MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
25-84
Freescale Semiconductor
25.14.5.1 Data Trace
This section deals with the data trace mechanism supported by the NXDM module. Data trace is
implemented via data write messaging (DWM) and data read messaging (DRM).
25.14.5.2 Data Trace Messaging (DTM)
NXDM data trace messaging is accomplished by snooping the NXDM data bus, and storing the
information for qualifying accesses (based on enabled features and matching target addresses). The
NXDM module traces all data access that meet the selected range and attributes.
NOTE
Data trace is ONLY performed on DMA accesses to the system bus.
25.14.5.3 DTM Message Formats
The NXDM block supports five types of DTM Messages — data write, data read, data write
synchronization, data read synchronization and error messages.
Table 25-56. Error Code (ECODE) Encoding (TCODE = 8)
Error Code
(ECODE)
Description
00000
Reserved
00001
Reserved
00010
Data Trace overrun
00011
Reserved
00100
Reserved
00101
Invalid access opcode (Nexus Register unimplemented)
00110
Watchpoint overrun
00111
Reserved
01000
Data Trace and Watchpoint overrun
01001–11111
Reserved
Table 25-57. Data Trace Size (DSZ) Encodings (TCODE = 5,6,13,14)
DTM Size Encoding
Transfer Size
000
Byte
001
Halfword (2 bytes)
010
Word (4 bytes)
011
Doubleword (8 bytes)
100–111
Reserved
Summary of Contents for MPC5553
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