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Intel
®
IXP42X product line and IXC1100 control plane processors—UTOPIA Level-2
Intel
®
IXP42X Product Line of Network Processors and IXC1100 Control Plane Processor
DM September 2006
538 Order Number: 252480-006US
19.0 UTOPIA Level-2
The functionality supported by the UTOPIA Level-2 interface is tightly coupled with the
code written on the Network Processor Engine (NPE). This chapter details the full
hardware capabilities of the UTOPIA-2 interface contained within the UTOPIA Level-2
coprocessor of the Intel
®
IXP42X Product Line of Network Processors and IXC1100
Control Plane Processor. The features accessible by the user are described in the Intel
®
IXP400 Software Programmer’s Guide and may be a subset of the features described in
this chapter.
Not all of the Intel
®
IXP42X product line and IXC1100 control plane processors have
this functionality. See Table 173.
The UTOPIA Level-2 is an industry-standard interface that is used to provide connection
between Asynchronous Transmission Mode (ATM) and physical layer (PHY) of an ATM
network. The UTOPIA-2 coprocessor is the entity, within the IXP42X product line and
IXC1100 control plane processors, that provides the UTOPIA Level-2 interface.
The UTOPIA Level-2 coprocessor, implemented on the IXP42X product line and IXC1100
control plane processors, provides an 8-bit, UTOPIA Level-2 interface operating at
speeds of up to 33 MHz. The UTOPIA Level-2 interface can be configured to operate in
a single-PHY (SPHY) or a multiple-PHY (MPHY) environment.
The interface contains five transmit and five receive address lines for multi-PHY
selection. The UTOPIA Level-2 coprocessor is comprised of three functional modules:
• UTOPIA Transmit Module
• UTOPIA Receive Module
• Network Processor Engine (NPE) Core Interface Module
Two 128-byte-deep FIFOs are contained in each direction of data flow — one FIFO for
transmit and one FIFO for receive. Each FIFO is organized into two cell buffers, each
being 64 bytes deep. This FIFO arrangement allows the receive module to be
processing a cell and storing it away at the same time the Network Processor Engine
core is processing a previously received cell.
In the transmit direction, the Network Processor Engine core can be placing a cell into
one transmit buffer while the Transmit Module is removing the cell from the other
transmit buffer.
Table 173. Processors’ Devices with UTOPIA
Intel
®
IXP425
Network
Processor
B Step
Intel
®
IXP423
Network
Processor
Intel
®
IXP422
Network
Processor
Intel
®
IXP421
Network
Processor
Intel
®
IXP420
Network
Processor
Intel
®
IXC1100
Control
Plane
Processor
UTOPIA
Level-2
XX X