peb2255 Infineon Technologies Corporation, peb2255 Datasheet - Page 171

• Manufacturer Part Number: peb2255
• Description: E1/t1/j1 Framer And Line Interface Component For Long And Short Haul Applications
• Manufacturer: Infineon Technologies Corporation

8.1.5
The frames can be transmitted as shown below.
Figure 57
Transmitting a HDLC frame via register CMDR.XHF, the address, the control fields and
the data field have to be entered in the XFIFO.
If CCR3.XCRC is set, the CRC checksum will not be generated internally. The checksum
has to be provided via the transmit FIFO (XFIFO) as the last two bytes. The transmitted
frame is closed automatically with a closing flag only.
The FALC
to be transmitted makes sense or not.
8.2
Characteristics: fully transparent
In no HDLC mode, fully transparent data transmission/reception without HDLC framing
is performed, i.e. without FLAG generation/recognition, CRC generation/check, or bit-
stuffing. This feature can be profitably used e.g. for:
• Specific protocol variations
• Transmission of a BOM frame
• Test purposes
Data transmission is always performed out of the XFIFO. In transparent mode, the
receive data is shifted into the RFIFO.
Data Sheet
Transmit
HDLC
Frame
(XHF)
®
Transmit Data Flow
-LH does not check whether the length of the frame, i.e. the number of bytes
Extended Transparent Mode
HDLC Transmit Data Flow of FALC
FLAG
ADDRESS
ADDR
XFIFO
CONTROL
CTRL
171
Signaling Controller Operating Modes
DATA
®
-LH
CHECKRAM
CRC
FALC-LH V1.3
ITD06456
PEB 2255
FLAG
2000-07