PEF82912FV14XP Lantiq, PEF82912FV14XP Datasheet - Page 60

• Manufacturer Part Number: PEF82912FV14XP
• Manufacturer: Lantiq

Specifications of PEF82912FV14XP

• Number Of Line Interfaces: 1
• Control Interface: HDLC
• Lead Free Status / Rohs Status: Supplier Unconfirmed

• Since a double last-look criterion is implemented the receiver is able to receive the
• To control this handshake procedure a collision detection mechanism is implemented
• Monitor data will be transmitted repeatedly until its reception is acknowledged or the
• Two frames with the MX bit in the inactive state indicates the end of a message
• Transmission and reception of monitor messages can be performed simultaneously.
2.3.3.2
In case the device does not detect identical monitor messages in two successive frames,
transmission is not aborted. Instead the device will wait until two identical bytes are
received in succession.
A transmission is aborted by the device if
• an error in the MR handshaking occurs
• a collision on the IOM -2 bus of the MONITOR data or MX bit occurs
• the transmission time-out timer expires
A reception is aborted by the device if
• an error in the MX handshaking occurs or
• an abort request from the opposite device occurs
MX/MR Treatment in Error Case
In the master mode the MX/MR bits are under control of the microcontroller through MXC
or MRC, respectively. An abort is indicated by an MAB interrupt or MER interrupt,
respectively.
In the slave mode the MX/MR bits are under control of the device. An abort is always
indicated by setting the MX/MR bit inactive for two or more IOM -2 frames. The
controller must react with EOM.
Figure 21
an example for an abort requested by the transmitter and
for a successful transmission.
Data Sheet
MON slot data at least twice (in two consecutive frames), the receiver waits for the
acknowledge of the reception of two identical bytes in two successive frames.
in the transmitter. This is done by making a collision check per bit on the transmitted
MONITOR data and the MX bit.
transmission time-out timer expires.
(EOM).
This feature is used by the device to send back the response before the transmission
from the controller is completed (the device does not wait for EOM from controller).
shows an example for an abort requested by the receiver,
Error Treatment
46
Figure 23
Functional Description
PEF 82912/82913
shows an example
Figure 22
2001-03-30
shows