PEB2256HT datasheet(234/490 Pages) INFINEON

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FALC56 V1.2

PEB 2256

E1 Registers

Data Sheet

234

2002-08-27

Transmit Service Word Pulseframe (Read/Write)

Value after reset: 00

XSIS

Spare Bit For International Use

First bit of the service word. Only significant in doubleframe format. If

not used, this bit should be fixed to "1". If one of the time slot 0

transparent modes is enabled (bit XSP.TT0, or TSWM.TSIS), bit

XSW.XSIS is ignored.

XTM

Transmit Transparent Mode

0 =

Ports SYPX/XMFS define the frame/multiframe begin on the

transmit

system

highway.

The

transmitter

usually

synchronized on this externally sourced frame boundary and

generates the FAS-bits according to this framing. Any change

of the transmit time slot assignment subsequently produces a

change of the FAS-bit positions.

1 =

Disconnects the control of the transmit system interface from

the transmitter. The transmitter is now in a free running mode

without any possibility to actualize the multiframe position. The

framing (FAS-bits) generated by the transmitter is not

“disturbed” (in case of changing the transmit time slot

assignment) by the transmit system highway unless register

XC1 is written. Useful in loop-timed applications. For proper

operation

the

transmit

elastic

buffer

frames,

SIC1.XBS(1:0) = 10) has to be enabled.

XRA

Transmit Remote Alarm

0 =

Normal operation.

1 =

Sends remote alarm towards remote end by setting bit 3 of the

service word. If time slot 0 transparent mode is enabled by bit

XSP.TT0 or TSWM.TRA bit is set, bit XSW.XRA is ignored.

XY(4:0)

Spare Bits For National Use (Y-Bits, Sn-Bits, Sa-Bits)

These bits are inserted in the service word of every other pulseframe

if Sa-bit register access is disabled (FMR1.ENSA = 0). If not used,

they should be fixed to “1”.

If one of the time slot 0 transparent modes is enabled (bit XSP.TT0 or

TSWM.TSA(8:4)), bits XSW.XY(4:0) are ignored.

XSW

XSIS

XTM

XRA

XY0

XY1

XY2

XY3

XY4

(20)

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