PRELIMINARY
MX98217EC
16-port Dual-Speed Ethernet Switch Controller
FEATURES
z IEEE 802.1q CoS and two priority queues support
based on port, tagging, and TOS configurations
z Address table and PHY register access allowed
through CPU processor
z Single chip 16-port 10/100M wire speed Ethernet
switching controller with all memory embedded
z Integration of 16-port dual speed, full/half duplex
capable Media Access Controllers (MACs) with RMII
interfaces
z Support IEEE 802.3x compliant flow control for FDX
and back-pressure flow control for HDX
z Auto-negotiation through MDC/MDIO
z Support source/destination MAC address lookup and
aging within built-in storage of 4K MAC address (2K
entries each entry table)
z Dynamic buffer management
z No head-of-line blocking system support
z Power on self diagnostic
z Serial EEPROM (93C46) interface for auto-
configuration
z Broadcast storm prevention
z Serial CPU interface support for system configuration
required
z One trunk group that supports 800M bandwidth
z CMOS/LVTTL, 2.5V/3.3V IO Tolerance
z 128 PQFP package
z Self address learning, forwarding, and filtering
schemes
z Store-and-Forward switching operation
z Support 16 x 16 bit matrix for port base VLAN
GENERAL DESCRIPTION
MX98217EC is a stand-alone 10/100M Ethernet switch
controller with SRAM embedded which saves 2-3 extra
64K x 64 SRAM cost. Any standalone desktop or
enterprising Ethernet switches can be achieved by
simply combining MX98217EC and quad/octal physical
devices. All 16 ports are full duplex capable to provide
dedicated 20/200M bandwidth connections each port.
MX98217EC basically supports store-and-forward
switching scheme with a 4K-address entry table. The
function modules integrated in controller include 16-port
half/full-duplex compatible media access controller with
RMII interface, address resolution logic (ARL) for
address learning, filtering, recognition, priority queue
manager, port base VLAN. It fully complies with IEEE
Std. 802.3/802.3u/802.1q specifications and supports
MDC/MDIO interface for physical layer management
with industrial standard physical devices.
Now, Voice over IP (VoIP) is applied the feature for
cutting voice packet latency and promise the quality of
service.
In addition, port-base VLAN is another
valuable feature for the switches. MX98217EC offers
16 groups with port overlapping allowed. The feature
can add on more security and data flow in the same
switch with different groups should get connection
through router. The powerful switching architecture
and robust design can easily reach high performance,
non-blocking data flow.
Head-of-line blocking prevents switch performance, and
operation defective from other port impacts. The switch
architecture provides
a
clean port independent
operation. It guarantees port transmission or receive
is not affected by other ports.
Moreover, user can discard broadcast packets regarding
the threshold of system overload.
This prevents
The switch architecture adopting dynamic buffer
management shared by 16 ports can reach full-line
potential broadcast storming from abnormal events.
After buffer fullness drops in the safe margin, the switch
controller jumps into flow control state to allow physical
ports work as normal condition.
speed of high performance application.
To save
system cost, single 50Mhz clock is for RMII and system
requirement. MX98217EC proceeds in advanced
foundry and smaller package which consumes lower
power dissipation.
MX98217EC provides one trunk group with four physical
links that contribute up to 800M bandwidth. The DA/SA
load balance algorithm is applied to these trunk ports to
ensure link quality.
The smart features with low power CPU or EEPROM
are for system configuration and ALR access (port and
MAC address freezing/locking function for security
server functionality) required. Also, it extracts various
packet types in appropriate forwarding scheme.
At last, MX98217EC has the self-diagnostic ability that
enables it to check the embedded memories during
reset and display it onto LED if any error happens.
P/N:PM0781
REV. 0.1, Dec, 12, 2002
Confidential
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