pef20320 Infineon Technologies Corporation, pef20320 Datasheet - Page 77

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

Figure 40
Note: 1.
User’s Manual
1. For FNUM –
– the kind of Frame Check Sequence (FCS)
– the suppression of the automatic generation of the FCS is programmable in
– CS = 0:
-- -
8
x
two kinds of frame check sequences are implemented by the CRC bit in the
channel specification
CRC = 0: the generator polynomial x
CRC = 1: the generator polynomial x
the channel specification:
CS = 1:
CSM = 0: FCS generated automatically if CS = 0 in the
CSM = 1: FCS generation suppressed
is the biggest integer smaller than .
FCS generated automatically
FCS generation suppressed
and in the transmit descriptor
channel specification
(2 byte FCS of CCITT Q.921)
(4 byte FCS) is used
-- -
8
x
… x
y=
FE=1
7 E
< 0, y = 0
max (FNUM -
H
10
FNUM
Insertions
+ x
Frame 1
x Zero
8
+ x
[
x
8
Contents
Frame 1
7
],
7
Data
+ x
0)
of
E
H
5
. . . . . . 7 E
77
+ x
y+1
4
+ x
16
32
H
2
-- -
8
x
+
+ x
+ x + 1
Frame 2
12
26
+ x
Contents
Frame 2
+ x
Data
of
ITD04579
5
23
+ 1 is used
+ x
Functional Description
22
+ x
16
+ x
PEB 20320
12
+ x
01.2000
11
+ …