PEF82912FV1.4 Infineon Technologies, PEF82912FV1.4 Datasheet - Page 109
PEF82912FV1.4
Manufacturer Part Number
PEF82912FV1.4
Description
ISDN Interface ISDN
Manufacturer
Infineon Technologies
Datasheet
1.PEF82912FV1.4.pdf
(240 pages)
Specifications of PEF82912FV1.4
Mounting Style
SMD/SMT
Package / Case
MQFP-64
Lead Free Status / Rohs Status
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Synchronized 2
In this state the U-transceiver has received UOA = 1. This is a request to activate the
downstream device.
Test
The test signal SP is issued as long as C/I=SSP is applied. For further details see
Table
Transparent
This state is entered upon the detection of ACT = 1 received from the LT-side and
corresponds to the fully active state.
Wait for ACT
Upon the receipt of AI, the NT waits for a response (ACT = 1) from the LT-side.
Wait for SF
The signal SN2 is sent on the U-interface and the receiver waits for detection of the
superframe.
Wait for SF AL
This state is entered in the case of an analog loop-back and allows the receiver to update
the AGC, to recover the timing phase, and to update the EQ-coefficients.
2.4.10.6 Simplified NT State Machine
As an alternative to the activation/deactivation state machine of the U-transceiver known
from the IEC-Q [9], a more software friendly state machine can be selected.
In the early days of ISDN, the activation and deactivation procedure in a NT was
completely determined by the U- and S-transceiver state machines without a
microcontroller being necessary. Intelligent NTs or U-terminals require a microcontroller
and software. In this case the software controls both the S-and the U-transceiver state
machine.
The simplified U-transceiver state machine was developed to better address the needs
and requirements of software running on the microcontroller. The simplified state
machine offers the following advantages:
– the software can tell whether the IOM -2 clocks are active or powered down via the
– From the received C/I code the software always knows, what it is expected to do and
Data Sheet
received C/I code
what options it has. The software does not have to backtrack older C/I codes.
24.
95
Functional Description
PEF 82912/82913
2001-03-30
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