Security for digital signal processor program memory

Details Security for digital signal processor program memory Security for digital signal processor program memory

1988-05-02

1991-05-07

Fleming, Michael R.

Boots, shoes, and leggings

3642466, G06F 1214

Patent

active

050141910

ABSTRACT:
The processor executes programs from an internal EEPROM or from an external source. The EEPROM can be read either by a special operating (test) mode of the processor or by an instruction executing under normal operating mode from the EEPROM or from an external source. Similarly, the EEPROM can be programmed (written) either by a special operating mode or by under a normal operating mode instruction. The read and write circuits for the EEPROM are controlled to provide two levels of security against piracy of programmed information. In the first level, access is prevented for the read and write test modes and also for the read and write normal operating instructions if the instructions originate from an external source. In the second level, program execution from external source is also disabled.

REFERENCES:
patent: 4183085 (1980-01-01), Roberts et al.
patent: 4184201 (1980-01-01), Melberg et al.
patent: 4513174 (1985-04-01), Herman
patent: 4519032 (1985-05-01), Mendell
patent: 4521853 (1985-06-01), Guttag
patent: 4583196 (1986-04-01), Koo
patent: 4584665 (1986-04-01), Vrielink
patent: 4698750 (1987-10-01), Wilkie et al.

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