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UM0434

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12.9.2

Watchpoint messaging

Enabling watchpoint messaging is done by setting the watchpoint enable bit in the DC1

module. The e200z3 Nexus1 module is capable of setting multiple address and/or data

watchpoints. Please refer to

Chapter 11: Debug support on page 296,” for details on

watchpoint initialization.

When these watchpoints occur, a watchpoint event signal from the Nexus1 module causes a

message to be sent to the queue to be messaged out. This message includes the

watchpoint number indicating which watchpoint caused the message.

The occurrence of any of the e200z3-defined watchpoints can be programmed to assert the

event out,

nex_evto_b, pin for one period of the output clock, nex_mcko; see Table 271 for

details on

nex_evto_b.

Watchpoint information is messaged out in the format shown in

Table 264:

Table 264.

Watchpoint message format.

12.9.3

Watchpoint error message

An error message occurs when the message queue is full and a new message cannot be

queued. The FIFO discards messages until it has completely emptied the queue. Once

emptied, an error message is queued. The error encoding indicates which types 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 incorporates the watchpoint-only error encoding, 00110. If an OTM and/or

program trace and/or data trace message also attempts to enter the queue while it is being

emptied, the error message incorporates error encoding 01000.

Note:

DC1[OVC] can be set to delay the CPU in order to alleviate, but not eliminate, potential

overrun situations.

(8 bit)

(4 bits)

(6 bits)

Watchpoint Source

Source Process

TCODE (001111)

Fixed length = 18 bits

Table 265.

Watchpoint source encoding

Watchpoint source (8-Bits)

Watchpoint description

0000_0001

e200z3 watchpoint #0 (IAC1 from Nexus1)

0000_0010

e200z3 watchpoint #1 (IAC2 from Nexus1)

0000_0100

e200z3 watchpoint #2 (IAC3 from Nexus1)

0000_1000

e200z3 watchpoint #3 (IAC4 from Nexus1)

0001_0000

e200z3 watchpoint #4 (DAC1 from Nexus1)

0010_0000

e200z3 watchpoint #5 (DAC2 from Nexus1)

0100_0000

e200z3 watchpoint #6 (DCNT1 from Nexus1)

1000_0000

e200z3 watchpoint #7 (DCNT2 from Nexus1)

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