KIT_TC1797_SK Infineon Technologies, KIT_TC1797_SK Datasheet - Page 71

• Manufacturer Part Number: KIT_TC1797_SK
• Description: KIT STARTER AUDO FUTURE TC1797
• Manufacturer: Infineon Technologies
• Series: Audo Futurer
• Type: MCUr

Specifications of KIT_TC1797_SK

• Contents: Board, Adapters, Cables, CD, Power Supply
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• For Use With/related Products: TC1797
• Other names: KITTC1797SKIN

Errata Sheet
Functional Deviations
OCDS_TC.024 Loss of Connection in DAP three-pin Mode
Devices of the Audo Future family allow tool access via dedicated pins in two
basic protocol modes: DAP and JTAG. To avoid changes to the application
environment, the tool selects the protocol to be used by signalling over the
same pins later used for communication.
Default startup mode is two-pin DAP. Other modes (JTAG or three-pin DAP) are
selected by specific telegrams which need to be sent to the device.
One of the major advantages of DAP versus JTAG within a harsh automotive
environment is its robustness regarding bit errors in the telegram transmission.
This is achieved by adding checksums (CRC) to all telegrams. The only
exception is the telegram to switch from DAP to JTAG (see jtag_mode
telegram), as this telegram is potentially sent by legacy JTAG-only tools not
able to generate properly formatted DAP telegrams.
A method has been implemented to prevent the following safety hole: If bit
errors (e.g. caused by EMC) change another DAP telegram to the telegram
meaning “switch to JTAG mode”, a tool using DAP pins only would loose
connection in an unrecoverable manner. Therefore the DAP module can be
configured by the tool via SFR CBS_OSTATE.DJMODE to ignore the “switch to
JTAG mode” (also called BYPASS) telegram.
Due to an imperfection within the design the intended protection via
CBS_OSTATE.DJMODE does not become effective in three-pin DAP mode
(CBS_OSTATE.DJMODE = 11
).
B
Note: Two-pin DAP mode is not affected.
Workaround
None for three-pin DAP mode.
It
is
recommended
to
select
the
protected
two-pin
DAP
mode
(CBS_OSTATE.DJMODE = 01
) instead if unintentional and non recoverable
B
loss of the tool connection (e.g. due to EMC) shall be prevented safely.
TC1797, EES-AC, ES-AC, AC
71/101
Rel. 1.3, 18.12.2009