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US4855958A
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Semiconductor integrated circuit device having logic macro and random access memory macro
Assignee: Fujitsu Ltd
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Filing: 1988-08-17
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Granted: 1989-08-08
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Expires: 2008-08-17
Abstract
Abstract A semiconductor integrated circuit device has a logic macro and RAM macros, and each RAM macro has a plurality of latch circuits, an operation circuit and a memory cell array. At least one of outputs of the latch circuits within the RAM macro is coupled to the operation circuit thereof by a first interconnection when the RAM macro is used. When the RAM macro is not used, all of the outputs of the latch circuits are coupled to certain internal cells of the logic macro by a second interconnection. The first and second interconnections are determined by a function to be carried out in the circuit device, that is, designed by CAD, for example, depending on the kind or model of the circuit device.
Inventors
- 👤 Motohisa Ikeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:31
CPC Classifications
G; G11; G11C; G11C7/00; G11C7/10; G11C7/1006; G11C5/00; G11C5/02; G11C5/025; Y; Y10; Y10S; Y10S257/00; Y10S257/923
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
162 words
A semiconductor integrated circuit device comprising: a semiconductor chip; a logic macro provided on said semiconductor chip, said logic macro having a plurality of internal cells; and a plurality of random access memory macros provided on said semiconductor chip, each of said random access memory macros having a latch circuit group including a plurality of latch circuits with inputs coupled to outputs of predetermined ones of the internal cells of said logic macro by fixed interconnections, an operation circuit and a memory cell array coupled to the operation circuit, at least a first random access memory macro out of said random access memory macros having outputs of all of the latch circuits thereof coupled to the operation circuit thereof by a first interconnection, at least a second random access memory macro out of said random access memory macros having an output of at least one of the latch circuits coupled to certain internal cells of said logic macro by a second interconnection.
Claim 2
Dependent Claim
162 words
A semiconductor integrated circuit device comprising: a semiconductor chip; a logic macro provided on said semiconductor chip, said logic macro having a plurality of internal cells; and a plurality of random access memory macros provided on said semiconductor chip, each of said random access memory macros having a latch circuit group including a plurality of latch circuits with inputs coupled to outputs of predetermined ones of the internal cells of said logic macro by fixed interconnections, an operation circuit and a memory cell array coupled to the operation circuit, at least a first random access memory macro out of said random access memory macros having outputs of all of the latch circuits thereof coupled to the operation circuit thereof by a first interconnection, at least a second random access memory macro out of said random access memory macros having an output of at least one of the latch circuits coupled to certain internal cells of said logic macro by a second interconnection.
Claim 3
Dependent Claim
41 words
A semiconductor integrated circuit device as claimed in claim 1 in which said first and second interconnections are determined by a function to be carried out by said semiconductor integrated circuit device, said fixed interconnections being fixed regardless of said function.
Claim 4
Dependent Claim
53 words
A semiconductor integrated circuit device as claimed in claim 1 in which both said first and second random access memory macros carry out a random access memory function, remaining ones of the latch circuits of said second random access memory macro having outputs coupled to the operation circuit thereof by said second interconnection.
Claim 5
Dependent Claim
54 words
A semiconductor integrated circuit device as claimed in claim 3 in which an input of the operation circuit of said second random access memory macro corresponding to said one of the latch circuits coupled to the certain internal cells of said logic macro by said second interconnection is fixed to a predetermined logic level.
Claim 6
Dependent Claim
54 words
A semiconductor integrated circuit device as claimed in claim 1 in which only said first random access memory macro carries out a random access memory function, all of the latch circuits of said second random access memory macro having outputs coupled to the certain internal cells of said logic macro by said second interconnection.
Claim 7
Dependent Claim
31 words
A semiconductor integrated circuit device as claimed in claim 5 in which inputs of the operation circuit of said second random access memory macro are fixed to a predetermined logic level.
Claim 8
Dependent Claim
44 words
A semiconductor integrated circuit device as claimed in claim 1 in which each of the latch circuits within said random access memory macros occupy an area smaller than an area occupied by a latch circuit constituted by the internal cells within said logic macro.
Claim 9
Dependent Claim
63 words
A semiconductor integrated circuit device as claimed in claim 1 in which said at least one of the latch circuits having the output thereof coupled to the certain internal cells of said logic macro by said second interconnection constitutes a circuit part of said logic macro having a function independent of a random access memory function of said second random access memory macro.
Claim 10
Dependent Claim
28 words
A semiconductor integrated circuit device as claimed in claim 1 in which said operation circuit includes an X-address decoder driver, a Y-address decoder driver and a sense/write amplifier.
References Cited (Backward Citations)
US4419746A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-08-07 | 1993-02-06 | 1993-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-07 | 1997-02-06 | 1997-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-07 | 2001-02-06 | 2001-08-08 | $7700.00 | Window Closed / Lapsed |