MAC7200 datasheet(213/976 Pages) FREESCALE

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Nexus Protocol

MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

135

11.2

Nexus Protocol

For a complete description of the Nexus protocol, please refer to the IEEE Nexus specification.

11.3

Nexus Implementation

Nexus 3 was chosen over Nexus 2 because of the additional requirement for Data Trace capabilities. The

Nexus module, part of a standard supported by Freescale, has the following advantages.

xxxx 1xxx

Nexus Watchpoint 2

xxx1 xxxx

Nexus Watchpoint 3

xx1x xxxx

Nexus Watchpoint 4

x1xx xxxx

Nexus Watchpoint 5

1xxx xxxx

Nexus Watchpoint 6

Table 11-4. Resource Code Encoding (TCODE = 27)

Resource Code

Description

0000

Program Trace Instruction Counter Overflow

0001

Branch / Predicate Instruction History Buffer

0010–1111

Reserved for future functionality

Table 11-5. Event Code Encoding (TCODE = 33)

Event Code

Description

0000

Entry into Debug Mode

0001

Entry into Low Power Mode (CPU only)

0010–0011

Reserved for future functionality

0100

Program Trace Disable

0101–1111

Reserved for future functionality

Table 11-6. Data Trace Size (DSZ) Encodings (TCODE = 5, 6, 13, 14)

DTM Size

Encoding

Transfer Size

000

8-bit

001

16-bit

010

32-bit

011–111

Reserved

Table 11-3. Watchpoint Source Encoding (TCODE = 15) (Continued)

Watchpoint Code

Description

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