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Chapter 5. Debug Support
5-29
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 rst result. If an
initial READ is not executed before the rst 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 eld is examined each time a DUMP command is processed, allowing the operand
size to be dynamically altered.
Command/Result Formats:
15
14
13
12
11
10
9876543210
Byte
Command
0x1
0xD
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 5-26. DUMP Command/Result Formats
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