PXB4330 Datasheet, PDF (25/201 Pages) Infineon Technologies AG – ICs for Communications

PXB 4330
Overview
1.6
System Integration
The ABM has two operational modes: Bi-directional Mode and Uni-directional Mode. The
directional terminology for the modes refers to the usage of the ABM cores, not to the
connections. The connections are bi-directional in all cases. In Bi-directional Mode, one
ABM core is used exclusively for the cells of a connection in the upstream direction and
the other core exclusively handles cells of the same connection in the downstream
direction. In Uni-directional Mode, only one core always will be used to handle the cells
of a connection both in up- and downstream direction. The two basic applications for
these modes are the switch port (Figure 1-4) and the mini-switch (Figure 1-5),
respectively.
On a switch port, both the upstream and downstream cell flow pass through the same
ABM device. One ABM Core is used for each direction as shown in Figure 1-7.
SSRAM interface
UTOPIA
upstream
receive
MASTER
SDRAM interface
ABM Core
upstream
common
LCI Table
UTOPIA
upstream
transmit
SLAVE
UTOPIA
downstr.
transmit
MASTER
ABM Core
downstream
UTOPIA
downstr.
receive
SLAVE
mP interface
SDRAM interface
JTAG interface
LCI Local Connection Identifier
Figure 1-7 ABM in Bi-directional Mode
The ABM assumes that all connections are setup bi-directionally with the same Local
Connection Identifier (LCI) in both directions. In the Infineon ATM chip set environment
(see Figure 1-4, Figure 1-5 and Figure 1-3), the LCI is provided by the PXB 4350 E
ALP and contains VPI, VCI, and PHY information. If the ABM is not used with the ALP,
it can operate on VPI or VCI identifiers only. In these cases, queuing is done for VCCs
and VPCs, respectively. Also, the AOP could work with full functionality with a header
translation device to provide a connection identifier in the VPI field. In this case, the num-
ber of connections is reduced to 4096 per direction.
In a mini-switch, the throughput is only one times 622 Mbit/s. Only the UTOPIA Rx and
Tx master interfaces are active. Both ABM Cores are selected from the multiplexer
Data Sheet
1-25
09.99