NXP Semiconductors PXN2020 - 36.7.9.4 Watchpoint Support

Nexus Development Interface (NDI)
PXN20 Microcontroller Reference Manual, Rev. 1
36-94 Freescale Semiconductor
Figure 36-73. Program Trace (MDO = 2)—Indirect Branch Message (History)
Figure 36-74. Program Trace—Direct Branch (Traditional) and Error Messages
Figure 36-75. Program Trace—Indirect Branch with Sync. Message
36.7.9.4 Watchpoint Support
This section details the watchpoint features of the Nexus2+ module.
36.7.9.4.1 Overview
The Nexus2+ module provides watchpoint messaging via the auxiliary pins, as defined by the IEEE-ISTO
5001-2003 standard.
MDO[1:0]
TCODE = 28
MCKO
MSEO
Source Processor = 0b0000
Number of Sequential Instructions = 0
Relative Address = 0xA5
Branch History = 0b1010_0101 (with Stop)
11 01 00 00 00 01 01 10 10 01 01 10 1000 00
Note: This is representative only. The PXN20 supports only Full-Port Mode with 12 MDO pins.
MDO[1:0]
DBM:
MCKO
MSEO
TCODE = 3
Source Processor = 0b0000
Number of Sequential Instructions = 3
00 00 00 00 11 00 00 10 00 00 00 01 00 00
Error:
TCODE = 8
Source Processor = 0b0000
Error Code = 1 (Queue Overrun – BTM Only)
ErrorDirect Branch
11
Note: This is representative only. The PXN20 supports only Full-Port Mode with 12 MDO pins.
MDO[1:0]
TCODE = 12
MCKO
MSEO
Source Processor = 0b0000
Number of Sequential Instructions = 3
Full Target Address = 0xDEAD_FACE
00 11 00 00 00 11 10 11 00 11 10 10 11 11 01 11 10 10 10 11 01 11 00
Note: This is representative only. The PXN20 supports only Full-Port Mode with 12 MDO pins.