PM73121ꢀAAL1gator II
Data Sheet
PMC-Sierra, Inc.
PMC-980620
,VVXHꢀꢁ
AAL1 SAR Processor
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Provides a 256-cell OAM receive queue.
Provides processor interrupt for OAM cell reception.
Provides a 0 to 31 sample SRTS CDVT setting.
Supports SRTS by collecting and queueing SRTS values, calculating a local SRTS value
derived from the local transmit clock and the local network reference clock, and driving
the difference between the incoming value and the local value out of a multiplexed
interface. This difference can then be used to drive eight external digital or analog PLLs.
Application support is available for an 8-line SRTS/adaptive digital frequency
synthesizer, which can be added externally. Clock synthesis logic, internal to the chip, can
optionally be configured to synthesize the TL_CLK based on the received SRTS values.
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In all modes except UDF-HS, supports adaptive clocking by calculating the receive frame
difference and providing it to the external adaptive digital frequency synthesizer.
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Provides a 2-cell UTOPIA FIFO.
Defines receive delay primarily by the following two components: buffering to handle
CDV and the internal cell processing time. The internal cell processing time is less than 20
µs.
2.5 Statistics
The AAL1gator II gathers statistical information on all transmitted and received cells. These sta-
tistics are maintained in 16-bit counters (which are implemented as rollover counters and are
never cleared) in the external memory. Table 2 lists the provided statistics counters.
Table 2. Statistics Counters
Number of
Counters
Counter Name
R_OAM_CELL_CNT
Counter Description
1
1
Count of OAM cells received.
R_DROPPED_OAM_CELL_CNT
Count of OAM cells received and dropped due to lack of space in the
receive OAM FIFO.
R_INCORRECT_SNP
256
256
Count of number of occurrences when the SN CRC and/or parity
was not correct. Both correctable and noncorrectable errors are
reported.
R_SEQUENCE_ERR
Count of SN errors. Counts transitions from SYNC to OUT_OF_
SEQUENCE.
R_CELL_CNT
256
256
256
Count of billable data cells received from the UTOPIA interface.
Count of cells that were received but dropped.
R_DROPPED_CELLS
R_UNDERRUNS
Count of the number of underruns on this queue to account for lost
cells.
R_LOST_CELLS
R_OVERRUNS
256
256
Count of cells detected lost for this queue.
Count of overruns on this queue.
ꢀꢈ
PMC [ PMC-SIERRA, INC ]
