UM0434 datasheet(359/390 Pages) STMICROELECTRONICS

359 / 390 page

Nexus3 module

UM0434

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Figure 76.

Program trace—direct branch (traditional) and error messages

Figure 77.

Program Trace—Indirect branch with synchronization message

12.8

Data trace

This section deals with the data trace mechanism supported by the Nexus3 module. Data

trace is implemented by means of data write messaging (DWM) and data read messaging

(DRM) in accordance with the

IEEE-ISTO 5001-2003 standard.

12.8.1

Data trace messaging (DTM)

Data trace messaging for the e200z3 is accomplished by snooping the e200z3 virtual data

bus between the CPU and MMU, and storing the information for qualifying access, based on

enabled features and matching target addresses. The Nexus3 module traces all data

accesses that meet the selected range and attributes.

Note:

Data trace is only performed on the e200z3 virtual data bus. This allows for data visibility for

e200z3 processors that incorporate a data cache. Only e200z3 CPU-initiated accesses are

traced. No DMA accesses to the AHB system bus are traced.

Data trace messaging can be enabled in one of two ways:

●

Setting DC1[TM] to enable data trace.

●

Using WT[DTS] to enable data trace on watchpoint hits. e200z3 watchpoints are

configured within the Nexus1 module.

Direct Branch

Error

DBM:

TCODE = 3

Source processor = 0000

Number of sequential instructions = 3

Error:

TCODE = 8

Source processor = 0000

Error code = 1 (Queue overrun—BTM only)

MCKO

MSEO_B

MDO[1:0]

00 11 00 00 00 11 10 11 00 11 10 10 11

TCODE = 12

Source processor = 0000

Number of sequential instructions = 3

Full target address = 0xDEADFACE

11 01 11 10 10 10 11 01

11 00

MCKO

MSEO_B

MDO[1:0]

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