PEF20550HV21XT Lantiq, PEF20550HV21XT Datasheet - Page 311

• Manufacturer Part Number: PEF20550HV21XT
• Manufacturer: Lantiq

Specifications of PEF20550HV21XT

• Lead Free Status / Rohs Status: Supplier Unconfirmed

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
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.
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
Semiconductor Group
311
H
). The contents of the
Application Hints
PEB 20550
PEF 20550
01.96
H
)