PEB2256HT datasheet(93/490 Pages) INFINEON

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FALC56 V1.2

PEB 2256

Functional Description E1

Data Sheet

2002-08-27

The FALC56 also offers the ability to generate and detect a flexible in-band loop-up and

loop-down pattern (LCR1.LLBP = 1). The loop-up and loop-down pattern is individually

programmable from 2 to 8 bits in length (LCR1.LAC1/0 and LCR1.LDC1/0).

Programming of loop codes is done in registers LCR2 and LCR3.

Status and interrupt status bits inform the user whether loop-up or loop-down code has

been detected.

4.3.7

Time Slot 0 Transparent Mode

The transparent modes are useful for loop-backs or for routing data unchanged through

the FALC56.

In receive direction, transparency for ternary or dual-/single-rail unipolar data is always

achieved if the receiver is in the synchronous state. In asynchronous state data is

transparently switched through if bit FMR2.DAIS is set. However, correct time slot

assignment cannot be guaranteed due to missing frame alignment between line and

system side.

Setting of bit LOOP.RTM disconnects control of the internal elastic store from the

receiver. The elastic buffer is now in a “free running” mode without any possibility to

update the time slot assignment to a new frame position in case of resynchronization of

the receiver. Together with FMR2.DAIS this function can be used to realize undisturbed

transparent reception.

Transparency in transmit direction can be achieved by activating the time slot 0

transparent mode (bit XSP.TT0 or TSWM.(7:0)). If XSP.TT0 = 1 all internal information

of the FALC56 (framing, CRC, S

a/Si-bit signaling, remote alarm) is ignored. With register

TSWM the S

i-bits, A-bit or the Sa-bits can be enabled selectively to send data

transparently from port XDI to the far end. For complete transparency the internal

signaling controller, idle code generation and AIS alarm generation, single channel and

payload loop-back have to be disabled.

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