pxf4336 Infineon Technologies Corporation, pxf4336 Datasheet - Page 112

• Manufacturer Part Number: pxf4336
• Description: Abm Premium Atm Buf Fer Manager
• Manufacturer: Infineon Technologies Corporation

3.5.2.2.1 RM_Cell_received
For each incoming RM cell (FRM and BRM), a message is generated containing the
QID, the cell header and the first 24 octets of the RM cell payload. The message is stored
in the RM FIFO. The structure of this message is shown in
After reading a message from the RM FIFO, the IOP handles the following cases:
• In ABR-VS/VD mode, the FRM cells are stored and updates of the destination
• In ABR-ER mode, the CI/NI and ER fields are evaluated to calculate the ACR.
3.5.2.2.2 Emit
For each cell emission event from an ABR queue, the ABM-P core generates an Emit
message with the QID, the current queue length Qlen and the current time Tnow as
parameters. The message is stored in the Emit FIFO. The structure of this message is
shown in
After reading a message from the Emit FIFO, the IOP handles the following cases:
• In ABR-VS/VD mode RM_Cell_insert messages and/or Rate_update messages are
• In ABR-ER and RSC mode Rate_update messages are generated.
In addition to cell emission events, the Emit FIFO also contains time-out events
generated and forwarded by the Scan Unit (see
3.5.2.2.3 Rate_Update_ABR
In Reactive Switch Control mode (see
rate shaping parameter TP (RateFactor) of the PCR Limiter to the ABM-P core. The
delivered value is immediately stored and used by the next schedule event on the
respective queue.
In ABR-VS/VD mode, the virtual source receives the current rate shaping parameter TP
(Rate Factor) of the PCR Limiter from the ERC unit.
3.5.2.2.4 RM_Cell_Insert
In case of VS/VD, this message is sent by the ERC unit to inform the ABM-P core that
an in-rate RM cell needs to be inserted instead of the planned user cell. The RM cell itself
is generated within the ABM-P core. All variable values of the RM cell are delivered by
the ERC unit, all other fields have fixed values. The user cell (at least one) inside the
queue is scheduled next. But, it can happen that an RM cell is inserted before.
Data Sheet
turnaround function are performed. An RM_Cell_Insert message is generated in
response. For the BRM cells, the CI/NI and ER fields are evaluated to calculate the
ACR.
generated.
Section
3.6.10.2.
Section
112
3.5.1.8), the ERC unit sends the current
Section
3.5.2.5)
Section
Functional Description
3.6.10.1.
PXF 4336 V1.1
2001-12-17
ABM-P