RELEASED
PM73123 AAL1GATOR-8
DATASHEET
PMC-2000097
ISSUE 2
8 LINK CES/DBCES AAL1 SAR
Field (Bits)
Description
R_MAX_BUF
(8:0)
Receiver maximum buffer size. The R_MAX_BUF is
coded as the number of frames. In all structured
modes, this is the number of frames. In all
unstructured modes, this is the number of 256-bit
increments. If the amount of data in the receive
buffer exceeds R_MAX_BUF, no more data will be
written, an overflow will be reported, and the queue
will be forced into underrun. The maximum value of
R_MAX_BUF is 1FEh for most cases. For T1
structured mode or E1 with T1 signaling, the
maximum value is 17Eh because not all frames are
used.
The value of R_MAX_BUF should be equal to or
greater than two times R_CDVT, or R_CDVT plus
two times the number of frames required per cell,
whichever is greater. If MF_ALIGN_EN is set in
LIN_STR_MODE, then extra margin should be
added for the additional multi-frame of data that
may be present. Therefore, the value should be
increased by 16 frames for E1 or 24 frames for T1.
Also if DBCES is being used then 48 frames should
be added to account for the DBCES buffer
adjustment.
R_SEQUENCE ERROR Word Format (05H)
This word is read-only and is maintained by the RALP
Field (Bits)
Description
R_SEQUENCE_ERR
(15:0)
16-bit rollover count of SN errors. This counter
counts transitions from the SYNC state to the
OUT_OF_SEQUENCE state. This is the
atmfCESAal1SeqErrors count from the CES
specification.
Note that if SN processing is disabled, this counter
will count all out-of-sequence cells. Initialize to 0.
Once initialized, do not write to this word.
PMC-SIERRA, INC. PROPRIETARY AND CONFIDENTIAL
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PMC [ PMC-SIERRA, INC ]
