TLE9221SX Datasheet, PDF (20/91 Pages) Infineon Technologies AG – FlexRay Transceiver

TLE9221SX
Host Interface and Status Information Register
STBN
100% uV_IO
50% uV_IO
dENClock dENClock dENClock dENClock
EN
dENTimeout
0% uV_{IO t}
100% uV_IO
50% uV_IO
initialize Host
Interface
enable
SIR
ERRN
ERRN Status
clock out
SIR
SIR
SIR
Bit 0
Bit 1
SIR
Bit 15
0% uV_{IO t}
exit SIR
select operation mode according to
the host command
100% uV_IO
ERRN Status
SIR
Bit 0
50% uV_IO
0% uV_{IO t}
BD_Normal mode
BD_ReceiveOnly
Figure 11 Timing diagram for the SIR readout in BD_Normal mode
During the SIR readout, the EN input acts as the clock and the ERRN output pin acts as the serial “data_out”.
Irrespective of the digital signal at the STBN input, the SIR readout is always initialized by a signal change at the
EN input pin. When the host command BD_Normal is applied to the Host Interface, the SIR read-out starts with
the falling edge at the EN input (see Figure 11). For the host commands BD_Standby and BD_ReceiveOnly the
read-out starts with the rising edge at the EN pin (see Figure 12).
After initialization, the internal timer starts and the TLE9221SX awaits the next signal change within the timing
window dEN_CLOCK(min) < t < dEN_CLOCK(max). The next rising edge¹⁾ enables the SIR and the bits can be clocked
out.
If no signal change occurs after the initialization within the time frame t < dEN_Timeout, the TLE9221SX exits the SIR
readout procedure and changes the operating mode according to the host command applied.
When the SIR is enabled, every falling edge at the EN input serially shifts out the SIR information at the ERRN
output pin. With the first falling edge of the clock at the EN input, the least significant bit, bit 0, is clocked out to the
ERRN output successively followed by bit 1, bit 2, etc, with every successive falling edge of the clock at the EN
input.The SIR bits are “low” active, meaning that the ERRN signal = “low” when the SIR bit is set.
Note: The STBN input pin has no function when the SIR readout is enabled and the readout procedure is running.
Nevertheless, it is recommended to keep the STBN pin stable (“high” or “low”) during the SIR readout
procedure.
1) While the TLE9221SX is in BD_Normal mode, the rising edge is the first signal change after initialization and enables the
SIR readout. For the BD_ReceiveOnly and the BD_Standby mode, there is an additional falling edge between initialization
and the SIR being enabled (compare with Figure 11 and Figure 12).
Data Sheet
20
Rev. 1.10, 2013-07-15