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Security Bit in the Ultra 37000 | Cypress Semiconductor

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Security Bit in the Ultra 37000

Last Updated: January 01, 2012

1. What does the security bit do?
2. How do I set the security bit?
3. Can I recover a design from a device programmed with the security bit?


The security bit is a programmable field in the Ultra 37000 family of devices that prevents certain operations from occuring to the device once programmed. When such a bit is set, there is no way to recover the design from a programmed device and all operations on the device are prohibited, save erasing the device and reprogramming.

Within the device itself, a '0' within the fuse map of the device indicates a "secure" device. However, the JEDEC standard states that a '1' indicates security. As a result, the ISR software flips this bit when programming the device. As a default, the designs generated from Warp are unsecure.

Please be noted our entire Cypress CPLD product are Obsolete and not recommended for new design and development. For more information on CPLD product, please visit our webpage:

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