UM0306 Debug support (DBG)
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There are many AP Registers (see AHB-AP) addressed as the combination of:
● The shifted value A[3:2]
● The current value of the DP SELECT register
20.9 AHB-AP (AHB Access Port) - valid for both JTAG-DP or SW-
DP
Features:
● System access is independent of the processor status.
● Either SW-DP or JTAG-DP accesses AHB-AP.
● The AHB-AP is an AHB master into the Bus Matrix. Consequently, it can access all the
data buses (Dcode Bus, System Bus, internal and external PPB bus) but the ICode
bus.
● Bitband transactions are supported.
● AHB-AP transactions bypass the FPB.
The address of the 32-bits AHP-AP resisters are 6-bits wide (up to 64 words or 256 bytes)
and consists of:
a) Bits [8:4] = the bits[7:4] APBANKSEL of the DP SELECT register
b) Bits [3:2] = the 2 address bits of A(3:2) of the 35-bit packet request for SW-DP.
The AHB-AP of the Cortex-M3 includes 9 x 32-bits registers:
Refer to the Cortex-M3 r1p1 TRM for further details.
20.10 Core debug
Core debug is accessed through the core debug registers. Debug access to these registers
is by means of the Advanced High-performance Bus (AHB-AP) port. The processor can
access these registers directly over the internal Private Peripheral Bus (PPB).
Address
offset
Register Name Notes
0x00
AHB-AP Control and
Status Word
Configures and controls transfers through the AHB
interface (size, hprot, status on current transfer, address
increment type
0x04 AHB-AP Transfer Address
0x0C AHB-AP Data Read/Write
0x10 AHB-AP Banked Data 0
Directly maps the 4 aligned data words without rewriting
the Transfer Address Register.
0x14 AHB-AP Banked Data 1
0x18 AHB-AP Banked Data 2
0x1C AHB-AP Banked Data 3
0xF8 AHB-AP Debug ROM Address Base Address of the debug interface
0xFC AHB-AP ID Register
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