Nexus
MPC5565 Microcontroller Reference Manual, Rev. 1.0
Freescale Semiconductor
24-11
24.4
NDI Functional Description
24.4.1
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
. 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
. Opcodes for all other instructions
supported by Nexus clients can be found in the relevant sections of this chapter.
24.4.2
Configuring the NDI for Nexus Messaging
The NDI is placed in disabled mode upon exit of power-on reset. If message transmission via the auxiliary
port is desired, a write to the port configuration register (PCR) located in the NPC is then required to enable
the NDI and select the mode of operation. Asserting MCKO_EN in the PCR places the NDI in enabled
mode and enables MCKO. The frequency of MCKO is selected by writing the MCKO_DIV field.
Asserting or negating the FPM bit selects full-port or reduced-port mode, respectively. When writing to
the PCR, the PCR lsb (least significant bit) must be written to a logic 0. Setting the lsb of the PCR enables
factory debug mode and prevents the transmission of Nexus messages.
Table 24-4. JTAG Client Select Instructions
JTAGC Instruction
Opcode
Description
ACCESS_AUX_TAP_NPC
10000
Enables access to the NPC TAP controller
ACCESS_AUX_TAP_ONCE 10001
Enables
access to the e200z6 OnCE TAP controller
ACCESS_AUX_TAP_DMA 10011
Enables
access
to the eDMA Nexus TAP controller
Table 24-5. Nexus Client JTAG Instructions
Instruction
Description
Opcode
NPC JTAG Instruction Opcodes
NEXUS_ENABLE
Opcode for NPC Nexus Enable instruction (4-bits)
0x0
BYPASS
Opcode for the NPC BYPASS instruction (4-bits)
0xF
e200z6 OnCE JTAG Instruction Opcodes
1
1
Refer to the e200z6 Reference Manual for a complete list of available OnCE instructions.
NEXUS3_ACCESS
Opcode for e200z6 OnCE Nexus Enable instruction (10-bits)
0x7C
BYPASS
Opcode for the e200z6 OnCE BYPASS instruction (10-bits)
0x7F
eDMA Nexus JTAG Instruction Opcodes
NEXUS_ACCESS
Opcode for eDMA Nexus Enable instruction (4-bits)
0x0
BYPASS
Opcode for the eDMA Nexus BYPASS instruction (4-bits)
0xF
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