REG_FIFO_ELEMENT_DWORDS
len = REG_FIFO_ELEMENT_DWORDS;
dwords_read += REG_FIFO_ELEMENT_DWORDS) {
(REG_FIFO_ELEMENT_DWORDS * REG_FIFO_DEPTH_ELEMENTS)
if (param_num_val % REG_FIFO_ELEMENT_DWORDS)
num_elements = param_num_val / REG_FIFO_ELEMENT_DWORDS;