IP1726 LF
Preliminary Data Sheet
1/33
Jun 15, 2005
Copyright © 2003, IC Plus Corp.
IP1726 LF-DS-R06
26-port 10/100M Smart Switch Controller
Features
General Description
Embeds 1.5 Mb packet buffer
Handles up to 4K MAC address entries
Supports non-blocking wire speed operation
Provides 24-port SS-SMII and 2-port MII
Supports 2 ports selectable normal MII,
reverse MII
All I/O signals can operate at 3.3V or 1.8V.
Supports up to 26 port based VLAN group
Supports 256 levels of data rate control
Captures BPDU, IGMP and OSPF …packet
and forward to the 26th port.
Suppress/enable per port address learning.
Embeds two levels of priority queues for VLAN
tag,
physical
port
and
IP
Differentiated
Service.
Supports flexible port trunking configuration:
up to 3 groups and up to 4 ports for each
group
Embeds an internal regulator controller to
simplify the system design.
Power supply: 1.8V for core logic; optional
3.3V or 1.8V for I/O.
128 pin QFP package
Adjustable I/O driving capability
Support packet length up to 1536 Bytes
Spanning Tree state support.
Supports 3 kinds of port mirrioring methods
HOL blocking prevention
Only one 25MHz crystal needed
Broadcast storm control support
Programmable MAC address table through 2
serial pins.
Support Lead Free package (Please refer to
the Order Information)
Supporting 24-port SS-SMII, 2-port MII and
various advanced features, the IP1726 LF fits both
the office switch and the ETTH( Ethernet to the
Home) application. The IP1726 LF embeds
internal SSRAM for the use of the packet buffer
and
the
MAC
address
table.
Besides
the
traditional
switch
functions,
the
IP1726
LF
provides the easy-to-design solution, fitting the
requirement of most switch application.
The IP1726 LF also supports some features which
can simplify the customer’s design from the
viewpoint of the system. The embedded regulator
controller can reduce the component number on
the system board. The web management can be
easily accomplished by adding an external CPU
with protocol stack. All the I/O pins can operate at
3.3V or 1.8V, providing more design flexibility for
power supply distribution.
The IP1726 LF embeds 1.5Mb internal packet
buffer and stores up to 4K MAC address entries,
making
it
suitable
for
the
generic
switch
application. In addition, the IP1726 LF supports a
wide range of data rate for both egress and
ingress, which is useful in the ETTH(Ethernet to
the Home) application. The higher layer data
packet such as BPDU, IGMP, OSPF can be
forwarded to either the 25
th or 26th (CPU) port. The
flexible trunk configuration allows the user to scale
the switch interconnection bandwidth. When the
port mirroring function is enabled, the data traffic
on the source port will be forwarded to a specified
destination port, making the switch administration
easier. Supporting up to 26 port based VLAN
groups, the IP1726 LF can be configured to fit
various traffic partitions. The CoS function is
accomplished by configuring the priority of the
physical port, the 802.1Q VLAN tag and IP
DSCP(Differentiated Service Code Point). In order
to fit the application of some special environment,
the address learning and the MAC address table
aging can be disabled.
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