beats needed to load all input data
+	spn::num_of_out_beats_reg() = 13;	// Number of AXI4 burst beats needed to store all result data
+	spn::start_reg() = 1;
+	delayUS(50);
+	printf("Cycle count:%d\n", spn::start_reg());
+	spn::interrupt_reg() = 1;
+}
 
 /*! \brief main function
  *
  */
 int main() {
     platform_init();
-
-    // write input samples into the memory
-    int * mem_base = (int *) 0x80001000;
-
-    for(size_t i = 0, j = 0; j < 19; i += 4, j++) {
-    	*(mem_base+j) = input_data.at(i);
-    	*(mem_base+j) |= input_data.at(i+1) << 8;
-    	*(mem_base+j) |= input_data.at(i+2) << 16;
-    	*(mem_base+j) |= input_data.at(i+3) << 24;
-    }
-
-    ////////////////////////////////////////////////
     spn::mode_reg() = 1;
     spn::start_reg() = 1;
     printf("READOUT HW:0x%x\n", spn::readout_reg());
     spn::interrupt_reg() = 1;
 
-    printf("Start SPN HW accelerator\n");
-    spn::mode_reg() = 0;
-    spn::input_length_reg() = 15;
-    spn::input_addr_reg() = 0x80001000;
-    spn::output_addr_reg() = 0x80001000;
-    spn::num_of_in_beats_reg() = 2;
-    spn::num_of_out_beats_reg() = 2;
-    spn::start_reg() = 1;
+	for (int k = 0; k < 200; k+=100) {
+        // write input samples into the memory
+        int * mem_base = (int *) 0x80001000;
+        int offset = k * 5;
 
-    delayUS(50);
-    printf("Cycle count:0x%x\n", spn::start_reg());
-    spn::interrupt_reg() = 1;
-    delayUS(10);
-
-    // read calculation results from the memory
-    double * res_base = (double*)mem_base;
-
-    for (int i = 0; i < 15; i++) {
-        if (double_equals(res_base[i] * ln2, ref_data.at(i))) {
-            printf("XSPN ref %d comparison PASSED\n", i);
-        } else {
-            printf("XSPN ref %d comparison FAILED\n", i);
+        for(size_t i = 0, j = 0; j < 125; i += 4, j++) {
+        	*(mem_base+j) = input_data.at(offset+i);
+        	*(mem_base+j) |= input_data.at(offset+i+1) << 8;
+        	*(mem_base+j) |= input_data.at(offset+i+2) << 16;
+        	*(mem_base+j) |= input_data.at(offset+i+3) << 24;
         }
+
+    	run_xspn();
+
+    	// read calculation results from the memory
+        double * res_base = (double*) 0x80002000;
+
+        for (int i = 0; i < 100; i++) {
+            if (double_equals(res_base[i] * ln2, ref_data.at(k+i))) {
+//                printf("XSPN ref %d comparison PASSED\n", k+i);
+            } else {
+                printf("XSPN ref %d comparison FAILED\n", k+i);
+            }
+    	}
+
 	}
 
 	return 0;