Introduction - If you have any usage issues, please Google them yourself
8 bit shift register with synchronous parallel preset function. The principle of work when the rising edge of CLK when the process is started, if the preset enable LOAD to a high level, the 8 bit binary number will be in the input port of the parallel shift register, serial output shift as the initial value if LOAD is low, then the statement is d:
Reg8 (6 downto) < reg8 (7 downto 1)