US4488260A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Associative access-memory
Assignee: BBC Brown Boveri AG Germany
•
Filing: 1982-02-12
•
Granted: 1984-12-11
•
Expires: 2002-02-12
Abstract
Abstract Associative access-memory, including flip-flops as memory cells being disposed in a matrix having m rows and n columns and each having an input, an output and a dynamic input, each of the rows serving to accept an n-bit-wide memory word and to store m memory words, EXNOR members each being associated with one flip-flop and each having first and second inputs and an output, n memory inputs disposed in columns, the input of each flip-flop and the first input of the EXNOR member associated therewith being connected to a respective one of the n memory inputs, the output of each flip-flop being connected to the second input of the EXNOR member associated therewith, m memory inputs disposed in rows, the dynamic input of each flip-flop being connected to a respective one of the m memory inputs, m bus lines disposed in rows, the output of each EXNOR member being connected to a respective one of the bus lines, and voltage sources each being connected to one of the bus lines.
Inventors
- 👤 Pierre Cantarel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:34
CPC Classifications
G; G11; G11C; G11C15/00; G11C15/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
170 words
Associative access-memory, comprising flip-flops as memory cells being disposed in a matrix having m rows and n columns and each having an input, an output and a dynamic input, each of the rows serving to accept an n-bit-wide memory word and to store m memory words, EXNOR members each being associated with one flip-flop and each having first and second inputs and an output, n memory inputs disposed in columns, said input of each flip-flop and said first input of said EXNOR member associated therewith being connected to a respective one of said n memory inputs, said output of each flip-flop being connected to said second input of said EXNOR member associated therewith, m memory inputs disposed in rows, said dynamic input of each flip-flop being connected to a respective one of said m memory inputs, m bus lines disposed in rows, said output of each EXNOR member being connected to a respective one of said bus lines, and voltage sources each being connected to one of said bus lines.
Claim 2
Dependent Claim
170 words
Associative access-memory, comprising flip-flops as memory cells being disposed in a matrix having m rows and n columns and each having an input, an output and a dynamic input, each of the rows serving to accept an n-bit-wide memory word and to store m memory words, EXNOR members each being associated with one flip-flop and each having first and second inputs and an output, n memory inputs disposed in columns, said input of each flip-flop and said first input of said EXNOR member associated therewith being connected to a respective one of said n memory inputs, said output of each flip-flop being connected to said second input of said EXNOR member associated therewith, m memory inputs disposed in rows, said dynamic input of each flip-flop being connected to a respective one of said m memory inputs, m bus lines disposed in rows, said output of each EXNOR member being connected to a respective one of said bus lines, and voltage sources each being connected to one of said bus lines.
Claim 3
Dependent Claim
43 words
Associative access-memory according to claim 1, including isolating stages dividing said bus lines into bus line sections, each of said isolating stages having a control input, and said voltage sources including a separate voltage source connected to each of said bus line sections.
Claim 4
Dependent Claim
26 words
Associative access-memory according to claim 1, including a decoder connected to said memory inputs disposed in rows, for translating a memory address for the respective row.
Claim 5
Dependent Claim
52 words
Associative access-memory according to claim 3, including an encoder connected to said bus lines, for selecting the memory address, an output for said encoder, a buffer circuit connected to said output of said encoder, and address inputs and outputs for said decoder and buffer circuit for entering and reading out memory addresses.
Claim 6
Dependent Claim
19 words
Associative access-memory according to claim 4, including control inputs for said buffer circuit for switching between reading and writing.
Claim 7
Dependent Claim
30 words
Associative access-memory according to claim 1, including an intermediate memory connected to said memory inputs disposed in columns, for entering a memory word to be stored or a target word.
Claim 8
Dependent Claim
19 words
Associative access-memory according to claim 1, including an encoder connected to said bus lines, for selecting the memory addresses.
Claim 9
Dependent Claim
54 words
Associative access-memory according to claim 7, including an intermediate memory connected to said memory inputs disposed in columns, for entering a memory word to be stored or a target word, and an indicator output for said encoder, indicating coincidence between a written-in memory word and a target word being entered through said intermediate memory.
Claim 10
Dependent Claim
27 words
Associative access-memory according to claim 7 or 8, including a buffer output for said encoder, and a buffer circuit connected to said buffer output of said encoder.
Claim 11
Dependent Claim
23 words
Associative access-memory according to claim 6 or 8, including operating inputs for said intermediate memory, for switching between word and byte-wise writing in.
References Cited (Backward Citations)
US3388382A
Cited
US3761902A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-11 | 1988-06-11 | 1988-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-11 | 1992-06-11 | 1992-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-11 | 1996-06-11 | 1996-12-11 | $7700.00 | Window Closed / Lapsed |