Appeal No. 2002-1319 Page 10
Application No. 08/974,971
In particular, the memory address bus FA[0:17]
is compared in a boot block protect decoder 2050
(FIGS. 25 and 26), part of the control logic 720,
with a predetermined address range forming the
protected boot block. The boot block size bit
HUICFG_1[0:3] and flash size bit HUICFG_1[7] may
be specified in a configuration register HUICFG_1[0:17]
to define the non-volatile sector. In order to block
writes to the protected sector, the output of the
comparator 2052 is ORED by way of an OR gate 2054
with a write enable signal WE to create a
non-volatile sector.
From this disclosure of DeRoo, we find that HUI 700
provides a non-volatile sector protection for an EEPROM to be
used as the common memory device (See figure 20), and that since
HUI 700 is hardware strapped, it does not allow software
reconfiguration of memory protection. Thus, the software is
disabled from writing to define non-volatile sectors. Memory
address bus FA[0:17] is compared in a boot block protection
decoder 2050 (figures 25 and 26) with a predetermined address
range forming the protected boot block. We further find that the
boot block size bit HUICFG_[0:3] may be specified in a
configuration register HUICFG_1[0:17] to define the non-volatile
sector (see figure 25).
DeRoo further discloses (col. 87, lines 46-49) that various
sector sizes are possible as illustrated in Table LXVIII, and
that several of the bits in the HUICFG_1[0:3,7] may be configured
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