mc68ec060 Freescale Semiconductor, Inc, mc68ec060 Datasheet - Page 299

• Manufacturer Part Number: mc68ec060
• Description: Mc68060 Superscalar 68k Microprocessor Including The Lc060 And Ec060
• Manufacturer: Freescale Semiconductor, Inc

OEP. In many cases, a non-standard instruction requires multiple cycles to execute and the
operation is decomposed into a series of “standard” cycles.
The MC68060 definition of a standard instruction is:
The standard instruction group is subdivided into two classes:
The non-standard instruction group is subdivided into three classes:
Given these instruction classifications, consider Table 10-1 which defines Test 2 of the
superscalar dispatch algorithm of the OEP:
MOTOROLA
• The instruction requires a maximum of one set of extension words.
• The instruction makes a maximum of one memory access.
• The resources required by the instruction are completely specified by the operation
pOEP | sOEP
pOEP-only
pOEP-until-last
pOEP-only
pOEP-but-
allows-sOEP
word.
This class identifies those standard instructions which may be executed
This class of standard instructions may be executed in the primary OEP
Many of the non-standard instructions represent a combination of
instruction to be dispatched from the sOEP during the last cycle of its
This class of non-standard instructions may only be executed in the
This class of non-standard instructions requires that the
memory-to-memory MOVE instruction. This instruction is decomposed
into two standard operations: first, a standard read cycle followed by a
in either the primary or secondary OEP. This group represents all
standard single-cycle instructions.
only. This class includes all multi-cycle standard instructions.
multiple “standard” operations. As an example, consider the
standard write cycle. This class allows a standard single-cycle
pOEP execution.
primary OEP.
operation be performed in the primary OEP, but allows standard
instructions of the pOEP | sOEP class to be dispatched to the
secondary OEP.
M68060 USER’S MANUAL
Instruction Execution Timing
10-3