Datasheet

5-32 MCF5407 User’s Manual
Background Debug Mode (BDM)
5.5.3.3.3 Read Memory Location (READ)
Read data at the longword address. Address space is defined by BAAR[TT,TM]. Hardware
forces low-order address bits to zeros for word and longword accesses to ensure that word
addresses are word-aligned and longword addresses are longword-aligned.
Command/Result Formats:
Command Sequence:
Figure 5-25. READ Command Sequence
Operand Data The only operand is the longword address of the requested location.
Result Data Word results return 16 bits of data; longword results return 32. Bytes
are returned in the LSB of a word result, the upper byte is undefined.
0x0001 (S = 1) is returned if a bus error occurs.
15 12 11 8 7 4 3 0
Byte
Command
0x1 0x9 0x0 0x0
A[31:16]
A[15:0]
Result XXXXXXXX D[7:0]
Word Command 0x1 0x9 0x4 0x0
A[31:16]
A[15:0]
Result D[15:0]
Longword Command 0x1 0x9 0x8 0x0
A[31:16]
A[15:0]
Result D[31:16]
D[15:0]
Figure 5-24. READ Command/Result Formats
MS ADDR
"NOT READY"
LS ADDR
"NOT READY"
READ (B/W)
???
NEXT CMD
"NOT READY"
XXX
"NOT READY"
XXX
XXX
BERR
RESULT
NEXT CMD
READ
MEMORY
LOCATION
MS ADDR
"NOT READY"
LS ADDR
"NOT READY"
READ (LONG)
???
NEXT CMD
"NOT READY"
XXX
"NOT READY"
XXX
XXX
BERR
MS RESULT
XXX
READ
MEMORY
LOCATION
NEXT CMD
LS RESULT