Back pressure access control system for a shared buffer with allocation threshold for each traffic class
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United States of America Patent
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Nov 17, 1998
Grant Date -
N/A
app pub date -
Jun 7, 1996
filing date -
Jun 9, 1995
priority date (Note) -
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Abstract
An improved access control system for a memory system in which memory locations can be allocated to virtual output queues dedicated to output ports from the system. The virtual queues can be used to handle data of different priorities. Thresholds are defined for the occupancy of the overall memory and of each virtual queue. The access control system regulates the acceptance of data stored in input adapters by determining whether a back pressure situation exists for the data's target output adapter for the class of traffic to which the data belongs. A single-bit access-controlling back pressure signal is generated as a function of the occupancy level of either the overall memory or of the virtual queue defined for the target output adapter.
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