Merge pull request #308 from pulp-platform/lv/axi_scoreboard_minor_fix

`axi_scoreboard`: avoid false negs for mem-mapped misaligned reads.

src/axi_test.sv

@@ -2046,6 +2046,7 @@ package axi_test;
  byte_t act_data;
  byte_t exp_data[$];
  byte_t tst_data[$];
+ int first_byte_to_check;
  forever begin
  wait (this.ar_sample[id].size() > 0);
  ar_beat = this.ar_sample[id].pop_front();
@@ -2060,6 +2061,10 @@ package axi_test;
  ar_beat.ax_burst, i);
  beat_address = axi_pkg::aligned_addr(beat_address, ar_beat.ax_size);
  bus_address = axi_pkg::aligned_addr(beat_address, BUS_SIZE);
+ if(i!=0)
+ first_byte_to_check = 0;
+ else
+ first_byte_to_check = ar_beat.ax_addr - beat_address;
  if (!this.memory_q.exists(bus_address)) begin
  for (int unsigned j = 0; j < axi_pkg::num_bytes(BUS_SIZE); j++) begin
  this.memory_q[bus_address+j].push_back(8'bxxxxxxxx);
@@ -2068,7 +2073,7 @@ package axi_test;
  // Assert that the correct data is read.
  if (this.check_en[ReadCheck] &&
  (r_beat.r_resp inside {axi_pkg::RESP_OKAY, axi_pkg::RESP_EXOKAY})) begin
- for (int unsigned j = 0; j < axi_pkg::num_bytes(ar_beat.ax_size); j++) begin
+ for (int unsigned j = first_byte_to_check; j < axi_pkg::num_bytes(ar_beat.ax_size); j++) begin
  idx_data = 8*BUS_SIZE'(beat_address+j);
  act_data = r_beat.r_data[idx_data+:8];
  exp_data = this.memory_q[beat_address+j];