RELEASED
PM73123 AAL1GATOR-8
DATASHEET
PMC-2000097
ISSUE 2
8 LINK CES/DBCES AAL1 SAR
Base address within A1SP: 8800h
Index: 100h
Type: Read/Write
Function: The receive signaling queue stores the SRTS bits received from the
UTOPIA interface.
Initialization: It is not necessary to initialize this structure.
Format: One SRTS nibble per word.
R_SRTS_QUEUE_n Word Format
Field (Bits)
Description
Not used
(15:8)
Write with a 0 to maintain future software
compatibility.
R_SRTS_VAL
(7:4)
Indicates if each SRTS bit contains valid data.
When an error occurs which causes a bit to be lost
the corresponding bit will be written with a 0. Each
time a new entry is written, the remaining bits which
haven’t been received yet will also be written with a
0. So normally this field will be written with a “1000”
for the first bit then “1100” for the second bit, then
“1110” for the third bit and finally “1111” for the last
bit.
R_SRTS
(3:0)
Receive SRTS data for line = offset / 64.
10.4.10
RESERVED (Receive Signaling Buffer)
This structure is reserved. Software modifications to this structure after setup will
cause incorrect operation.
Organization: 32 x 32 DS0s x 8 lines. Each line is allocated a separate 32 x 32
byte memory. For E1, this allows storage of signaling information for 32
multiframes, unless E1_WITH_T1_SIG is set. T1 applications use only the first
24 bytes of every 32 to store signaling data. In addition, since the receive data
buffer is only 16 multiframes in size, this structure also needs to store only 16
multiframes. Successive multiframes are stored in every other 32-byte buffer.
When signaling is frozen due to an underrun, the value in multiframe 0 is used.
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