RELEASED
PM73123 AAL1GATOR-8
DATASHEET
PMC-2000097
ISSUE 2
8 LINK CES/DBCES AAL1 SAR
Figure 48 shows the contents of the receive signaling buffer with an E1 line in
the SDF-MF mode with T1 signaling. Even channel bytes are stored in the low-
byte end of the data words.
Figure 48 E1 SDF-MF with T1 Signaling Format of the R_SIG_BUFFER
Byte Address
Multiframe
C han nel 30 Channel 31
ABCD ABCD
Chan nel 0
ABCD
C hannel 1
ABCD
0
15
9.2.2.2.6 Handling Data and Signaling Bytes in a Structure
A data structure consists of all of the data bytes for that structure, followed by all
of the signaling bytes for that structure, if any. In order to locate the data and
signaling bytes, the following memory structures are used:
• The R_TOT_SIZE structure provides the number of data and signaling bytes
in a structure. An element can be a data byte or a signaling nibble. This value
is initialized by the microprocessor.
• The R_TOT_LEFT structure provides the running count of the number of
bytes remaining in the structure.
• The R_DATA_LAST structure identifies the last byte of the data structure. As
the data bytes are stored in memory, the R_TOT_LEFT structure is
decremented by one. When R_TOT_LEFT is equal to R_DATA_LAST, it
indicates the end of the data structure. The remaining bytes are stored in the
R_SIG_QUEUE. The signaling nibbles are written to the memory until the
R_TOT_LEFT equals zero. Once R_TOT_LEFT is zero, R_TOT_SIZE is
copied to R_TOT_LEFT and the storing of data and signaling structures is
repeated. R_TOT_SIZE and R_DAT_LAST are initialized by the
microprocessor.
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