The BIU in 8088 is 8-bit data bus & 16- bit in 8086.Instruction queue is 4 byte long in 8088and 6 byte in 8086.
8088 is that processor.
Execution Unit receives program instruction codes and data from BIU, executes these instructions and store the result in general registers.
Trace Flag, Interrupt Flag, Direction Flag.
Stack Segment in segment register is used to store interrupt and subroutine return address registers.