Motorola MCF5282 ユーザーズマニュアル
MOTOROLA
Chapter 29. Debug Support
29-29
Background Debug Mode (BDM)
Command Sequence:
Figure 29-26.
DUMP
Command Sequence
Operand Data:
None
Result Data:
Requested data is returned as either a word or longword. Byte data is
returned in the least-significant byte of a word result. Word results
return 16 bits of significant data; longword results return 32 bits. A
value of 0x0001 (with S set) is returned if a bus error occurs.
returned in the least-significant byte of a word result. Word results
return 16 bits of significant data; longword results return 32 bits. A
value of 0x0001 (with S set) is returned if a bus error occurs.
29.5.3.3.6 Fill Memory Block (
FILL
)
A
FILL
command is used with the
WRITE
command to access large blocks of memory. An
initial
WRITE
is executed to set up the starting address of the block and to supply the first
operand. The
FILL
command writes subsequent operands. The initial address is incremented
by the operand size (1, 2, or 4) and saved in a temporary register after the memory write.
Subsequent
Subsequent
FILL
commands use this address, perform the write, increment it by the current
operand size, and store the updated address in the temporary register.
If an initial
WRITE
is not executed preceding the first
FILL
command, the illegal command
response is returned.
NOTE:
The
FILL
command does not check for a valid address—
FILL
is
a valid command only when preceded by another
FILL
, a
NOP
,
or a
WRITE
command. Otherwise, an illegal command response
is returned. The
NOP
command can be used for intercommand
padding without corrupting the address pointer.
XXX
’NOT READY’
DUMP (B/W)
???
XXX
’ILLEGAL’
NEXT CMD
’NOT READY’
NEXT CMD
’NOT READY’
READ
MEMORY
LOCATION
XXX
BERR
NEXT CMD
RESULT
XXX
’NOT READY’
DUMP (LONG)
???
XXX
’ILLEGAL’
NEXT CMD
’NOT READY’
NEXT CMD
’NOT READY’
READ
MEMORY
LOCATION
XXX
BERR
NEXT CMD
MS RESULT
NEXT CMD
LS RESULT