Programming Model
http://www.motorola.com/computer/literature 3-51
3
rom b siz The rom b siz control bits are the size of ROM/Flash for Block
B. They are encoded as shown in the following table.
rom_b_rv and rom_a_rv determine which if either of Blocks A and B is
the source of reset vectors or any other access in the range $FFF00000 -
$FFFFFFFF as shown in Table 3-16.
rom_b_rv is initialized at power-up reset to match the inverse of the value
on the CKD1 pin.
rom b en When rom b en is set, accesses to Block B ROM/Flash in the
address range selected by ROM B BASE are enabled. When rom b en is
cleared they are disabled.
rom b we When rom b we is set, writes to Block B ROM/Flash are
enabled. When rom b we is cleared they are disabled. Refer back to Table
3-17 for more details.
Table 3-18. ROM/Flash Block B Size Encoding
rom b siz BLOCK SIZE
%000 1Mbytes
%001 2Mbytes
%010 4Mbytes
%011 8Mbytes
%100 16Mbytes
%101 32Mbytes
%110 64Mbytes
%111 Reserved
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