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PEB2035-N

Advanced CMOS Frame Aligner ACFA

Siemens AG 

PEB 2035

1.3 Pin Definitions and Functions (cont’d)

P-LCC

Pin No.

40

P-DIP Symbol

Pin No.

36

XSIGM /

XREQ

Input (I)

Output (O)

O

Function

Transmit Signaling Marker

Its function is equivalent to RSIGM for the data

stream at ports XDI and XSIG (XSIG: PCM 24

mode only).

Transmit Request

Its function is equivalent to RREQ for writing data

to the stack XSIG.

In dependance of bit EMOD.EDMA signal XREQ

will be cleared

– EDMA = 0: at the end of the first write access to

stack XSIG (rising edge of WRQ);

– EDMA = 1: with the beginning of the second

(PCM 30) or third (PCM 24) write access to

stack XSIG.XREQ is reset with the falling edge

of ACKNLQ or CEQ and remains reset if a write

cycle to stack XSIG follows. Otherwise, it

becomes active again until the second or third

access to XSIG is provided.

Semiconductor Group

18

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