PXN20RM Datasheet, PDF (1224/1376 Pages) Freescale Semiconductor, Inc – PXN20 Microcontroller

Nexus Development Interface (NDI)
Table 36-44. Public TCODEs Supported by Nexus2+ (continued)
Message Name
Packet Size
(bits)
Min Max
Packet Packet
Name Type
Packet Description
Program Trace —
6
Program Correlation
Message
4
4
6
TCODE Fixed TCODE number = 33 (0x21)
4
SRC
Fixed source processor identifier
4
EVCODE Fixed event correlated w/ program flow (Refer to Table 36-47)
1
8
I-CNT Variable # sequential instructions executed since last taken branch
1
32
HIST Variable branch / predicate instruction history (see Section 36.7.9.3.1,
Branch Trace Messaging (BTM))
1 _{The user can select between the two types of program trace. The advantages for each are discussed in Section 36.7.9.3.1,}
Branch Trace Messaging (BTM). If the branch history method is selected, the shaded TCODEs above are not messaged out.
Table 36-45 shows the error code encodings used when reporting an error via the Nexus2+ Error Message.
Table 36-45. Error Code Encoding (TCODE = 8)
Error Code
(ECODE)
Description
00000
Ownership trace overrun
00001
Program trace overrun
00010
Reserved
00011
Read/write access error
00101
Invalid access opcode (Nexus register unimplemented)
00110
Watchpoint overrun
00111
Program trace and ownership trace overrun
01000
(Program trace or ownership trace) and watchpoint overrun
01001–0111 Reserved
11000
BTM lost due to collision w/ higher priority message
11001–11111 Reserved
Table 36-46 shows the encodings used for resource codes for certain messages.
Table 36-46. RCODE values (TCODE = 27)
Resource Code
(RCODE)
Description
Resource Data
(RDATA)
0000
0001
Program Trace Instruction Counter overflow (reached 255 and was reset) 0xFF
Program Trace, Branch / Predicate Instruction History. This type of packet Branch History. This type of
is terminated by a stop bit set to 1 after the last history bit.
packet is terminated by a stop bit
set to a 1 after the last history bit.
36-74
PXN20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor