Freescale Semiconductor MCF5480 - Manual (Page 292)

MCF548x Reference Manual, Rev. 3
8-42 Freescale Semiconductor
Command Sequence:
Figure 8-34. FILL Command Sequence
Operand Data: A single operand is data to be written to the memory location. Byte data is sent as
a 16-bit word, justified in the least-significant byte; 16- and 32-bit operands are
sent as 16 and 32 bits, respectively.
Result Data: Command complete status (0xFFFF) is returned when the register write is
complete. A value of 0x0001 (with S set) is returned if a bus error occurs.
8.5.3.3.7 Resume Execution ( GO )
The pipeline is flushed and refilled before normal instruction execution resumes. Prefetching begins at the
current address in the PC and at the current privilege level. If any register (such as the PC or SR) is altered
by a BDM command while the processor is halted, the updated value is used when prefetching resumes.
If a
GO
command is issued and the CPU is not halted, the command is ignored.
Command Sequence:
Figure 8-36. GO Command Sequence
Operand Data: None
15 12 11 8 7 4 3 0
0x0 0xC 0x0 0x0
Figure 8-35. GO Command Format
XXX
’NOT READY’
FILL (B/W)
???
DATA
’NOT READY’
NEXT CMD
’NOT READY’
WRITE
MEMORY
LOCATION
XXX
BERR
NEXT CMD
’CMD COMPLETE’ XXX
’ILLEGAL’
NEXT CMD
’NOT READY’
XXX
’NOT READY’
FILL (LONG)
???
MS DATA
’NOT READY’
LS DATA
’NOT READY’
WRITE
MEMORY
LOCATION
XXX
BERR
NEXT CMD
’CMD COMPLETE’ XXX
’ILLEGAL’
NEXT CMD
’NOT READY’
NEXT CMD
’NOT READY’
GO
???
NEXT CMD
’CMD COMPLETE’