Message request method and device thereof

The integrated circuit implements a message request device, applicable to a USB multi-port electronic device, the USB multi-port electronic device comprising N type-C ports and an integrated circuit, and the message request device comprising:

• a classifier, configured to receive a message, and assign, according to a port identifier of the message, the message to a corresponding message pending queue of N message pending queues;
• a message scheduler, configured to select, according to a largest message pending first algorithm, a message pending queue with a maximum quantity of messages from the N message pending queues, and obtain a queue identifier corresponding to the message pending queue, the queue identifier being in a one-to-one correspondence with the port identifier;
• and a message egress port, signally connected to the message scheduler, the message scheduler being configured to extract the message from the message pending queue corresponding to the queue identifier, and deliver, through the message egress port, the message to a policy engine of a type-C port corresponding to the queue identifier, to make a request for the message;
• wherein before the step of assigning the message to the corresponding message pending queue of the N message pending queues, further comprising:
• first determining whether the message pending queue is full, and assigning the message to the message pending queue when the message pending queue is not full.