TLE9221SX Datasheet, PDF (19/91 Pages) Infineon Technologies AG – FlexRay Transceiver

TLE9221SX
Host Interface and Status Information Register
6.2
Status Information Register
6.2.1 Definition of the Status Information Register
Failure, wake-up and diagnostic information is stored internally in a 16-bit wide register in the TLE9221SX, the so-
called Status Information Register, or abbreviated to SIR (see Table 7).
Table 7 Bit definition of the Status Information Register¹⁾
Bit
Description
Bit 0
local wake-up bit
Bit 1
remote wake-up bit
Bit 2
reserved, always “high”
Bit 3
power-up bit
Bit 4
bus error bit
Bit 5
overtemperature error bit
Bit 6
overtemperature warning bit
Bit 7
Transmitter time-out bit
Bit 8
Bit 9
Bit 10
Bit 11
V_BAT undervoltage bit
V_CC undervoltage bit
V_IO undervoltage bit
error bit
Bit 12
wake-up source bit
Bit 13
EN mode indication bit
Bit 14
STBN mode indication bit
Bit 15
even parity bit
1) The bits are “low” active. For example bit = 0, when set.
Summary Flag / Bit
wake-up flag,
wake-up flag,
–
–
error bit
error bit
error bit
error bit
error bit
error bit
error bit
–
–
–
–
–
6.2.2 SIR Readout Mechanism
The SIR is a “read-only” register and the data can be read out serially by using EN input as a data clock. While the
SIR readout procedure is running, no operation mode change applies to the TLE9221SX. This allows regular data
communication and read-out of the SIR at the same time.
Like all the other functions using the Host Interface, the reference supply uV_IO needs to be operational to read out
the SIR.
The SIR readout is possible in all non-low power modes and in BD_Standby mode (see Table 8).
Table 8 Readout mechanism and modes of operation
Modes of Operation
Active / Not Active
BD_Normal
active
BD_ReceiveOnly
active
BD_GoToSleep Command
not active
BD_Standby
active
BD_Sleep
not active
Note: The SIR readout depends on the current operating mode selected and not on the host command applied. In
case of undervoltage events, the host command could be BD_Normal mode, but the operating mode is
BD_Sleep mode. In BD_Sleep mode, no SIR read-out is possible.
Data Sheet
19
Rev. 1.10, 2013-07-15