Data length control of access to a data bus

In a bus system for transferring data in the form of multibyte data streams, said bus system having at least one bus, said at least one bus coupled to a plurality of data transfer agents, said data transfer agents requesting access to said bus to transfer data thereon, a system for controlling access to said at least one bus, comprising:

• a bus arbiter coupled to said at least one bus, responsive to said access requests of said plurality of data transfer agents, granting access to said bus to one of said plurality of data transfer agents for transferring data thereon;
• a data length counter, accumulating, during said grant of access of said bus arbiter, signals indicating the length of said data transferred between said bus and said data transfer agent, and indicating transfer completion of an initialized length of data;
• and
• bus arbiter logic coupled to said data length counter and said bus arbiter, initializing said data length counter with a length of data to be transferred;
• changing control of deassertion of said grant of access based on a frame signal, to said initialized length of data and a frame signal;
• responsive to said data length counter indicating said transfer completion of said initialized length of data, causing said bus arbiter to terminate said grant of access to said data transfer agent.

A bus system for controlling the transfer of data in the form of multibyte data streams, comprising:

• at least one bus;
• a plurality of data transfer agents coupled to said at least one bus, said data transfer agents requesting access to said bus to transfer data thereon;
• a bus arbiter coupled to said at least one bus, responsive to said access requests of said plurality of data transfer agents, granting access to said bus to one of said plurality of data transfer agents for transferring data thereon;
• a data length counter, accumulating, during said grant of access of said bus arbiter, signals indicating the length of said data transferred between said bus and said data transfer agent, and indicating transfer completion of an initialized length of data;
• and
• bus arbiter logic coupled to said data length counter and said bus arbiter, initializing said data length counter with a length of data to be transferred;
• changing control of deassertion of said grant of access based on a frame signal, to said initialized length of data and a frame signal;
• responsive to said data length counter indicating said transfer completion of said initialized length of data, causing said bus arbiter to terminate said grant of access to said data transfer agent.