RELEASED
PM73123 AAL1GATOR-8
DATASHEET
PMC-2000097
ISSUE 2
8 LINK CES/DBCES AAL1 SAR
set. No new entries for sticky bits will be made into the RCVN_STAT_FIFO for
this queue until the sticky bit register is cleared.
9.2.2.2.12
OAM Cells
When an OAM cell arrives, the RALP stores it in the OAM queue. The RALP
notifies the microprocessor of the arrival of OAM cells by setting the OAM_INTR
bit in the A1SP_INTR_REG. The microprocessor reads the OAM cells from the
OAM queue. The microprocessor maintains the OAM_HEAD value. The RALP
maintains the OAM_TAIL value. The AAL1gator-8 also checks the CRC-10 of the
cell and records the results in the receive buffer in the CRC_10_PASS
parameter.
9.2.2.2.13
OAM Cell Interrupt Handling
The AAL1gator-8 has the capability to generate an interrupt on the receipt of an
OAM cell.
At the end of an OAM cell, the RALP sets the OAM_INTR bit in the
A1SP_INTR_REG. If the OAM_INTR bit is enabled, the A1SP interrupt bit will be
set in the MSTR_INTR_REG which will generate an interrupt if enabled.
9.2.2.3 Receive Frame Transfer Controller (RFTC)
The RFTC moves data bytes from the receive frame buffer to the appropriate
timeslot of the appropriate line. It must perform a timeslot-to-queue translation
for each timeslot by reading the receive channel-to-queue table. The RFTC
outputs data to the Line Interface Block. For structured data, the RFTC uses the
frame pulses generated by the Line Interface Block or internally generated frame
pulses to perform a parallel-to-serial conversion on the outgoing data that it
reads from a multiframe buffer in the order in which it is needed
A rising edge on the appropriate frame pulse indicates the beginning of a frame
or multiframe. The RFTC realigns when a rising edge is seen on these signals. It
is not necessary to provide an edge every frame or multiframe. Signaling data is
driven for all frames of any multiframe and will change only on multiframe
boundaries. Signaling will not change when the queue is in underrun, or if a
DBCES channel is not active. This is called frozen signaling. The RFTC also
has the option of playing out conditioned signaling.
For T1 mode, signaling data may change every 24th frame. For E1 mode,
signaling may change every 16th frame. The RFTC accommodates the T1 Super
Frame (SF) mode by treating it like the Extended Super Frame mode( ESF)
format. The RFTC generally ignores the multiframe pulses that occur on the 12th
frame in the multiframe.
PMC-SIERRA, INC. PROPRIETARY AND CONFIDENTIAL
133
PMC [ PMC-SIERRA, INC ]
