PXS20RM Datasheet, PDF (1118/1368 Pages) Freescale Semiconductor, Inc – PXS20 Microcontroller

Nexus Crossbar Slave Port Data Trace Module (NXSS) [cut2/3 only]
33.5.8 Breakpoint/Watchpoint Address Registers 1 and 2 (BWA1 and
BWA2)
The breakpoint/watchpoint address registers are compared with bus addresses to generate internal
watchpoints.
Access: R/W
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
R
BREAKPOINT / WATCHPOINT ADDRESS
W
Reset 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Figure 33-10. Breakpoint / Watchpoint Address Registers (BWA1, BWA2)
33.5.9 Unimplemented registers
Unimplemented registers are those with client select and index value combinations other than those listed
in Table 33-1. For unimplemented registers, the NXSS_0 and NXSS_1 modules drives TDO to zero during
the “SHIFT-DR” state. It also transmits an error message with the invalid access opcode encoding.
33.6 Functional description
33.6.1 TCODEs supported by NXSS_0 and NXSS_1
The NXSS_0 and NXSS_1 pins allow for flexible transfer operations via public messages. A TCODE
defines the transfer format, the number and/or size of the packets to be transferred, and the purpose of each
packet. The IEEE-ISTO 5001-2003 defines a set of public messages. The NXSS_0 and NXSS_1 modules
support the public TCODEs as shown in Table 33-9.
Table 33-9. Public TCODEs supported
Packet size
Message name
bits
Min. Max.
Packet
name
Packet
type
Packet description
Data Trace -
6
Date Write
Message
4
3
6 TCODE Fixed TCODE number = 5
4
SRC Fixed Source processor identifier (multiple Nexus configuration)
3
DSZ Fixed Data size (refer to Table 33-11)
1
32 U-ADDR Variable Unique portion of the data write value
1
64 DATA Variable Data write value
Data Trace -
6
Data Read
Message
4
3
6 TCODE Fixed TCODE number = 6
4
SRC Fixed Source processor identifier (multiple Nexus configuration)
3
DSZ Fixed Data size (refer to Table 33-11)
1
32 U-ADDR Variable Unique portion of the data read value
1
64 DATA Variable Data read value
33-10
PXS20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor