56
6437E–ATARM–23-Apr-13
SAM9M11
10.6.4
Debug Unit
The Debug Unit provides a two-pin (DXRD and TXRD) USART that can be used for several
debug and trace purposes and offers an ideal means for in-situ programming solutions and
debug monitor communication. Moreover, the association with two peripheral data controller
channels permits packet handling of these tasks with processor time reduced to a minimum.
The Debug Unit also manages the interrupt handling of the COMMTX and COMMRX signals
that come from the ICE and that trace the activity of the Debug Communication Channel.The
Debug Unit allows blockage of access to the system through the ICE interface.
A specific register, the Debug Unit Chip ID Register, gives information about the product version
and its internal configuration.
The SAM9M11 Debug Unit Chip ID value is 0x819B 05A2 and the extended ID is 0x00000002
on 32-bit width.
For further details on the Debug Unit, see the Debug Unit section.
10.6.5
IEEE 1149.1 JTAG Boundary Scan
IEEE 1149.1 JTAG Boundary Scan allows pin-level access independent of the device packaging
technology.
IEEE 1149.1 JTAG Boundary Scan is enabled when JTAGSEL is high. The SAMPLE, EXTEST
and BYPASS functions are implemented. In ICE debug mode, the ARM processor responds
with a non-JTAG chip ID that identifies the processor to the ICE system. This is not IEEE 1149.1
JTAG-compliant.
It is not possible to switch directly between JTAG and ICE operations. A chip reset must be per-
formed after JTAGSEL is changed.
A Boundary-scan Descriptor Language (BSDL) file is provided to set up test.
10.6.6
JID Code Register
Access:
Read-only
VERSION[31:28]: Product Version Number
Set to 0x0.
PART NUMBER[27:12]: Product Part Number
Product part Number is 5B27
MANUFACTURER IDENTITY[11:1]
Set to 0x01F.
Bit[0] required by IEEE Std. 1149.1.
Set to 0x1.
JTAG ID Code value is 05B2_703F.
31
30
29
28
27
26
25
24
VERSION
PART NUMBER
23
22
21
20
19
18
17
16
PART NUMBER
15
14
13
12
11
10
9
8
PART NUMBER
MANUFACTURER IDENTITY
76543210
MANUFACTURER IDENTITY
1