MAC7200 datasheet(261/976 Pages) FREESCALE

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Functional Description

MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

183

11.11.4.4 Watchpoint Error Message

An Error Message occurs when a new message cannot be queued due to the message queue being full. The

FIFO will discard messages until it has completely emptied the queue. Once emptied, an Error Message

will be queued. The error encoding will indicate which type(s) of messages attempted to be queued while

the FIFO was being emptied.

If only a Watchpoint Message attempts to enter the queue while it is being emptied, the Error Message will

incorporate the Watchpoint only error encoding (00110). If an OTM and/or Program Trace Message also

attempts to enter the queue while it is being emptied, the Error Message will incorporate error encoding

(01000).

NOTE

The OVC bits within the DC Register can be set to delay the CPU by

asserting the FIFOFULL signal in order to alleviate (but not eliminate)

potential overruns.

Error information is messaged out in the following format (see Table 11-2):

(8 bits)

(4 bits)

(6 bits)

Watchpoint Source

Src. Proc.

TCODE (001111)

Fixed length = 18 bits

Figure 11-46. Watchpoint Message Format

Table 11-43. Watchpoint Source Description

Watchpoint Source (8-bits)

Watchpoint Description

xxxx xxx1

ARM7 Watchpoint 0

xxxx xx1x

ARM7 Watchpoint 1

xxxx x1xx

Nexus Watchpoint 1

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

(5 bits)

(4 bits)

(6 bits)

Error Code (00110 / 01000)

Src. Proc.

TCODE (001000)

Fixed length = 15 bits

Figure 11-47. Error Message Format

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