Shared memory access controller
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United States of America Patent
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Jun 22, 2004
Grant Date -
N/A
app pub date -
Jun 5, 2000
filing date -
Nov 13, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A communication system comprises an input-output processor IOP (11) coupled to a plurality of network devices (10) and a protocol processor PP (12), both processors being coupled to a common memory (15). Memory access control means (16) resolves competition between the processors for memory access. Normally, if one of the two processors is accessing the memory, the memory control unit (16) allows that access to be completed before allowing the other processor to access the memory. But if data loss in a network device is imminent, the IOP, is granted a higher priority memory access, the memory access controller aborts (interrupts) any memory access by the PP, allowing the IOP to access the memory immediately.
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