PEF 82912 F V1.4 Infineon Technologies, PEF 82912 F V1.4 Datasheet - Page 93

• Manufacturer Part Number: PEF 82912 F V1.4
• Description: IC MODULAR ISDN NT INTELL TQFP64
• Manufacturer: Infineon Technologies
• Series: Q-SMINT®r

Specifications of PEF 82912 F V1.4

• Function: Second Generation Modular
• Interface: ISDN
• Mounting Type: Surface Mount
• Package / Case: 64-LFTQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Supply: -
• Voltage - Supply: -
• Power (watts): -
• Operating Temperature: -
• Number Of Circuits: -
• Other names: PEF82912FV1.4XT; PEF82912FV14XP; SP000007558; SP000007559

PEF 82912/82913
Functional Description
2.4.6
Cyclic Redundancy Check / FEBE bit
An error monitoring function is implemented covering the 2B + D and M4 data
transmission of a U-superframe by a Cyclic Redundancy Check (CRC).
The computed polynomial is:
12
11
3
2
G (u) = u
+ u
+ u
+ u
+ u + 1
(+ modulo 2 addition)
The check digits (CRC bits CRC1, CRC2, …, CRC12) generated are transmitted in the
U-superframe. The receiver will compute the CRC of the received 2B + D and M4 data
and compare it with the received CRC-bits generated by the transmitter.
A CRC-error will be indicated to both sides of the U-interface, as a NEBE (Near-end
Block Error) on the side where the error is detected, as a FEBE (Far-end Block Error) on
the remote side. The FEBE-bit will be placed in the next available U-superframe
transmitted to the originator.
Figure 44
illustrates the CRC-process.
Data Sheet
79
2001-03-30