Table 50-6. JTAG instructions (continued)
Instruction
Code[3:0]
Instruction summary
HIGHZ
1001
Selects bypass register while three-stating all output pins and
asserting functional reset
CLAMP
1100
Selects bypass register while applying preloaded values to
output pins and asserting functional reset
Arm_IDCODE
1110
Arm JTAG-DP Instruction
BYPASS
1111
Selects bypass register for data operations
Factory debug reserved
0101, 0110, 0111, 1101 Intended for factory debug only
Arm JTAG-DP Reserved
1000, 1010, 1011, 1110 These instructions will go the Arm JTAG-DP controller.
Please see the Arm JTAG-DP documentation for more
information on these instructions.
Reserved
All other opcodes
Decoded to select bypass register
1. Device IDCODE can only be read in JTAG mode
2. The manufacturer reserves the right to change the decoding of reserved instruction codes in the future
50.6 MDM-AP status and control registers
Through the Arm Debug Access Port (DAP), the debugger has access to the status and
control elements, implemented as registers on the DAP bus as shown in
These registers provide additional control and status for low power mode recovery and
typical run-control scenarios. The status register bits also allow the debugger to get
updated status of the core without having to initiate a bus transaction across the crossbar
switch, thus remaining less intrusive during a debug session.
These DAP control and status registers are not memory mapped within the system
memory map and are only accessible via the DAP using JTAG or SWD. The MDM-AP is
accessible as Debug Access Port 1 with the available registers shown in the table below.
Table 50-7. MDM-AP register summary
Address
Register
Description
0x0100_0000
Status
See
0x0100_0004
Control
See
0x0100_00FC
ID
Read-only identification register that always reads as 0x001C_0000
MDM-AP status and control registers
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