Abstract: A data access device for a communication system includes: a write controller controlled by the host and outputting a write pointer; a read controller controlled by the write pointer and outputting a read pointer; a download timing controller comparing the write and read pointers to determine a timing of downloading data from the host, and including a pointer difference calculator and a comparator, the pointer difference calculator calculating a distance between the write and read pointers to obtain a pointer difference, the comparator outputting a download status indication according to the pointer difference and a first predetermined length to provide a basis for changing the write pointer; and a transmit buffer downloading data from the host according to the write pointer and transmitting data to the network interface according to the read pointer. A data access device for a network interface controller and a data access method are also disclosed.

Abstract: A memory access apparatus is coupled to a memory unit and includes a header access circuit and a payload access circuit. The header access circuit includes a header fetching unit used to fetch a header descriptor in the memory unit, and the payload access circuit includes a payload fetching unit used to fetch a payload descriptor in the memory unit. The header access circuit and the payload access circuit perform fetching with respect to the memory unit in a non-sequenced manner.

Abstract: A data access device for a communication system includes: a write controller controlled by the host and outputting a write pointer; a read controller controlled by the write pointer and outputting a read pointer; a download timing controller comparing the write and read pointers to determine a timing of downloading data from the host, and including a pointer difference calculator and a comparator, the pointer difference calculator calculating a distance between the write and read pointers to obtain a pointer difference, the comparator outputting a download status indication according to the pointer difference and a first predetermined length to provide a basis for changing the write pointer; and a transmit buffer downloading data from the host according to the write pointer and transmitting data to the network interface according to the read pointer. A data access device for a network interface controller and a data access method are also disclosed.