Operational Description
Mnemonic Register
(addr. hex)
Meaning
Reaction
Layer-2 Transmit
ISTA (20) Transmit Pool Ready. Further
XPR
XMR
XDU
Write data bytes in the XFIFO if
octets of an HDLC frame can be the frame currently being
written to XFIFO. transmitted is not finished or a
If XIFC was issued (auto mode), new frame is to be transmitted,
indicates that the message was and issue an XIF, XIFC, XTF or
successfully acknowledged with XTFC command. In auto mode
S frame.
applications read the
information in chapter 2.5.5.2.
EXIR (24) Transmit Message Repeat.
Frame must be repeated
Transmission of the frame must
be repeated. No indication to
because of a transmission error layer 3.
(all HDLC message transfer
modes) or a received negative
acknowledgement (auto mode
only) from peer station.
EXIR (24) Transmit Data Underrun. Frame Transmission of the frame must
has been aborted because the be repeated. Possible cause:
XFIFO holds no further data and excessive software reaction
XME (XIFC or XTFC) was not
issued.
times.
RSC
TIN
ISTA (20) Receive Status Change.
A status change from peer
Stop sending new I-frames.
station has been received (RR
or RNR frame), auto mode only.
ISTA (20) Timer Interrupt. External timer
expired or, in auto mode,
Link re-establishment.
Indication to layer 3. (auto
internal timer (T200) and repeat mode)
counter (N200) both
expired.
Semiconductor Group
185
INFINEON [ Infineon ]
