Datasheet

Chapter 5. Debug Support 5-35
Background Debug Mode (BDM)
5.5.3.3.5 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
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.
NOTE:
DUMP does not check for a valid address; it is a valid command
only when preceded by
NOP, READ, or another DUMP command.
Otherwise, an illegal command response is returned.
NOP can
be used for intercommand padding without corrupting the
address pointer.
The size field is examined each time a
DUMP command is processed, allowing the operand
size to be dynamically altered.
Command/Result Formats:
15 12 11 8 7 4 3 0
Byte Command 0x1 0xD 0x0 0x0
Result XXXXXXXX D[7:0]
Word Command 0x1 0xD 0x4 0x0
Result D[15:0]
Longword Command 0x1 0xD 0x8 0x0
Result D[31:16]
D[15:0]
Figure 5-28. DUMP Command/Result Formats