32.5.1 IR Codes
Table 32-5. JTAG Instructions
Instruction
Code[3:0]
Instruction Summary
IDCODE
0000
Selects device identification register for shift
SAMPLE/PRELOAD
0010
Selects boundary scan register for shifting, sampling, and
preloading without disturbing functional operation
SAMPLE
0011
Selects boundary scan register for shifting and sampling
without disturbing functional operation
EXTEST
0100
Selects boundary scan register while applying preloaded
values to output pins and asserting functional reset
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 look at ARM JTAG-DP documentation for more
information on these instructions.
Reserved
All other opcodes
Decoded to select bypass register
1. The manufacturer reserves the right to change the decoding of reserved instruction codes in the future
32.6 JTAG 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 provide a means for 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.
It is important to note that these DAP control and status registers are not memory mapped
within the system memory map and are only accessible via the Debug Access Port (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 32-6. MDM-AP Register Summary
Address
Register
Description
0x0100_0000
Status
Table continues on the next page...
JTAG status and control registers
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