Motorola MCF5281 用户手册
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Chapter 29. Debug Support
29-27
Background Debug Mode (BDM)
Command Sequence:
Figure 29-24.
WRITE
Command Sequence
Operand Data
This two-operand instruction requires a longword absolute address
that specifies a location to which the data operand is to be written.
Byte data is sent as a 16-bit word, justified in the LSB; 16- and 32-bit
operands are sent as 16 and 32 bits, respectively
that specifies a location to which the data operand is to be written.
Byte data is sent as a 16-bit word, justified in the LSB; 16- and 32-bit
operands are sent as 16 and 32 bits, respectively
Result Data
Command complete status is indicated by returning 0xFFFF (with S
cleared) when the register write is complete. A value of 0x0001 (with
S set) is returned if a bus error occurs.
cleared) when the register write is complete. A value of 0x0001 (with
S set) is returned if a bus error occurs.
29.5.3.3.5 Dump Memory Block (
DUMP
)
DUMP
is used with the
READ
command to access large blocks of memory. An initial
READ
is executed to set up the starting address of the block and to retrieve the first result. If an
initial
initial
READ
is not executed before the first
DUMP
, an illegal command response is returned.
The
DUMP
command retrieves subsequent operands. The initial address is incremented by
the operand size (1, 2, or 4) and saved in a temporary register. Subsequent
DUMP
commands
use this address, perform the memory read, increment it by the current operand size, and
store the updated address in the temporary register.
store the updated address in the temporary register.
XXX
’NOT READY’
WRITE (LONG)
???
MS ADDR
’NOT READY’
LS ADDR
’NOT READY’
WRITE
MEMORY
LOCATION
NEXT CMD
’CMD COMPLETE’
MS DATA
’NOT READY’
NEXT CMD
’NOT READY’
XXX
BERR
XXX
’NOT READY’
WRITE (B/W)
???
MS ADDR
’NOT READY’
LS ADDR
’NOT READY’
WRITE
MEMORY
LOCATION
NEXT CMD
’CMD COMPLETE’
DATA
’NOT READY’
NEXT CMD
’NOT READY’
XXX
BERR
LS DATA
’NOT READY’