Content-addressable memory implemented with a memory management

Details Content-addressable memory implemented with a memory management Content-addressable memory implemented with a memory management

1997-10-01

2000-02-15

Cabeca, John W.

Electrical computers and digital processing systems: memory

Storage accessing and control

Specific memory composition

711205, 711207, G06F 1200

Patent

active

060264675

ABSTRACT:
A content-addressable memory (CAM) is implemented by using otherwise-unused memory management unit (MMU 102) and cache memories (104, 105) of a program-controlled microprocessor (100). A program stored in an instruction cache (104) and executed by the microprocessor causes the microprocessor to respond to receipt of a word of data (200), which is illustratively the VPI/VCI of an ATM network connection, by applying the most-significant bits (MSBs 202) of the received word as a comparand to tags (203) of entries (206) of a fully-associative translation buffer (103) of the MMU to obtain an index (204) indicative of which translation buffer entry's corresponding tag matches the comparand. The program further causes the microprocessor to respond to obtaining of the index by concatenating the index with the least-significant bits (LSBs 201) of the received word to form a memory address of a data cache (105) which stores a plurality of records (210) and apply the address to the data cache to retrieve the addressed record, which is illustratively the path of the connection through the ATM network. Entries may be added to and deleted from the translation buffer during processing as needed.

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