Static information storage and retrieval – Read/write circuit – Precharge
Patent
1999-11-30
2000-08-15
Nelms, David
Static information storage and retrieval
Read/write circuit
Precharge
365202, 365196, 365190, G11C 700
Patent
active
061046531
ABSTRACT:
An exemplary 18 MBit memory array includes four banks of array blocks. At the end of an active cycle, the exemplary memory array is automatically taken back into precharge without waiting for a control signal. One edge of a clock causes the memory array to execute a useful cycle, then to automatically reset itself in preparation for a new cycle, preferably using two sets of precharge signals- one is an automatically timed pulse, while the other stays on until the start of the next cycle. Both turn on automatically at the same time just after the selected word line is brought low. One equilibrate signal is turned off by a timed pulse just when the bit line equilibration is substantially complete (i.e., at the end of the active cycle), while the other equilibrate signal is turned off by the start of the subsequent cycle. The pulsed equilibrate signal drives much larger internal capacitive loads, such as large equilibration devices, while the non-pulsed (i.e., "level") equilibrate signal drives fewer and/or much smaller devices which somewhat assist the larger pulsed equilibrate devices in equilibrating the various nodes, but which fewer and/or much smaller devices alone maintain the equilibration until the next active cycle. The total capacitance of the various equilibration signal lines which must be discharged as an immediate result of the start of a new cycle is greatly reduced and the buffering to drive this reduced capacitance can be accomplished with fewer progressively larger buffering stages. Therefore, the equilibration is turned off with less delay after the initiating control signal, reducing the access time of the memory array.
REFERENCES:
patent: 5654933 (1997-08-01), McLaury
patent: 5835440 (1998-11-01), Manning
patent: 5903502 (1999-05-01), Porter
Integrated Device Technology Inc.
Le Thong
Nelms David
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