TLE9221SX Datasheet, PDF (22/91 Pages) Infineon Technologies AG – FlexRay Transceiver

TLE9221SX
Host Interface and Status Information Register
Note: Applying TLE9221SX the host command BD_Normal does not necessarily clear the SIR, since entering
BD_Normal mode can be prevented by an undervoltage event (see Table 12).
6.3
Status Information at the ERRN Output Pin
The ERRN output pin functions as a serial “data-out” during the SIR readout procedure. In any other case, the
ERRN output pin indicates the status information. According to the FlexRay EPL Specification, version 3.0.1, the
ERRN pin indicates failure, wake-up events and the wake-up source.
The host command applied determines the incident that is signed at the ERRN output pin. The ERRN output pin
is active “low” (details see Table 9).
.
Table 9
Signaling at ERRN
STBN EN
Host Command Error
Bit¹⁾
Wake-
up
Flag¹⁾
ERRN
Condition
Error Indication
“high” “high” BD_Normal
“high” X²⁾
“high” –
“high” “high” BD_Normal
“low” X
“low” –
“high” “low” BD_ReceiveOnly “high” “high” “high” –
“high” “low” BD_ReceiveOnly “low” “high” “low” –
Wake-up Source Indication
“high” “low” BD_ReceiveOnly X
“low” “high” wake-up source bit = “high”
“high” “low” BD_ReceiveOnly X
“low” “low” wake-up source bit = “low”
Wake-up Indication
“low”
“high” BD_GoToSleep X
command
“high” “high” automatically transferred to BD_Sleep
“low”
“high” BD_GoToSleep X
command
“low” “low” automatically transferred to BD_Sleep
“low” “low” BD_Standby
X
“high” “high” –
“low” “low” BD_Standby
X
“low” “low” –
“low” X
BD_Sleep
X
“high” “high” –
“low” X
BD_Sleep
X
“low” “low” –
1) “Low” active, the error bit and the wake-up flag are set while active “low”.
2) “X” = don’t care.
Note: The status signal at the ERRN output depends directly on the host command applied. Since the selection of
the operation mode doesn’t implicitly depend on the host command but also on failure cases and wake-up
events, it is possible that the TLE9221SX is in BD_Sleep mode while the host command BD_Normal mode
is applied to the Host Interface (details see also Table 14, Table 15 and Table 16).
As an example in Figure 13 the TLE9221SX indicates the error flag while the device is in BD_Sleep mode due to
an undervoltage event on uV_BAT.
Data Sheet
22
Rev. 1.10, 2013-07-15