Method of accessing memory via multiple slave ports

Details Method of accessing memory via multiple slave ports Method of accessing memory via multiple slave ports

2007-02-27

2007-02-27

Dang, Khanh (Department: 2111)

Electrical computers and digital data processing systems: input/

Input/output data processing

Direct memory accessing

C710S244000, C710S317000

Reexamination Certificate

active

11203935

ABSTRACT:
A crossbar switch (12) arbitrates for access from multiple bus masters (14, 16, 18, 20and22) to multiple addressed slave ports (3and4) that have overlapping address ranges. In one form, the address ranges are the same address range. The crossbar switch (12) uses shared slave port control circuitry (48), configuration registers (46) and slave port arbiter logic (34, 36, 38, 40, 42and44) to arbitrate for access when all the addressed ports are busy. A determination is made as to whether new access requests are higher or lower in priority than existing accesses. A determination on where to direct a new access request is made based upon a prediction of which of certain multiple accesses will complete first based on various factors including the number of data beats requested as well as wait state information. In one mode, the wait state information is determined dynamically.

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