PEF80912HV14XT Lantiq, PEF80912HV14XT Datasheet - Page 23

• Manufacturer Part Number: PEF80912HV14XT
• Manufacturer: Lantiq

Specifications of PEF80912HV14XT

• Lead Free Status / Rohs Status: Supplier Unconfirmed

2.3
The state machine of the U-Transceiver is based on the NT state machine in the PEB /
PEF 8091 documentation [11].
Basic configurations are selected via pin strapping.
2.3.1
Transmission on the U
is reducing two bits to one quaternary symbol (2B1Q).
Data is grouped together into U-superframes of 12 ms each. Each superframe consists
of eight basic frames which begin with a synchronization word and contain 222 bits of
information. The first basic frame of a superframe starts with an inverted synchword
(ISW) compared to the other basic frames (SW). The structure of one U-superframe is
illustrated in
Figure 5
•
Figure 6
Out of the 222 information bits 216 contain 2B + D data from 12 IOM
remaining 6 bits are used to transmit maintenance information. Thus 48 maintenance
bits are available per U-superframe. They are used to transmit two EOC-messages (24
bit), 12 Maintenance (overhead) bits and one checksum (12 bit).
Data Sheet
<---12 ms--->
<---1,5 ms--->
ISW
(I) SW
(Inverted) Synch Word
18 Bit (9 Quat)
1. Basic Frame
U-Transceiver
2B1Q Frame Structure
Figure 5
U-Superframe Structure
U-Basic Frame Structure
and
2B1Q
Figure
SW
-interface is performed at a rate of 80 kbaud. The code used
12
User Data
216 Bits (108 Quat)
6.
2. Basic Frame
2B + D
15
. . .
M1 – M6
Maintenance Data
6 Bits (3 Quat)
SW
Functional Description
PEF 80912/80913
8. Basic Frame
®
-frames, the
2001-03-29