PEB 2091
PEF 2091
Operational Description
Single Bits
User access to the Single Bits (SB) channel is mode dependent.
In transmit direction there are five possible sources for setting (different) SB: MON-1
messages, MON-2 messages, MON-8 messages, the pins PS1 and PS2 and the state
machine. MON-1, MON-2 and pins PS1 and PS2 can be manipulated directly by the
user. Bits controlled by the state machine can not be manipulated by the user in a direct
way.
In the receive direction the SB are given via MON-1 and MON-2 messages. Several
filtering methods are available. For details see section 4.2.3, page 115.
Note 31: U-interface data is scrambled before it is send to the U-interface and
descrambled when they are received from the U-interface (see
"Scrambler / Descrambler", page 62).
Note 32: The synchronization words (bits 1-18 of each U basic frame) are set by
the transceiver core and can not be manipulated by the user.
Note 33: The CRC channel can not be accessed by the user. These bits are
calculated and set by the transceiver core automatically (see "Cyclic
Redundancy Check (CRC)", page 64). However there are several
methods of monitoring CRC violations, which are discussed in detail in
chapter 4.5, page 176.
4.2.1
Access to Data Channels of U-Interface
Figures 46 and 47 below sketch how data can generally be accessed by the user.
U Basic Frame
1.5 ms
Transmitter
(I)SW
Fixed
18 Bits
Data
12x (2B+D)
216 Bits
M1-M3
3 Bits
M4
1 Bit
M5-M6
2 Bit
Data
(To U)
2B+D
Time
Transmiter
FIFO
From IOM®-2
or µP
Figure 46
Access to Data Transmission on U
Semiconductor Group
108
Data Sheet 01.99
INFINEON [ Infineon ]
