| 摘要 |
<p>Provided is a digital electronic system for controlling conflicting users (23, 24) of a shared resource (25) such as a data bus (53) in a digital computer. The system includes cross-coupled state machines (21, 22) that permit a respective user, such as a DRAM memory bank (51, 52), to proceed with exclusive use of the shared resource as soon as any other user is finished with the shared resource. Possible contention due to the cross-coupling of the state machines is prevented by priority logic (20) that arbitrates between requests for the services of different users. Each state machine arbitrates among simultaneous requests for the services of its user by governing transitions from an idle state to a respective sequence of states for each kind of request. Sequencing through each sequence of states is responsive to a respective grant signal from the priority logic and the busy signals of the other state machines.</p> |
