Method and apparatus for border node behavior on a full-duplex bus
First Claim
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1. In a serial bus communications system, a method for determining whether a BOSS node may issue a grant for a pipelined Beta request comprising:
- providing a first and second indicator; and
issuing a grant for a pipelined Beta request by the BOSS only when both said first and second indicators are set.
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Abstract
A method and apparatus relating to the behavior of border nodes within a high performance serial bus system is disclosed.
A method for determining and communicating the existence of a hybrid bus is disclosed. A method for determining a path to a senior border node is disclosed, as is a method for identifying a senior border node Various methods for properly issuing gap tokens within a beta cloud are disclosed.
A method for returning control to the senior border node is disclosed. A method for determining whether a BOSS node may issue a grant is disclosed.
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Citations
14 Claims
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1. In a serial bus communications system, a method for determining whether a BOSS node may issue a grant for a pipelined Beta request comprising:
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providing a first and second indicator; and
issuing a grant for a pipelined Beta request by the BOSS only when both said first and second indicators are set. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
setting said second indicator after the end of an isochronous packet. resetting said second indicator during a first quiet time;
setting said second indicator momentarily after said first quiet time;
resetting said second indicator during a second quiet time; and
setting said second indicator after said second quiet time.
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6. The method of claim 1, wherein said system is a hybrid bus and there has not been an end of subaction, said method further comprising the acts of:
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resetting said second indicator after the end of an asychronous packet;
resetting said second indicator during a first quiet;
setting said second indicator momentarily after said first quiet time;
resetting said second indicator during a second quiet time; and
setting said second indicator after said second quiet time.
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7. The method of claim 1, wherein said system comprises a beta-only system and there has been an end of an asynchronous packet;
- said method further comprising the acts of;
setting said second indicator after the end of an asynchronous packet.
- said method further comprising the acts of;
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8. The method of claim 1, wherein said system comprises a beta-only system and there has not been an end of subaction;
- said method further comprising the acts of;
resetting said second indicator after the end of an asynchronous packet for a predetermined amount of time; and
setting said indicator thereafter.
- said method further comprising the acts of;
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9. The method of claim 2 wherein said predetermined amount of time is sufficient for said BOSS node to determine that an acknowledge packet is missing.
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10. The method of claim 1, wherein said system is a hybrid bus and there has been an end of subaction, said method further comprising the acts of:
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setting said second indicator after the end of an asynchronous packet;
resetting said second indicator during a second quiet time; and
setting said second indicator after said second quiet time.
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11. The method of claim 1 wherein said first indicator is reset when said BOSS receives a packet from a P1394b-compliant port.
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12. The method of claim 1 wherein said first indicator is reset when said BOSS issues either an explicit or implicit grant.
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13. In a serial bus communications system, a method for determining whether a BOSS node may issue a grant for a Legacy request comprising:
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providing a first indicator; and
issuing a grant for the Legacy request by the BOSS only if said first indicator is set. - View Dependent Claims (14)
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Specification