PROGRAMMABLE LOGIC DEVICE AND PROGRAMMING METHOD

摘要

Before logic setting data for a programmable logic device (PLD) is transferred from a memory, pin setting data for defining the initial state of an external pin of the PLD is transferred to set all the external pins. The unstable state is prevented from being propagated to logic circuits around the PLD. The logic setting data is divided into minimum logic setting data for defining functions necessary for the stable operation of the system and complete logic setting data for defining all the functions including the other functions. The former data is preferentially transferred, and thereby the period during which the PLD is unstable at the system start-up, solving the unstability at the start-up when the device is assembled into an existing system.