Synchronous dynamic random access memory with four-bit data prefetch
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United States of America Patent
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Sep 5, 2000
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app pub date -
Jul 6, 1998
filing date -
Jun 17, 1997
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Abstract
A memory circuit for operating synchronously with a system clock signal is designed with a memory array (250, 252, 254, 256) having a plurality of memory cells arranged in rows and columns. Each column decode circuit of a plurality of column decode circuits (502) produces a select signal at a respective column select line (108) in response to a first column address signal. A plurality of sense amplifier circuits (202) is arranged in groups. Each sense amplifier circuit is coupled to a respective column of memory cells. Each sense amplifier circuit includes a select transistor for coupling the sense amplifier to a respective data line (203). A control terminal of each select transistor of a group of sense amplifier circuits is connected to the respective column select line. A data sequence circuit (218) is coupled to receive four data bits from four respective data lines (210, 212, 214, 216) in response to a first cycle of the system clock signal. The data sequence circuit produces four ordered data bits in response to a control signal and a second column address signal. A register circuit (220) is coupled to receive the four ordered data bits. The register circuit produces a sequence of the four ordered data bits in response to a plurality of cycles of the system clock signal after the first cycle of the system clock signal.
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- 15 United States
- 10 France
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Patent Owner(s)
- TEXAS INSTRUMENTS INCORPORATED
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Kawamura, J Patrick | Richardson, TX | 12 | 155 |
Koelling, Jeffrey E | Dallas, TX | 33 | 283 |
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Fee | Large entity fee | small entity fee | micro entity fee |
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Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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