Patent ID: 6711179
Filing Date: 2004-03-23
Classification: H04L

Abstract:
A signal processing apparatus comprising an upper layer processing section, an intermediate layer processing section, and a lower layer processing section, said signal processing apparatus transmitting transfer data from said upper layer processing section via said intermediate layer processing section to said lower layer processing section, thereafter, transmitting the transfer data from said lower layer processing section to a destination apparatus via a bus, receiving a response signal sent from said destination apparatus in response to the transfer data at said lower layer processing section, and transmitting the received response signal via said intermediate layer processing section to said upper layer processing section,wherein said lower layer processing section comprises a first storage unit having a first memory capacity of a predetermined limited size for transfer data, said first storage unit temporarily storing transfer data upon transmitting the transfer data via said bus, wherein said intermediate layer processing section comprises a second storage unit having a second memory capacity larger than the limited size for transfer data, said second storage unit temporarily storing the transfer data upon receiving the transfer data from said upper layer processing section and transferring the received transfer data to said lower layer processing section, wherein said upper layer processing section transmits the transfer data of a size, which is larger than the first memory capacity which is equal to or smaller than the second memory capacity, to said intermediate layer processing section, wherein said intermediate layer processing section receives the transfer data transmitted from said upper layer processing section, divides the transfer data into a plurality of divided data each having a size equal to or smaller than the limited size for transfer data, and transmits the divided data to said lower layer processing section, and wherein when there is untransmitted divided data upon receiving the response signal from said lower layer processing section, said intermediate layer processing section transmits the untransmitted divided data to said lower layer processing section without transmitting any response signal to said upper layer processing section.