PEB2256HT datasheet(70/490 Pages) INFINEON

70 / 490 page

FALC56 V1.2

PEB 2256

Functional Description E1

Data Sheet

2002-08-27

4.1.12

Framer/Synchronizer (E1)

The following functions are performed:

• Synchronization on pulse frame and multiframe

• Error indication when synchronization is lost. In this case, AIS is sent automatically to

the system side and remote alarm is sent to the remote end if enabled.

• Initiating and controlling of resynchronization after reaching the asynchronous state.

This can be done automatically by the FALC56 or user controlled using the

microprocessor interface.

• Detection of remote alarm indication from the incoming data stream.

• Separation of service bits and data link bits. This information is stored in status

registers.

• Generation of various maskable interrupt statuses of the receiver functions.

• Generation of control signals to synchronize the CRC checker, and the receive elastic

buffer.

If programmed and applicable to the selected multiframe format, CRC checking of the

incoming data stream is done by generating check bits for a CRC submultiframe

according to the CRC4 procedure (refer to ITU-T G.704). These bits are compared with

those check bits that are received during the next CRC submultiframe. If there is at least

one mismatch, the CRC error counter (16 bit) is incremented.

4.1.13

Receive Elastic Buffer (E1)

The received bit stream is stored in the receive elastic buffer. The memory is organized

as a two-frame elastic buffer with a maximum size of 64

× 8 bit. The size of the elastic

buffer can be configured independently for the receive and transmit direction.

Programming of the receive buffer size is done by SIC1.RBS1/0:

• RBS1/0 = 00: two frame buffer or 512 bits

Maximum of wander amplitude (peak-to-peak): 190 UI (1 UI = 488 ns)

average delay after performing a slip: 1 frame or 256 bits

• RBS1/0 = 01: one frame buffer or 256 bits

Maximum of wander amplitude: 100 UI

average delay after performing a slip: 128 bits, (SYPR = output)

• RBS1/0 = 10: short buffer or 96 bits

Maximum of wander amplitude: 38 UI

average delay after performing a slip: 48 bits, (SYPR = output)

• RBS1/0 = 11: Bypass of the receive elastic buffer

The functions are:

• Clock adaption between system clock (SCLKR) and internally generated route clock

(RCLK).

• Compensation of input wander and jitter.

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