Datasheet

FlexRay Module Registers www.ti.com
26.3.2.1.5 Test Register 1 (TEST1)
Test register 1 holds the control bits to configure the test modes of the FlexRay module. Write access to
these bits is only possible if the WRTEN bit is set. Figure 26-113 and Table 26-99 illustrate this register.
When the FlexRay module is operated in one of its test modes that requires WRTEN to be set (RAM Test
Mode, I/O Test Mode, Asynchronous Transmit Mode, and Loop Back Mode) only the selected test mode
functionality is available.
NOTE: To return from test mode operation to regular FlexRay operation we strongly recommend to
apply a hardware reset (Power on Reset or nReset) to reset all FlexRay internal state
machines to their initial state.
The test functions are not available in addition to the normal operational mode functions, they change the
functions of parts of the FlexRay module. Therefore normal operation as specified outside this chapter and
as required by the FlexRay protocol specification and the FlexRay conformance test is not possible. Test
mode functions may not be combined with each other or with FlexRay protocol functions.
NOTE: The FlexRay module should be kept in CONFIG state, while RAM Test Mode TMC = 01 is
enabled.
The test mode features are intended for hardware testing or for FlexRay bus analyzer tools. They are not
intended to be used in FlexRay applications.
Figure 26-113. Test Register 1 (TEST1) [offset_CC = 10h]
31 28 27 24 23 22 21 20 19 18 17 16
CERB CERA Reserved TXENB TXENA TXB TXA RXB RXA
R-0 R-0 R-0 R/W-0 R/W-0 R/W-0 R/W-0 R-0 R-0
15 10 9 8 7 6 5 4 3 2 1 0
Reserved AOB AOA Reserved TMC Reserved ELBE WRTEN
R-0 R/W-1 R-0 R/W-0 R-0 R/W-0 R/W-0
LEGEND: R = Read only; R/W = Read/Write; -n = value after reset
Table 26-99. Test Register 1 (TEST1) Field Descriptions
Bit Field Value Description
31-28 CERB Coding Error Report Channel B
Set when a coding error is detected on channel B. Reset to zero when register TEST1 is read or
written. Once the CERB is set it will remain unchanged until the Host accesses the TEST1 register
0 No coding error detected.
1h Header CRC error detected.
2h Frame CRC error detected.
3h Frame Start Sequence FSS too long.
4h First bit of Byte Start Sequence BSS seen LOW.
5h Second bit of Byte Start Sequence BSS seen HIGH.
6h First bit of Frame End Sequence FES seen HIGH.
7h Second bit of Frame End Sequence FES seen LOW.
8h CAS / MTS symbol seen too short.
9h CAS / MTS symbol seen too long.
Ah-Fh Reserved
1276
FlexRay Module SPNU563–May 2014
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