AXI slave Response Buffer Depth can be set to one of 1,2,4,8, or 16 entries. The default is 8 entries. This parameter changes the number of entries in the read response buffer. Each entry in the read response buffer stores read data bits along with error control and ID bits. Note that the selection of this parameter only applies to Read Response channel. The depth of AXI slave write response buffer is not configurable and is set to 16 entries.