PXR40RM Datasheet, PDF (1327/1434 Pages) Freescale Semiconductor, Inc – PXR40 Microcontroller

Nexus Development Interface (NDI)
Table 31-3. e200z7 OnCE Register Addressing (continued)
OCMD, RS[0:6]
011 0111
011 1000–011 1100
011 1101
011 1110
011 1111
111 0000–111 1001
111 1010
111 1011
111 1100
111 1101
111 1110
111 1111
Register Selected
Debug control register 6 (DBCR6)
Invalid value (do not access)
Debug Data Acquisition Message Register
(DDAM)
Debug Event Control (DEVENT)
Debug External Resource Control (DBERC0)
General purpose register selects [0:9]
Cache Debug Access Control Register
(CDACNTL)
Cache Debug Access Data Register
(CDADATA)
Nexus3-access
LSRL select
Enable_OnCE (and bypass)
Bypass
31.4 NDI Functional Description
31.4.1 Enabling Nexus Clients for TAP Access
After the NDI is out of the reset state, the loading of a specific instruction in the JTAG controller (JTAGC)
block is required to grant the NDI ownership of the TAP. Each Nexus client has its own JTAGC instruction
opcode for ownership of the TAP, granting that client the means to read/write its registers. The JTAGC
instruction opcode for each Nexus client is shown in Table 31-4. After the JTAGC opcode for a client has
been loaded, the client is enabled by loading its NEXUS-ENABLE instruction. The NEXUS-ENABLE
instruction opcode for each Nexus client is listed in Table 31-5. Opcodes for all other instructions
supported by Nexus clients can be found in the relevant sections of this chapter.
Table 31-4. JTAG Client Select Instructions
JTAGC Instruction
ACCESS_AUX_TAP_NPC
ACCESS_AUX_TAP_ONCE
ACCESS_AUX_TAP_eTPU
ACCESS_AUX_TAP_NXDM
ACCESS_AUX_TAP_NXFR
ACCESS_AUX_TAP_NXDM_B
Opcode
Description
10000 Enables access to the NPC TAP controller
10001 Enables access to the e200z7 OnCE TAP controller
10010 Enables access to the eTPU Nexus TAP controller
(eTPU_A, eTPU_B, CDC_AB)
10011 Enables access to the eDMA_A Nexus TAP controller
10100 Enables access to the FlexRay Nexus TAP controller
10111 Enables access to the eDMA_B Nexus TAP controller
Freescale Semiconductor
PXR40 Microcontroller Reference Manual, Rev. 1
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