Appeal No. 2002-1319 Page 9
Application No. 08/974,971
CPU is in the protected area of the memory. This has the effect
of preventing modification of the protected area by a sector
modification algorithm.” (Col. 3, lines 31-40.) From these
disclosures of DeRoo, we find that the size of the protected area
can be changed on the manufacturing line as needed, but that once
configured to protect a specific size and location in the non-
volatile memory, modification of the protected area by a sector
modification algorithm is prevented.
DeRoo further discloses (col. 76, Table LXVIII) under the
title of "HUI1 HARDWARE CONFIGURATION STRAPS REGISTER 1" a
listing of various boot block sizes ranging from 2K to 32K.
DeRoo further discloses (col. 87, lines 18-44) that:
The HUI 700 provides non-volatile sector protection
allowing a standard electrically erasable programmable
read-only memory (EEPROM) to be used as the common
memory device 704 and utilized as a functional
equivalent to a protected “boot block” memory device.
In effect, the HUI 700 acts as front-end to the common
memory device 704. As such, it captures protected
address ranges to block data writes. And, since the
HUI 700 is hardware strapped, it does not allow
software reconfiguration of memory protection.
Thus, as described below, where the programmable
memory provides for global erasure, the HUI 700
front-end hardware traps the command, rendering
it inoperable. Moreover, the software is completely
disabled from writing to define non-volatile sectors.
1 Human User Interface.
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