UM0434 datasheet(335/390 Pages) STMICROELECTRONICS

335 / 390 page

Nexus3 module

UM0434

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Table 213 shows the encodings used for resource codes for certain messages.

Table 214 shows the event code encodings used for certain messages.

Table 215 shows the data trace size encodings used for certain messages.

Note:

Program trace can be implemented using either branch history/predicate instruction

messages, or traditional direct/indirect branch messages, and the user can select between

the two types of program trace. The advantages of each are discussed in Chapter 12.7.1:

Branch trace messaging (BTM) on page 350.” If the branch history method is selected, the

shaded TCODES above will not be messaged out.

12.4

Nexus3 Programmer’s model

This section describes the Nexus3 programmers model. Nexus3 registers are accessed

using the JTAG/OnCE port in compliance with IEEE 1149.1. See

Chapter 12.5: Nexus3

Nexus3 registers and output signals are numbered using bit 0 as the least significant bit.

This bit ordering is consistent with the ordering defined by the IEEE-ISTO 5001 standard.

Table 213.

Resource code encodings (TCODE = 27)

Resource code

(RCODE)

Description

0000

Program trace instruction counter reached 255 and was reset.

0001

Program trace, branch/predicate instruction history. This type of packet is

terminated by a stop bit set after the last history bit.

Table 214.

Event code encodings (TCODE = 33)

Event code

(EVCODE)

Description

0000

Entry into debug mode

0001

Entry into low power mode (CPU only)

0010–1111

Reserved

1110

Entry into a VLE page from a non-VLE page

1111

Entry into a non-VLE page from a VLE page

Table 215.

Data trace size encodings (TCODE = 5, 6, 13, or 14)

DTM size encoding

Transfer size

000

Byte

001

Half-word (2 bytes)

010

Word (4 bytes)

011

Double-word (8 bytes)

100

String (3 bytes)

101–111

Reserved

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