refind read/write bulk function
// BRAM stays in local FPGA
// When HT_ENTRY_NUM = (1<<21), it costs 2Mbits
-#define WIDTH_EXP 7
+#define WIDTH_EXP 9
#define BRAM_WIDTH (1<<WIDTH_EXP)
static ap_uint<BRAM_WIDTH> hash_used[HT_ENTRY_NUM/BRAM_WIDTH];
