Memory access arbitration circuit

Abstract

Abstract PURPOSE:To easily prepare firmware in the case a request signal is received from one processor, by sending no permission signal when another request signal is received from another processor and stopping a permission signal being sent when a reset signal is received from the another processor. CONSTITUTION:A permitting means 4 prevents an access conflict to a between processors 2 and 3 and is initialized by a reset signal to stop the sending of a permission signal. The processors 2 and 3 are initialized by the reset signal and stop the sending of request signals. When the request signal is sent to the permitting means 4 and one of the processors 2 and 3 receives the permission signal, the processor which receives the permission signal can gain the access to the memory 1, since the sending of the permission signal to the processors 2 and 3 is stopped due to the initialization. Therefore, when firmware is prepared for instructing the operations of the processors 2 and 3, the firmware can be prepared easily, because it is not necessary to consider about flag erasure.

Inventors

• 👤 Toshiaki Kakimi
• 👤 垣見　利明

Bibliographic Details