Semiconductor memory

• US 4,608,666 A
• Filed: 04/20/1984
• Issued: 08/26/1986
• Est. Priority Date: 06/24/1983
• Status: Expired due to Term

• Current Assignee: Tokyo Shibaura Denki Kabushiki Kaisha 72 Horikawa-Cho Saiwai-Ku Kawasaki-Shi Japan
• Original Assignee: Tokyo Shibaura Denki Kabushiki Kaisha
• Inventors: Uchida, Yukimasa
• Primary Examiner(s): Fears, Terrell W.
• Application Number:
  US06/602,449
• Time in Patent Office: 858 Days
• Field of Search: 365/182, 365/183, 365/184, 365/189, 365/222
• US Class Current: 365/222
• CPC Class Codes: G11C 11/005 comprising combined but independently operative RAM-ROM, RAM-PROM, RAM-EPROM cells
• CPC Class Codes: G11C 11/409 Read-write [R-W] circuits
• CPC Class Codes: G11C 11/419 Read-write [R-W] circuits
• CPC Class Codes: G11C 7/1051 Data output circuits, e.g. read-out amplifiers, data output buffers, data output registers, data output level conversion circuits
• CPC Class Codes: G11C 7/106 Data output latches
• CPC Class Codes: G11C 7/1078 Data input circuits, e.g. write amplifiers, data input buffers, data input registers, data input level conversion circuits
• CPC Class Codes: G11C 7/1087 Data input latches

Abstract

A large capacity and high speed semiconductor memory is disclosed. Static memory cell rows are provided so as to correspond to dynamic memory cell rows in a dynamic memory cell array. Information is transferred with transfer means between static memory cells in the static memory cell rows and dynamic memory cells corresponding thereto. Access for a read/write operation externally required is effected to static memory cell rows.

Claims

1. In a semiconductor memory comprising a dynamic memory cell array having a plurality of rows of volatile dynamic memory cells for storing information, said volatile dynamic memory cells being arranged in the row and column directions in a matrix manner, word lines commonly connected in the row direction to said volatile dynamic memory cells in said dynamic memory cell array, bit lines commonly connected in the column direction to said volatile dynamic memory cells in said dynamic memory cell array, and a sense amplifier row having sense amplifiers for sense-amplifying a potential difference between paired bit lines,

the improvement comprising:

(a) a static memory cell row having volatile static memory cells corresponding to said dynamic memory cells located in the row direction in said dynamic memory cell array; and

C

(b) transfer gate means for transferring information between said volatile static memory cells in said static memory cell row and the corresponding volatile dynamic memory cells of a desired row of said dynamic memory cell rows such that information of said desired row of said dynamic memory cell rows in said dynamic memory cell array is transferred to said static memory cell row.

2. In a semiconductor memory comprising a dynamic memory cell array wherein dynamic memory cells for storing information therein are arranged in row and column directions in a matrix manner, word lines commonly connected in the row direction to said dynamic memory cells in said dynamic memory cell array, bit lines commonly connected in the column direction to said dynamic memory cells in said dynamic memory cell array, and a sense amplifier row having sense amplifiers for sense-amplifying a potential difference between paired bit lines,

the improvement comprising:

a static memory cell row having static memory cells corresponding to said dynamic memory cells located in the row direction in said dynamic memory cell array;

transfer gate means for transferring information between said static memory cells in said static memory cell row and the corresponding dynamic memory cells;

row selection means for selecting a word line of a dynamic memory cell row of a desired row address in said dynamic memory cell array; and

column selection means for selecting a static memory cell of a desired column address in said static memory cell row,

thereby transferring the information of said dynamic memory cell row commonly connected to said word line selected by said row selection means to said static memory cell row with said transfer gate means, effecting a read/write operation with respect to the static memory cell of said desired column address through a data line connected by said column selection means, transferring the information of said static memory cell row, to which said read/write operation has been effected, to said dynamic memory cell row commonly connected to the word line selected by said row selection means with said transfer gate means, and rewriting the information to said dynamic memory cell row.

3. A semiconductor memory according to claim 2, wherein said row selection means comprises a refresh counter producing internal row address signals for a self-refresh which is counted up every a predetermined time period, thereby self-refreshing the information of the dynamic memory cell row corresponding to row address designated by internal row address signals produced from said refresh counter with said sense amplifier row.

4. A semiconductor memory according to claim 3, wherein a read/write operation to said static memory cells during the refresh operation of said dynamic memory cells is enabled by interrupting said static memory cells and said dynamic memory cells with said transfer gate means.