PXB4330 Datasheet, PDF (26/201 Pages) Infineon Technologies AG – ICs for Communications

PXB 4330
Overview
options shown in Figure 1-8. Each cell is forwarded to both ABM Cores; but, the LCI
table entry for the connection determines which of the 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. The schedulers must
be programmed such that the sum of all output rates does not exceed the maximum rate
supported by the UTOPIA transmit interface.
SSRAM interface
UTOPIA
upstream
receive
MASTER
SDRAM interface
ABM Core
upstream
common
LCI Table
UTOPIA
upstream
transmit
SLAVE
UTOPIA
downstr.
transmit
MASTER
mP interface
ABM Core
downstream
SDRAM interface
UTOPIA
downstr.
receive
SLAVE
JTAG interface
Figure 1-8 ABM in Uni-directional Mode Using both Cores
If the resources of one Core are sufficient, the downstream Core can be deactivated (see
Figure 1-9). This reduces the power consumption and allows omission of the external
downstream SDRAM. It also permits the SSRAM to be smaller (see below).
Data Sheet
1-26
09.99