PEB2075 INFINEON [Infineon Technologies AG], PEB2075 Datasheet - Page 43

• Manufacturer Part Number: PEB2075
• Description: ICs for Communications Extended PCM Interface Controller
• Manufacturer: INFINEON [Infineon Technologies AG]

3.5.2.3 Initialization of Pre-processed Channels
After the CM reset, all CFI time slots are unassigned. If the CFI is used as a plain PCM
interface, i.e. containing only switched channels (B channels), the initialization steps
below are not required. The initialization of pre-processed channels applies only to IOM
or SLD applications.
An IOM or SLD “channel” consists of four consecutive time slots. The first two time slots,
the B channels need not be initialized since they are already set to unassigned channels
by the CM reset command. Later, in the application phase of the software, the B
channels can be dynamically switched according to system requirements. The last two
time slots of such an IOM or SLD channel, the pre-processed channels must be
initialized for the desired functionality. There are four options that can be selected:
Table 2
Pre-processed Channel Options at the CFI
Even CFI Time Slot
Monitor/feature control channel
Monitor/feature control channel
Monitor/feature control channel
Monitor/feature control channel
Also refer to figure 19.
Example
In CFI-mode 0 all four CFI-ports shall be initialized as IOM-2 ports with a 4-bit C/I-field
and decentral D channel handling.
CFI time slots 0, 1, 4, 5, 8, 9
initialized.
CFI time slots 2, 3, 6, 7, 10, 11,
need to be initialized:
Semiconductor Group
28, 29 of each port are B channels and need not to be
Odd CFI Time Slot
4-bit C/I channel, D channel not
switched (decentral D channel
handling)
4-bit C/I channel, D channel
switched (central D ch. handling)
6-bit SIG channel
8-bit SIG/channel
30, 31 of each port are pre-processed channels and
43
Operational Description
Main
Application
IOM-1 or IOM-2
digital subscriber
IOM-1 or IOM-2
digital subscriber
IOM-2, analog
subscriber
SLD, analog
subscriber
PEB 2055
PEF 2055