Table 3-13. Read/Write To Rom/Flash - Motorola MVME5100 Programmer's Reference Manual

rom a en
rom a we When rom a we is set, writes to Block A ROM/Flash are
Transfer
Cycle
Size
write 1-byte
write 1-byte
write 1-byte
write 4-byte
write 4-byte
write 4-byte
write 4-byte
write 2,3,5,6,7,
8,32-byte
read X
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rom_a_rv is initialized at power-up reset to match the
value on the RD0 pin.
When rom a en is set, accesses to Block A ROM/Flash in
the address range selected by ROM A BASE are enabled.
When rom a en is cleared, they are disabled.
enabled. When rom a we is cleared, they are disabled.
Note that if rom_a_64 is cleared, only 1-byte writes are
allowed. If rom_a_64 is set, only 4-byte writes are
allowed. The SMC ignores other writes. If a valid write is
attempted and rom a we is cleared, the write does not
happen but the cycle is terminated normally.
See Table 3-13

Table 3-13. Read/Write to ROM/Flash

Alignment rom_x_64
X 0
X 0
X 1
Misaligned X
Aligned 0
Aligned 1
Aligned 1
X X
X X
for details of ROM/Flash accesses.
rom_x_we Hawk Response
0 Normal termination, but no
write to ROM/Flash
1 Normal termination, write
occurs to ROM/Flash
X No Response
X No Response
X No Response
0 Normal termination, but no
write to ROM/Flash
1 Normal termination, write
occurs to ROM/Flash
X No Response
X Normal Termination
Programming Model
3-55
3