MC68030RC33

Manufacturer Part NumberMC68030RC33
DescriptionMC68030RC33ENHANCED 32-BIT MICROPROCESSOR
ManufacturerMotorola
MC68030RC33 datasheet
 


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Page 43/602:

ORGANIZATION OF DATA IN MEMORY

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Data Organization and Addressing Capabilities
The supervisor programming model (see Figure 1–3) shows the control registers. The cache
control register (CACR) provides control and status information for the on-chip instruction
and data caches. The cache address register (CAAR) contains the address for cache control
functions. The vector base register (VBR) provides the base address of the exception vector
table. All operations involving the CACR, CAAR, and VBR are long-word operations,
whether these registers are used as the source or the destination operand.
The alternate function code registers (SFC and DFC)
are 32-bit registers with only bits 2:0 implemented that contain the address space values
(FC0-FC2) for the read or write operands of MOVES, PLOAD, PFLUSH, and PTEST
instructions. The MOVEC instruction is used to transfer values to and from the alternate
function code registers. These are long-word transfers; the upper 29 bits are read as zeros
and are ignored when written.
The remaining control registers in the supervisor programming model are used by the
memory management unit (MMU). The CPU root pointer (CRP) and supervisor root pointer
(SRP) contain pointers to the user and supervisor address translation trees. Transfers of
data to and from these 64-bit registers are quad-word transfers. The translation control
register (TC) contains control information for the MMU. The MC68030 always uses long-
word transfers to access this 32-bit register. The transparent translation registers (TT0 and
TT1) also contain 32 bits each; they identify memory areas for direct addressing without
address translation. Data transfers to and from these registers are long-word transfers. The
MMU status register (MMUSR) stores the status of the MMU after execution of a PTEST
instruction. It is a 16-bit register, and transfers to and from the MMUSR are word transfers.
Refer to Section 9 Memory Management Unit for more detail.
2.3 ORGANIZATION OF DATA IN MEMORY
Memory is organized on a byte-addressable basis where lower addresses correspond to
higher order bytes. The address, N, of a long-word data item corresponds to the address of
the most significant byte of the highest order word. The lower order word is located at
address N + 2, leaving the least significant byte at address N + 3 (refer to Figure 2–1). Notice
that the MC68030 does not require data to be aligned on word boundaries (refer to Figure
2–2), but the most efficient data transfers occur when data is aligned on the same byte
boundary as its operand size. However, instruction words must be aligned on word
boundaries.
MOTOROLA
MC68030 USER’S MANUAL
2-5