PSB2115FV1.2D Lantiq, PSB2115FV1.2D Datasheet - Page 191

• Manufacturer Part Number: PSB2115FV1.2D
• Manufacturer: Lantiq

Specifications of PSB2115FV1.2D

• Lead Free Status / Rohs Status: Supplier Unconfirmed

PSB 2115
PSF 2115
Operational Description
The IPAC supplies IOM timing signals as long as there is no DIU command in the C/I
(C/I0) channel. If timing signals are no longer required and activation is not yet
requested, this is indicated by programming DIU in the CIX0 register.
As an alternative to activation via DU, the IOM interface can be activated by setting the
CFS bit to "0". The activation of FSC and DCL in this case is similar to figure 91. Note
that the IOM interface can be deactivated through DIU (power-down state, figure 90)
only if CFS is set to logical "1".
3.6.2
Activation/Deactivation of S/T Interface
Assuming the IPAC has been initialized with the required features of the application, it is
now ready to transmit and receive messages in the D channel (LAPD support).
But as a prerequisite, the layer 1 has to be activated.
The layer-1 functions are controlled by commands issued via the CIX0 register. These
commands, sent over the IOM C/I channel 0 to layer 1, trigger certain procedures, such
as activation/deactivation, switching of test loops and transmission of special pulse
patterns. These are governed by layer-1 state diagrams in accordance with ITU I.430.
Responses from layer 1 are obtained by reading the CIR0 register after a CIC interrupt
(ISTAD).
The state diagrams are shown in the following figures. The activation/deactivation
implemented by the IPAC in its different operating modes agrees with the requirements
set forth in ITU recommendations. State identifiers F1-F8 (TE/LT-T) and G1-4 (LT-S) are
in accordance with ITU I.430.
State machines are the key to understanding the IPAC in different operational modes.
They include all information relevant to the user and enable him to understand and
predict the behaviour of the IPAC. The informations contained in the state diagrams are:
– state name (based on ITU I.430)
– S/T signal transmitted
– C/I code received
– C/I code transmitted
– transition criteria
The coding of the C/I commands and indications are described in detail in chapter 3.6.6.
Semiconductor Group
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