Architecture to fragment transmitted TCP packets to a requested window size

A circuit for implementing transmission control protocol segmentation on a data payload to be transmitted over a network, said circuit comprising:

• a first circuit portion coupled to receive a descriptor from a host device for said data payload stored within a host memory to be transmitted over said network, as part of said transmission control protocol segmentation said first circuit portion uses said descriptor to request download of payload header data and data segments of said data payload from said host memory;
• and
• a second circuit portion coupled to receive said payload header data and data segments of said data payload from said host memory, wherein said second circuit portion repeatedly modifies said payload header data to generate frame headers which correspond to said data segments.