pef20550 Infineon Technologies Corporation, pef20550 Datasheet - Page 314
pef20550
Manufacturer Part Number
pef20550
Description
Extended Line Card Interface Controller Elic
Manufacturer
Infineon Technologies Corporation
Datasheet
1.PEF20550.pdf
(407 pages)
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PEF 20550
Application Hints
This command can also be used to perform a receive only operation: if a message shall
be received without transmission (e.g. after an active monitor channel has been found)
the transmit + receive command is issued with an empty MFFIFO.
The command is applicable for both handshake and non-handshake protocols. Since the
transfer operation is performed on the same timeslot, its use is intended for IOM
applications:
– IOM-2, handshake facility enabled:
The contents of the MFFIFO is sent to the subscriber circuit subject to the IOM-2 protocol
i.e each byte must be acknowledged before the next one is sent. When the MFFIFO is
empty, the ELIC starts to receive the incoming data bytes, each byte being
autonomously acknowledged by the ELIC. Up to 16 bytes may be stored in the MFFIFO.
When the end of message is detected (MX bit inactive during two consecutive frames),
the transfer is considered terminated and an ISTA_E:MFFI interrupt is generated. The
P can then fetch the message from the MFFIFO. In order to determine the length of the
arrived message, the STAR_E:MFFE bit (MFFIFO Empty) should be evaluated before
each read access to the MFFIFO. After all bytes have been read, the MFFIFO must be
reset with the CMDR_E:MFFR command in order to enable new monitor transfer
operations.
Semiconductor Group
314
01.96
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