PXF4336 Datasheet, PDF (61/425 Pages) Infineon Technologies AG – ABM Premium ATM Buf fer Manager

ABM-P
PXF 4336 V1.1
Functional Description
two cores accepts the cell. The other core ignores it. Thus, each cell is stored and
queued in one of the two cores. The cell streams of both cores are multiplexed together
at the output. In normal operation, the schedulers are programmed such that the sum of
all output rates does not exceed the maximum rate supported by the UTOPIA transmit
interface. However, bandwidth overbooking of the interface is also possible, resulting in
backpressure towards the respective ABM-P core.
•
SSRAM interface
SDRAM interface
UTOPIA
upstream
receive
MASTER
ABM-P Core
upstream
UTOPIA
upstream
transmit
SLAVE
Common
LCI Table
UTOPIA
downstr.
transmit
MASTER
µP interface
ABM-P Core
downstream
SDRAM interface
UTOPIA
downstr.
receive
SLAVE
JTAG interface
Figure 3-11 ABM-P in Uni-directional Mode Using both Cores
If the resources of one core are sufficient, the downstream core can be deactivated (see
Figure 3-12). This reduces power consumption and allows omission of the external
downstream SDRAM. It also permits the SSRAM to be smaller (see below).
Data Sheet
61
2001-12-17