PEF2015 datasheet(30/84 Pages) INFINEON

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PEF 2015

Operational Description

Semiconductor Group

12.97

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

Also refer to figure 9.

Example

In CFI-mode 0 the CFI-port shall be initialized as IOM-2 port with a 4-bit C/I-field.

CFI time slots 0, 1, 4, 5, 8, 9

… 28, 29 are B-channels and need not to be initialized.

CFI time slots 2, 3, 6, 7, 10, 11,

…, 30, 31 are pre-processed channels and need to be

initialized:

Even CFI Time Slot

Odd CFI Time Slot

Main

Application

Monitor/feature control channel

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

IOM-1 or IOM-2

digital subscriber

IOM-1 or IOM-2

digital subscriber

IOM-2, analog

subscriber

SLD, analog

subscriber

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