TLE9221SX Datasheet, PDF (61/91 Pages) Infineon Technologies AG – FlexRay Transceiver

TLE9221SX
Mode Indication, Power-up and Parity Information
13
Mode Indication, Power-up and Parity Information
13.1
Power-up Bit
After switching on the power supplies uV_CC and uV_BAT, the FlexRay transceiver TLE9221SX sets the power-up bit
(bit 3) in the SIR. The power-up bit is visible only by reading out the SIR and will be reset by clearing the SIR (see
Chapter 6.2.3 “Clearing Sequence of SIR”).
13.2
Mode Indication Bit EN and Mode Indication Bit STBN
Two bits in the SIR are reserved for the indication of the operating mode. The SIR indicates the current mode of
operation, regardless of whether the mode is selected via host command, undervoltage flag or wake-up flag. The
mode indication bits have the same order as the host commands. Bit 13 of the SIR reflects the related host
command at the EN pin of the actual mode of operation and bit 14 indicates the related host command at the STBN
pin (compare with Table 17).
Table 17 Mode indication bits
Mode of Operation
Mode Indication Bit EN (bit 13)
BD_Normal
“high”
BD_ReceiveOnly
“low”
BD_Standby
“low”
BD_Sleep
no read-out possible
BD_GoToSleep
no read-out possible
Mode Indication Bit STBN (bit 14)
“high”
“high”
“low”
no read-out possible
no read-out possible
13.3
Even Parity Bit
The even parity bit (bit 15) can be used to check the transmission of the SIR. The even parity bit is set to logical
“low” if the sum of all status bits is even, and it is logical “high” if the sum of all status bits is odd.
Data Sheet
61
Rev. 1.10, 2013-07-15