MAC7200 datasheet(259/976 Pages) FREESCALE

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Functional Description

MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

181

Figure 11-45. Error Message (Data Trace only encoded)

11.11.4 Watchpoint Units

The A7S Nexus3 module includes watchpoint units for watchpoint messaging and processor breakpoints.

Watchpoint messages can be generated by either using the Nexus internal watchpoints or by ARM7

watchpoints. The A7S Nexus3 module supports using the internal and external watchpoint sources for

triggering the start and stop of program and data trace messaging (see Section 11.10.3.8, “Watchpoint

Trigger (WT)”). The occurrence of any watchpoint can be programmed to assert the event out (EVTO) pin.

11.11.4.1 Watchpoint Generation

11.11.4.1.1

Internal Watchpoint Units 1 and 2

Watchpoint units 1 and 2 can be configured to assert based on an address compare, a data compare, or both

address and data compare. Address comparisons may be masked on a bitwise basis with the BWAM

registers. A zero bit programmed in the BWAM registers will result in the corresponding address bit being

ignored during the associated address comparisons.

Data value comparisons can be masked on a byte basis with the BWDM registers. The data value compare

registers (BWD1 and BWD2) are 32 bit registers. A zero bit programmed in the BWDM registers will

result in the corresponding byte being ignored during the associated data value comparison. Only active

byte lanes are compared. Inactive byte lanes are considered mismatching bytes unless they are masked by

the BWDM registers.

The following compare modes are supported:

1. When the BWO field within a BWC register is initialized to an address only compare, a core access

address that matches the associated BWA register will cause an internal watchpoint signal to be

generated.

2. When the BWO field within a BWC register is initialized to a data only compare, a core access data

value that matches on the associated BWD registers will cause an internal watchpoint to be

generated.

3. When the BWO field within a BWC register is initialized to both address and data compare, a core

access that matches both the associated BWA and BWD registers will cause an internal watchpoint

to be generated.

Table 11-42 provides some example configurations for internal watchpoints.

00001000

TCODE = 8

source processor = 0000

error code = 2 (queue overrun, DTM only)

xxxxxxxx

MCKO

MSEO_B[1:0]

MDO[7:0]

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