peb3456e Infineon Technologies Corporation, peb3456e Datasheet - Page 77
![no-image](/images/no-image-200.jpg)
peb3456e
Manufacturer Part Number
peb3456e
Description
Channelized T3 Termination, With Ds3 Framer, M13 Multiplexer, T1/e1 Framers And 256-channel Hdlc/ppp Controller
Manufacturer
Infineon Technologies Corporation
Datasheet
1.PEB3456E.pdf
(424 pages)
- Current page: 77 of 424
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occurs in the internal transmit buffer (because of PCI latency e.g.) an abort sequence
with 7 ‘1’s is transmitted and an underrun interrupt is generated. The abort sequence is
also generated if the host CPU resets or aborts a channel during the transmission of a
frame.
An invert option is provided to invert all the data output or data input between serial line
and protocol machines or vice versa.
The following CRC modes are supported:
• 16 bit CRC
• 32 bit CRC
Optionally CRC transfer and check can be disabled.
4.5.2
•
Figure 4-10 Bit Synchronous PPP with HDLC Framing Structure
Same as HDLC. The handling of the abort sequence differs from that in HDLC mode. If
7E
“1”s. If FF
of 15 “1”s.
The same programmable parameters as in HDLC mode apply to bit synchronous PPP.
4.5.3
This mode uses a frame structure similar to the bit synchronous PPP mode. The frame
begin and end synchronization is performed with the flag character (7E
shared opening and closing flag is supported if programmed in the channel configuration
register. Use of a shared ’0’ bit between two flags is not supported. A 16 or 32 bit CRC
is computed over all service data read from the transmit buffer and appended to the end
of the frame.
The octet synchronous PPP mode uses octet stuffing instead of ‘0’ bit stuffing in order to
replace control characters used by intervening hardware equipment. This allows
transparent transmission and also recognition and removal of spurious characters
inserted by such equipment.
A 32 bit per channel asynchronous control character map (ACCM) specifies characters
in the range 00
the DEL control character (7F
programmable 32 bit register can be selected for character stuffing/destuffing. When a
Data Sheet
H
is programmed as interframe time fill character, the abort sequence consists of 7
0111 1110
Flag
H
Bit Synchronous PPP with HDLC Framing Structure
Octet Synchronous PPP
is programmed as interframe time fill character, the abort sequence consists
H
-1F
1111 1111
Address
1+x+x
1+x
H
to be stuffed/destuffed in service data and FCS field. In addition,
5
+x
2
+x
12
0000 0011
Control
+x
4
+x
H
16
) and any of 4 ACCM extension characters stored in a
5
+x
7
+x
Protocol
8/16 bits
8
+x
10
77
+x
Information
11
+x
12
+x
16
Padding
+x
22
+x
Functional Description
23
16/32 bits
+x
FCS
26
+x
32
PEB 3456 E
0111 1110
H
Flag
). Use of a
05.2001
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