pef20320 Infineon Technologies Corporation, pef20320 Datasheet - Page 80

• Manufacturer Part Number: pef20320
• Description: Multichannel Network Interface Controller For Hdlc With 32 Channels
• Manufacturer: Infineon Technologies Corporation

User’s Manual
For CS = 1 (CRC select) the transmitted data stream would differ at FCS, FCS would just
be omitted.
For INV = 1 (channel inversion) all bits of the data stream (including FLAG, DATA, FCS,
ITF) would be inverted.
For CRC = 1 (CRC 32) the transmitted data stream would only differ in the FCS, the FCS
would be 1101 0111 1010 0101 1000 0000 0010 0111.
For FA = 0 (no flag adjustment) the transmitted data stream would change only after
DATA 2. The value FNUM = 1 in the second descriptor would alone determine the
number of interframe time-fill characters, the scenario would look like
Figure 42
For IFTF = 0 (ITF flags) the transmitted data stream would only differ at ITF, the 8 ones
would be replaced by 0111 1110.
For Motorola interface the only difference is in the data section
For the first descriptor it ought to be
31
and for the second
31
and for the third
31
AA
FF FF FF FF
FF 00
AA 28 FA
5. No FCS is generated here as CSM is ‘1’ for the second and third transmit
6. There was 8 zero insertions in the 2
descriptor. The FCS is supposed to be the last 2 bytes to be transmitted in this
case, their validity is not checked internally.
Therefore between the second and the third frame we
have a shared FLAG.
DATA 2
0
0
0
0111 111
FLAG
0111 111
FLAG
80
nd
frame, so FNUM –
DATA 3
Functional Description
8
-- -
8
= FNUM – 1 = 0.
PEB 20320
01.2000