PEB2256HT datasheet(413/490 Pages) INFINEON

413 / 490 page

FALC56 V1.2

PEB 2256

T1/J1 Registers

Data Sheet

413

2002-08-27

Framer Receive Status Register 1 (Read)

EXZD

Excessive Zeros Detected

Significant

only

excessive

zeros

detection

enabled

(FMR2.EXZE = 1).

Set after detecting of more than 7 (B8ZS code) or more than 15 (AMI

code) contiguous zeros in the received bit stream. This bit is cleared

on read.

PDEN

Pulse-Density Violation Detected

The pulse-density of the received data stream is below the

requirement defined by ANSI T1. 403 or more than 14 consecutive

zeros are detected. With the violation of the pulse-density this bit is

set and remains active until the pulse-density requirement is fulfilled

for 23 consecutive "1"-pulses.

Additionally an interrupt status ISR0.PDEN is generated with the

rising edge of PDEN.

LLBDD

Line Loop-Back Deactivation Signal Detected

This bit is set in case of the LLB deactivate signal is detected and then

received over a period of more than 33,16 ms with a bit error rate less

than 10

-2. The bit remains set as long as the bit error rate does not

exceed 10

-2.

If framing is aligned, the first bit position of any frame is not taken into

account for the error rate calculation.

Any change of this bit causes an LLBSC interrupt.

LLBAD

Line Loop-Back Activation Signal Detected/PRBS Status

Depending on bit LCR1.EPRM the source of this status bit changed.

LCR1.EPRM = 0: This bit is set in case of the LLB activate signal is

detected and then received over a period of more than 33,16 ms with

a bit error rate less than 10

-2. The bit remains set as long as the bit

error rate does not exceed 10

-2.

If framing is aligned, the first bit position of any frame is not taken into

account for the error rate calculation.

Any change of this bit causes an LLBSC interrupt.

FRS1

EXZD

PDEN

LLBDD

LLBAD

XLS

XLO

(4D)

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