PEF81902FV1.1 Lantiq, PEF81902FV1.1 Datasheet - Page 139

• Manufacturer Part Number: PEF81902FV1.1
• Manufacturer: Lantiq

Specifications of PEF81902FV1.1

• Lead Free Status / RoHS Status: Supplier Unconfirmed

3.2.2.1
When receiving the request for a complete loopback, the U transceiver passes it on to
the downstream device, e.g. the S-bus transceiver. This is achieved by issuing the C/I-
code AIL in the “Transparent” state or C/I = ARL in states different than “Transparent”
•
Figure 60
The complete loopback is either opened under control of the exchange via the
maintenance channel or locally controlled via the µC. No reset is required for loopback
#2. The line stays active and is ready for data transmission.
3.2.2.2
Single channel loopbacks are always performed directly in the U-Transceiver. No
difference between the B1-channel and the B2-channel loopback control procedure
exists.
3.2.3
Besides the standardized remote loopbacks the U-transceiver features additional local
loopbacks for enhanced test and debugging facilities. The local loopbacks that are
featured by register LOOP are shown in
itself and can be activated regardless of the current operational status.
By the LOOP register it can be configured whether the loopback is closed only for the B1
and/or B2 or for 2B+D channels and whether the loopback is closed towards the internal
IOM
By default the loopbacks are set to transparent mode. In transparent mode the data is
both passed on and looped back. In non-transparent mode the data is not forwarded but
substituted by 1s (idle code).
Data Sheet
â
-2 interface or towards the U-Interface.
S-Transceiver
2B+D
Complete Loopback
Loopback No.2 - Single Channel Loopbacks
Local Loopbacks Featured By the LOOP Register
Complete Loopback Options in NT-Mode
loop request
Controller
Figure
125
loop command
61. They are closed in the U-transceiver
U-Transceiver
2 B+D
Operational Description
loop command
U
lp2bymon8.vsd
PEF 81902
2001-11-12