The On-chip debug support is considered being private JTAG instructions and to selected third-party vendors only. Instruction opcodes are listed for reference.
PRIVATE0; 0x8
Private JTAG instruction for accessing On-chip Debug system.
PRIVATE1; 0x9
Private JTAG instruction for accessing On-chip Debug system.
PRIVATE2; 0xA
Private JTAG instruction for accessing On-chip Debug system.
PRIVATE3; 0xB
Private JTAG instruction for accessing On-chip Debug system.