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4. 2. Logical References to memory and I/O devices
Access Characteristics
Depending on configuration, the cpu can work in big or little endian
mode. For independence the operands within io–device code ranges
should be referred to as word (32 bit) operands with the valid bytes indi-
cated by ”b” at ”Byte format” (see below).
”Byte 0” means the byte connected to data lines D0 to D7
Byte, halfword (2 byte), word (4 byte) and block (4 word) accesses are
supported
The cpu reads always 4 bytes at once from the memory range, but it reads
from the vme io–code range and it writes to evry location only the bytes
which the processor wants to be accessed.
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