Back-off timing mechanism

Details Back-off timing mechanism Back-off timing mechanism

2007-10-30

2007-10-30

Auve, Glenn A. (Department: 2111)

Electrical computers and digital data processing systems: input/

Intrasystem connection

Bus access regulation

C710S310000, C713S400000

Reexamination Certificate

active

11100081

ABSTRACT:
Systems and methods for implementing back-off timing for retries of commands sent from a master device to a slave device over a split-transaction bus. One embodiment includes a buffer having entries for storing each pending command and associated information, including a number of retries of the command and a static pseudorandom timer expiration value. The timer expiration value of each entry is compared to a running counter according to a mask associated with the number of retries of the command corresponding to the entry. When the unmasked bits of the two values match, the command is retried. In one embodiment, the same portion of the buffer entry that is used to store the number of retries and the timer expiration value is alternately used to store a slave-generated tag that is received with an acknowledgment response.

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