PXF4336 Datasheet, PDF (63/425 Pages) Infineon Technologies AG – ABM Premium ATM Buf fer Manager

ABM-P
PXF 4336 V1.1
Functional Description
VPI/VCI₁
Phy 1
Phy 2
LCI₁
HT
LCI₂
ALP
PXB
4350
LCI₁
HT
LCI₂
AOP
PXB
4340
LCI₁
LCI₂
LCI₁
LCI₂
ABM-P (uni-directional mode)
Cores
LCI=
LCI+/-1
VPI/VCI₂
HT = Header Translation
LCI = Local Connection Identifier
Figure 3-13 Connection Identifiers in Mini-Switch Configuration
For minimum complexity, the header translation of the ABM-P is done by inverting the
Least Significant Bit (LSB) of the LCI. This measure divides the available LCI range into
two parts: odd LCI values for forward connections and even LCI values for backward
connections (or vice-versa). That is, it reduces the available number of connection iden-
tifiers to 8192, because two LCI values are used per connection.
This is not a restriction in the case of arbitrary address reduction modes as, for example,
when the ALP chip is used with the CAME chip (PXB 4360), as ATM connections are
always set up bi-directionally with the same VPI/VCI in both directions of a link.
Refer to Register 126 "MODE1" on Page 373 for the configuration of the bi-directional
and uni-directional mode, the enabling of the LCI toggling, as well as the deactivation of
the downstream core.
Note: In case of fixed address reduction, as, for example, when using the ALP with the
built-in Address Reduction Circuit (ARC), the usable LCI range may be seriously
restricted, depending on the PHY configuration.
Data Sheet
63
2001-12-17