mc68ec060 Freescale Semiconductor, Inc, mc68ec060 Datasheet - Page 255

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

RW—Read and Write
SIZE—Transfer Size
TT—Transfer Type
TM—Transfer Modifier
PBE—Push Buffer Bus Error
SBE—Store Buffer Bus Error
PTA—Pointer A Fault
PTB—Pointer B Fault
IL—Indirect Level Fault
MOTOROLA
A read-modify-write indicates that the referenced address is capable of being read and
written. For example, for an ADD D0,<ea> instruction, the memory operand is read, mod-
ified, and then written by this instruction. A read-modify-write does not imply a “locked”
sequence.
The SIZE field corresponds to the original access size. If a data cache line read results
from a read miss and the line read encounters a bus error, the SIZE field in the resulting
stack frame indicates the size of the original read generated by the execution unit.
00 = Undefined, reserved
01 = Write
10 = Read
11 = Read-Modify-Write
00 = Byte
01 = Word
10 = Long
11 = Double Precision or MOVE16
This field defines the TT1–TT0 signal encoding for the faulted access.
This field defines the TM2–TM0 signal encoding for the faulted access.
0 = Fault not caused by a bus error (TEA asserted) during a push buffer write.
1 = Fault caused by a bus error (TEA asserted) during a push buffer write.
0 =Fault not caused by a bus error (TEA asserted) during a store buffer write.
1 =Fault caused by a bus error (TEA asserted) during a store buffer write.
0 =Fault not due to an invalid root level descriptor.
1 =Fault due to an invalid root level descriptor.
0 =Fault not due to an invalid pointer level descriptor.
1 =Fault due to an invalid pointer level descriptor.
0 =Fault not due to encountering a second indirect page descriptor.
1 =Fault due to encountering a second indirect page descriptor.
M68060 USER’S MANUAL
Exception Processing
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