Data structure access control circuit and method utilizing tag b

Details Data structure access control circuit and method utilizing tag b Data structure access control circuit and method utilizing tag b

1994-03-03

1996-01-16

Gossage, Glenn

Boots, shoes, and leggings

395650, 395474, 364DIG1, G06F 1318

Patent

active

054855934

ABSTRACT:
A method and circuit utilizing first and second tag bits for granting access to a block of memory in a multiprocessor system having a shared memory are provided. When a memory request for exclusive access to a block of memory is granted, the starting address for that block of memory is placed in a register bank, thereby opening a semaphore. The starting address of a memory block of a subsequent memory access request is compared with the starting addresses corresponding to open semaphores within the register bank and access is denied to the requested block of memory if a match is found. The starting address associated with a request which is denied access is placed in a temporary buffer and the request is later granted access after the corresponding open semaphore becomes closed. A request which is granted memory access to a memory block which results in an open semaphore, has exclusive access to that block of memory until the semaphore is closed.

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