PXR40RM Datasheet, PDF (1390/1434 Pages) Freescale Semiconductor, Inc – PXR40 Microcontroller

Nexus Development Interface (NDI)
31.17.2.11.1 NXDM and NXFR JTAG DID Register
This JTAG DID register that is included in the NXDM and NXFR modules provides key development
attributes to the development tool concerning the NXDM and NXFR blocks. The register is accessed
through the standard JTAG IR/DR paths. Refer to the PMC chapter.
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 PRN
DC
PIN
MIC
1
W
Reset 0 0 0 0 0 1 1 1 1 1 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 0 1
Figure 31-52. NXDM and NXFR JTAG DID Register
Table 31-44. NXDM and NXFR JTAG DID Field Descriptions
Field
Description
0–3 Embedded part revision number (0x0)
PRN¹
4–9 Freescale design center ID number (0x1F)
DC
10–19 NXDM and NXFR module part identification number, defines the features set. (0x60)
PIN
20–30 Manufacturer identity code
MIC 0x00E Freescale
31 Fixed per JTAG 1149.1
1 Always set
1 _{The revision number is initially 0 and could change in the future.}
31.17.2.11.2 Enabling the NXDM and NXFR TAP Controllers
Assertion of a power-on-reset signal or assertion of the JCOMP pin resets all TAP controllers on the
device. Upon exit from the test-logic-reset state, the IR value is loaded with the JTAG DID. When the
NXDM or NXFR TAP is accessed, this information helps the development tool obtain information about
the Nexus module it is accessing, such as version, sequence, feature set, and so forth.
31.17.2.11.3 NXDM and NXFR Register Access via JTAG
Access to Nexus register resources is enabled by loading a single instruction (NEXUS_ACCESS) into the
JTAG Instruction Register (IR). This IR is part of the IEEE 1149.1 TAP controller within the NXDM and
NXFR modules. Refer to Section 32.4.4, JTAGC Instructions.
After the JTAG NEXUS_ACCESS instruction has been loaded, the JTAG port allows tool/target
communications with all Nexus registers according to the map in Table 31-36.
31-74
PXR40 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor