peb2256 Infineon Technologies Corporation, peb2256 Datasheet - Page 205
peb2256
Manufacturer Part Number
peb2256
Description
E1/t1/j1 Framer And Line Interface Component For Long And Short Haul Applications
Manufacturer
Infineon Technologies Corporation
Datasheet
1.PEB2256.pdf
(490 pages)
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8.3
8.3.1
When programmed in the extended transparent mode via the MODE registers
(MODE.MDS(2:0) = 111,
FALC56 performs fully transparent data transmission and reception without HDLC
framing, i.e. without
• flag insertion and deletion
• CRC generation and checking
• Bit stuffing
In order to enable fully transparent data transfer, bit MODE.HRAC (MODE2.HRAC2,
MODE3.HRAC3) has to be set.
Received data is always shifted into RFIFO (RFIFO2, RFIFO3).
Data transmission is always performed out of XFIFO (XFIFO2, XFIFO3) by shifting the
contents of XFIFO into the outgoing data stream directly. Transmission is initiated by
setting CMDR.XTF (04
first byte of the XFIFO is transmitted.
Cyclic Transmission (fully transparent)
If the extended transparent mode is selected, the FALC56 supports the continuous
transmission of the contents of the transmit FIFOs.
After having written 1 to 32 bytes to XFIFO (XFIFO2, XFIFO3), the command
XREP&XTF (CMDR = 00100100 = 24
in XFIFO to the remote end repeatedly.
Note: The cyclic transmission continues until a reset command (CMDR.SRES) is issued
8.3.2
As an option in HDLC mode the internal handling of the received and transmitted CRC
checksum can be influenced via control bits CCR2.RCRC and CCR2.XCRC (channel 2:
CCR3.RCRC2, CCR3.XCRC2, channel 3: CCR4.RCRC3, CCR4.XCRC3).
• Receive Direction
The received CRC checksum is always assumed to be in the 2 last bytes of a frame
(CRC-ITU), immediately preceding a closing flag. If CCR2.RCRC is set, the received
CRC checksum is written to RFIFO where it precedes the frame status byte (contents of
register RSIS). The received CRC checksum is additionally checked for correctness. If
Data Sheet
or with resetting of CMDR.XREP, after which continuous “1”s are transmitted.
During cyclic transmission the XREP-bit has to be set with every write operation
to CMDR.
The same handling applies to CMDR2 and CMDR3 for HDLC channels 2 an 3.
Signaling Controller Functions
Transparent Transmission and Reception
CRC on/off Features
H
). A synchronization byte FF
MODE2.MDS2(2:0)=111,
H
) forces the FALC56 to transmit the data stored
205
Signaling Controller Operating Modes
H
is sent automatically before the
MODE3.MDS3(2:0)=111),
FALC56 V1.2
PEB 2256
2002-08-27
the
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