PEB 2091
PEF 2091
Operational Description
4.2
Access to U-Interface
The U-frame is not directly accessible by the user. Communication with the U-interface
will be established using the user interfaces IOM®-2, µP (if used) or pins. This chapter
shows how this can be done for both receive and transmit directions. Figures 44 and 45
sketch the available ways of access to the different channels of the U-interface data in
both directions. For more details about the structure of the U-frame, see "U -Frame
Structure", page 67. For blocks’ functions, see "System Interface Unit", page 62.
In addition, Section 4.2.4, page 124, describes how the U-interface superframe marker
can be set and indicated.
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)
Time
Transmiter
FIFO
2B+D1)
EOC
Processor
MON-01)
MON-11)2)
MON-21)
PS1,PS22)
Single Bits
Processor
(2B+D &
M4)3)
CRC
Processor
1) From IOM®-2 or µP
2) Applies only in NT modes
3) From the last U superframe.
Not directly accessable to user
Figure 44
Channels of Access to U-Interface (Transmitter)
Semiconductor Group
106
Data Sheet 01.99
INFINEON [ Infineon ]
