pxf4336 Infineon Technologies Corporation, pxf4336 Datasheet - Page 60

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

3.3
The ABM-P has two operational modes: Bi-directional mode and Uni-directional mode.
The directional terminology for the modes refers to the usage of the ABM-P cores, not to
the connections. The connections are bi-directional in all cases. In Bi-directional mode,
one ABM-P 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 line card application and the mini-
switch, respectively.
On a typical switch port line card, both the upstream and downstream cell flow pass
through the same ABM-P device. One ABM-P core is used for each direction as shown
in
•
Figure 3-10 ABM-P in Bi-directional Mode
The ABM-P assumes that all connections are set up bi-directionally with the same Local
Connection Identifier (LCI) in both directions. In the Infineon ATM chip set environment,
the LCI is provided by the PXB 4350 E ALP and contains VPI, VCI, and PHY information.
If the ABM-P is not used with the ALP, it can extract the LCI from VPI or VCI fields or
generate the LCI by using the internal Address Reduction Circuit (ARC).
In a mini-switch application, the total throughput at 51.84 MHz is 687 Mbit/s. Only the
UTOPIA Receive and Transmit interfaces at the PHY-side are active. Both ABM-P cores
are selected from the multiplexer options shown in
to both ABM-P cores and the LCI table entry for the connection determines which of the
Data Sheet
Figure
3-10.
upstream
MASTER
MASTER
UTOPIA
UTOPIA
downstr.
transmit
System Integration
receive
SSRAM interface
µP interface
LCI Table
Common
SDRAM interface
SDRAM interface
ABM-P Core
ABM-P Core
downstream
upstream
60
Figure
3-11. Each cell is forwarded
JTAG interface
Functional Description
upstream
UTOPIA
UTOPIA
downstr.
transmit
PXF 4336 V1.1
receive
SLAVE
SLAVE
2001-12-17
ABM-P