E521.41 Datasheet, PDF (57/89 Pages) ELMOS Semiconductor AG – Transceiver compliant with PSI5 standard v1.3 and v2.1

4 Channel Multi-Mode PSI5 Transceiver
PRODUCTION DATA – Apr 27, 2016
E521.41
Following table shows the bit configuration of UART Frame 1 including ChId, Fid and Err bits.
Table 6.2.4.13-1: PSI5 Data UART Frame1 Bit Configuration
PSI5 data: Configuration of UART Frame 1
Identifier for channel0 (diagnosis)
Identifier for channel1
Error bits Frame ID
xx
xxx
000
xx
xxx
001
Channel ID
Identifier for channel2
Identifier for channel3
Identifier for channel4
Identifier for frame1
Identifier for frame2
xx
xxx
010
xx
xxx
011
xx
xxx
100
xx
000
xxx
xx
001
xxx
Identifier for frame3
xx
010
xxx
Identifier for frame4
xx
011
xxx
Identifier for frame5
Identifier for frame6
Error bit - no error
Error bit - Interface error
Error bit - ASIC error
xx
100
xxx
xx
101
xxx
00
xxx
xxx
01
xxx
xxx
10
xxx
xxx
Error bit - Interface + ASIC error
11
xxx
xxx
6.2.5 XCRC[5:0] Calculation
A 6-bit XCRC for error detection is calculated and added at the last UART/SPI frame, transferred from transceiver
to μC at pin SDO_TXD, for the defined packet frames.
The generator polynomial of the six bit CRC is g(x) = + + + 1 with a binary CRC initialization value "010101".
The transmitter extends the data bits by six zeros (= XCRC default condition) as shown in the figures above. This
augmented data word is fed (LSB first) into the shift registers of the CRC generator.
C0
C1
C2
C3
C4
C5
Input data
T
T
T
T
T
T
1*1
+ 0*X + 0*X² +
1*X³
+
1*X⁴
+ 0*X⁵ + 1*X⁶ = 1 + X³ + X⁴ + X⁶
Figure 6.2.5-1: XCRC-calculation for SPI frames
UART Packet Frames:
The sequence of bit shift into the register for the CRC calculation is shown in below, starting with LSB first. The
number of stuffing bits varies with the payload (not shown in the figures below).
1. Transfer PSI5 Data
LSB
xxx
Channel ID
xxxxxxxxxxxxxx
D0 D1 D2 …… Dn-2 Dn-1 C2 C1 C0
Frame ID Error bits
PSI5 frame data
P/CRC
000
….
Stuffing
MSB
xxxxxx
X0
X5
XCRC; default = zeros
Figure 6.2.5-2: XCRC: Example Transfer PSI5 Data
Elmos Semiconductor AG reserves the right to change the detail specifications as may be required to permit improvements in the design of its products.
Elmos Semiconductor AG
Data Sheet
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QM-No.: 25DS0109E.06