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DS5002FP Datasheet(PDF) 10 Page - Dallas Semiconductor |
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DS5002FP Datasheet(HTML) 10 Page - Dallas Semiconductor |
10 / 29 page DS5002FP 10 of 29 this action. In addition, power is momentarily removed from the byte-wide bus interface including the VCCO pin, resulting in the loss of data in external RAM. TOP LAYER COATING The DS5002FPM is provided with a special top-layer coating that is designed to prevent a probe attack. This coating is implemented with second-layer metal added through special processing of the microcontroller die. This additional layer is not a simple sheet of metal, but rather a complex layout that is interwoven with power and ground, which are in turn connected to logic for the Encryption Key and the Security Lock. As a result, any attempt to remove the layer or probe through it will result in the erasure of the Security Lock and/or the loss of Encryption Key bits. BOOTSTRAP LOADING Initial loading of application software into the DS5002FP is performed by firmware within the on-chip Bootstrap Loader communicating with a PC via the on-chip serial port in a manner which is almost identical to that for the DS5001FP. The user should consult the DS5001FP data sheet as a basis of operational characteristics of this firmware. Certain differences in loading procedure exist in order to support the security feature. These differences are documented below. Table 1 summarizes the commands accepted by the bootstrap loader. When the Bootstrap Loader is invoked, portions of the 128-byte scratchpad RAM area are automatically overwritten with zeroes, and then used for variable storage for the bootstrap firmware. Also, a set of 8 bytes are generated using the random number generator circuitry and are saved as a potential word for the 64-bit Encryption Key. Any read or write operation to the DS5002FP’s external program/data SRAM can only take place if the Security Lock bit is in a cleared state. Therefore, the first step which is taken in the loading of a program should be the clearing of the Security Lock bit through the “U” command. |
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