Real-time adaptive SRAM array for high SEU immunity
First Claim
1. A method for adapting sensitivity of a memory device to single event upsets (SEUs) due to ionizing particles, said method comprising:
- providing a first memory device adapted for receiving single event upsets due to ionizing particles;
generating fail rate data at said first memory device;
providing a control device for receiving said fail rate data input from the first memory device;
determining a predetermined SEU fail rate for said second memory device;
dynamically applying voltage biases to a second memory device, said voltage biases optimally mapped according to said predetermined SEU fail rate,wherein an operating point for said second memory device is dynamically achieved that balances SEU immunity and memory device performance.
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Accused Products
Abstract
A system and method for automatically adjusting one or more electrical parameters in a memory device, e.g., SRAM arrays. The system and method implements an SRAM sensing sub-array for accelerated collection of fail rate data for use in determining the operating point for optimum tradeoff between single event upset immunity and performance of a primary SRAM array. The accelerated fail rate data is input to an algorithm implemented for setting the SEU sensitivity of a primary SRAM memory array to a predetermined fail rate in an ionizing particle environment. The predetermined fail rate is maintained on a real-time basis in order to provide immunity to SEU consistent with optimum performance.
55 Citations
20 Claims
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1. A method for adapting sensitivity of a memory device to single event upsets (SEUs) due to ionizing particles, said method comprising:
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providing a first memory device adapted for receiving single event upsets due to ionizing particles; generating fail rate data at said first memory device; providing a control device for receiving said fail rate data input from the first memory device; determining a predetermined SEU fail rate for said second memory device; dynamically applying voltage biases to a second memory device, said voltage biases optimally mapped according to said predetermined SEU fail rate, wherein an operating point for said second memory device is dynamically achieved that balances SEU immunity and memory device performance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for adapting sensitivity of a memory device to single event upsets (SEUs) due to ionizing particles, said system comprising:
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a first memory array adapted to receive single event upsets due to ionizing particles, said first memory array providing fail rate data; a control device for receiving said fail rate data input from the first sensing memory array and determining a predetermined SEU fail rate for said second memory device, said control device further generating signals adapted for use in setting voltages voltage biases for said second memory device according to said predetermined SEU fail rate; and
,means responsive to said signals for dynamically applying voltage biases to said second memory device, wherein an operating point for said second memory device is dynamically achieved that balances SEU immunity and memory device performance. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification