Method and system for ensuring security of code in a system on a chip

The present invention provides for validating downloaded code. Code is transferred to a volatile memory of a system on a chip from a source. The volatile memory is decoupled from the source of the transferred code through employment of an isolation bus. An embedded security value, associated with the downloaded code, is determined. The security value is compared to an unlock sequence stored within the non-volatile memory in the system on a chip. If the security value matches the unlock sequence, the downloaded code is allowed access to secure data stored in the non-volatile memory. If the security value does not match the unlock sequence, the downloaded code is denied access to the secure data stored in the non-volatile memory.