PEB2035-N Ver la hoja de datos (PDF) - Siemens AG
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PEB2035-N Datasheet PDF : 134 Pages
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PEB 2035
1.3 Pin Definitions and Functions (cont’d)
P-LCC
Pin No.
39
P-DIP Symbol
Pin No.
35
RSIGM /
RREQ
Input (I)
Output (O)
O
Function
Receive Signaling Marker
– PCM 30: Marks time-slot 16 of every received
frame at port RDO.
– PCM 24: When using CCS or CAS-CC
signaling schemes (bit MODE.SIGM = 0)
RSIGM marks
a) Time-slot 31 (speech channel 24) in channel
translation mode 0 (bit MODE.CTM = 0)
b) Time-slot 23 (speech channel 24) in channel
translation mode 1. Setting bit FMR.SM24
shifts the marker to time-slot 16 (speech
channel 17).
When using the CAS-BR signaling scheme, the
robbed bit of each channel every six frames is
marked.
Receive Request
If access to the internal signaling stacks RSIG and
XSIG is enabled via bit XC0.ISIG, this port acts as
a DMA or interrupt request. It requires the
controller to read the stack RSIG.RREQ will be
held active until the first read access to RSIG is
finished. It will be generated
– PCM 30: once a doubleframe
– PCM 24: every three frames in CCS/CAS-CC
mode, or
once a signaling frame (every six frames) at CAS-
BR mode. In dependance of bit EMOD.EDMA
signal RREQ will be cleared
– EDMA = 0: at the end of the first read access to
stack RSIG (rising edge of RDQ);
– EDMA = 1: with the beginning of the second
(PCM 30) or third (PCM 24) read access to
stack RSIG (falling edge of RDQ).
Semiconductor Group
17
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