Bus system providing dynamic control of pipeline depth for a mul

Details Bus system providing dynamic control of pipeline depth for a mul Bus system providing dynamic control of pipeline depth for a mul

1997-06-06

1998-06-02

Ray, Gopal C.

395670, 39580041, G06F 938, G06F 1342

Patent

active

057614490

ABSTRACT:
A bus system for a computer having multiple agents provides a mechanism for unilaterally and dynamically limiting the pipelining depth. Each agent includes a state machine which indicates whether the bus is in a throttled state, a stalled state or a free state. When in a free state, an agent having control of the bus may transmit any number of bus transactions and the depth of the pipeline may therefore increase. In the throttled state, the agent may transmit only a single bus transaction from the throttled state. The state machine always transitions either to the stalled state or to the free state. In the stalled state, no agents may transmit transactions onto the bus and the depth of the pipeline therefore cannot increase and instead may decrease with time as previously issued transactions are drained from the bus.

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