Abstract: A method for communication within a multicore system which includes a primary programmable logic device (PLD) and a secondary PLD installed respectively on a primary motherboard and a secondary motherboard includes steps of: A) by the primary PLD, determining whether the primary motherboard is connected to the secondary motherboard; B) by the primary PLD, after determining that the primary motherboard is connected to the secondary motherboard, sending a reply-requesting signal to the secondary PLD; C) by the secondary PLD, after receiving the reply-requesting signal, sending a reply signal corresponding to the reply-requesting signal to the primary PLD; D) by the primary PLD, after receiving the reply signal, sending an instruction to the secondary PLD; and E) by the secondary PLD, after receiving the instruction, performing an operation corresponding to the instruction.