UM0434 datasheet(345/390 Pages) STMICROELECTRONICS

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Nexus3 module

UM0434

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12.4.9

Data trace control register (DTC)

The data trace control register controls whether DTM messages are restricted to reads,

writes, or both for a user programmable address range. There are two data trace channels

controlled by the DTC for the Nexus3 module. Each channel can also be programmed to

trace data accesses or instruction accesses.

Table 236 shows DTC.

Table 237 details the data trace control register fields.

Table 236.

Data trace control register

31 30 29 28 27

5 4 3

2 1 0

Field RWT1 RWT2

—

RC1 RC2 — DI1

—

Reset

All zeros

R/W

Read/Write

Numbe

0xD

Table 237.

DTC field descriptions

Bits

Name

Description

31–30

RWT1

Read/write trace 1

00 No trace enabled

X1 Enable data read trace

1X Enable data write trace

29–28

RWT2

Read/write trace 2

00 No trace enabled

X1 Enable data read trace

1X Enable data write trace

27–8

—

Reserved, should be cleared.

RC1

Range control 1

0 Condition trace on address within range

1 Condition trace on address outside of range

RC2

Range control 2

0 Condition trace on address within range

1 Condition trace on address outside of range

5–4

—

Reserved, should be cleared.

3DI1

Data access/instruction access trace 1

0 Condition trace on data accesses

1 Condition trace on instruction accesses

2–0

—

Reserved, should be cleared.

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