pef20550 Infineon Technologies Corporation, pef20550 Datasheet - Page 311
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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5.5.3.2 Description of the MF Channel Commands
Transmit Command
The transmit command can be used for sending MF data to a single subscriber circuit
when no answer is expected. It is applicable for both handshake and non handshake
protocols. The message (up to 16 bytes) can be written to the MFFIFO after interrogation
of the STAR_E register. After writing of the MF channel address to MFSAR the transfer
can be started using the transmit command (CMDR_E = 04
). The contents of the
H
MFFIFO will then be transmitted byte by byte to the subscriber circuit.
If the handshake facility is disabled (IOM-1/SLD), the data is sent at a speed of one byte
per frame.
If the handshake facility is enabled (IOM-2), each data byte must be acknowledged by
the subscriber circuit before the next one is sent. The transfer speed depends therefore
on the reaction time of the subscriber circuit. The ELIC can transmit a message at a
maximum speed of one byte per two frames.
In order to avoid blocking the software when a subscriber circuit fails to acknowledge a
message, a software time out, which resets the monitor transfer (CMDR_E = 01
)
H
should be implemented.
If the remote partner aborts the reception of an arriving message i.e. if the ELIC detects
an inactive MR bit during at least two consecutive frames, the transmit operation will be
stopped, the ISTA_E:MFFI interrupt will be generated and the STAR_E:MFAB bit will be
set to 1. The CMDR_E:MFFR bit should then be set to clear the MFAB bit before the next
transfer.
When all data bytes of the MFFIFO have been sent (and eventually acknowledged) the
ELIC generates an ISTA_E:MFFI interrupt indicating the end of the transfer. The MF
handler may then be pointed to another subscriber address for another monitor transfer.
Semiconductor Group
311
01.96
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