Universal serial bus device and host

A universal serial bus (USB) host, comprising:

• a storage device, comprising a plurality of endpoint buffers, wherein the plurality of endpoint buffers are configured to store a plurality of output packets to be transmitted to a USB device, wherein the plurality of output packets are received by a plurality of cores of a central processing unit external to the USB device,
• wherein each of the plurality of output packets has a first identifier corresponding to one of the plurality of cores;
• and
• a controller, configured to allocate the plurality of output packets to the plurality of endpoint buffers according to the plurality of first identifiers for storage,
• wherein the output packets with the same first identifier are stored in a same endpoint buffer.

A universal serial bus (USB) host, comprising:

• a storage device, comprising a plurality of endpoint buffers, wherein the plurality of endpoint buffers are configured to store a plurality of input packets received from a USB device, wherein each of the plurality of input packets has a first identifier corresponding to one of a plurality of cores of a central processing unit external to the USD device;
• and
• a controller, configured to assign the plurality of input packets to the plurality of cores according to the plurality of first identifiers,
• wherein the plurality of first identifiers are stream identifiers.