ZL50404
Description
Data Sheet
The ZL50404 is a low density, low cost, high performance, non-blocking Ethernet switch chip. A single chip
provides 4 ports at 10/100 Mbps, 1 uplink port at 10/100 Mbps, and a CPU interface for lightly managed and
unmanaged switch applications. The chip supports up to 4 K MAC addresses and port-based Virtual LANs
(VLANs).
With strict priority and/or WFQ transmission scheduling and WRED dropping schemes, the ZL50404 provides
powerful QoS functions for various multimedia and mission-critical applications. The chip provides 2 transmission
priorities (4 priorities for uplink port) and 2 levels of dropping precedence. Each packet is assigned a transmission
priority and dropping precedence based on the VLAN priority field in a VLAN tagged frame, or the DS/TOS field, or
the UDP/TCP logical port fields in IP packets. The ZL50404 recognizes a total of 16 UDP/TCP logical ports, 8
hard-wired and 8 programmable (including one programmable range).
The ZL50404 provides the ability to monitor a link, detect a simple link failure, and provide notification of the failure
to the CPU. The CPU can then failover that link to an alternate link.
The ZL50404 supports 8 groups of port trunking/load sharing. Each group can contain up to 4 ports. Port
trunking/load sharing can be used to group ports between interlinked switches to increase the effective network
bandwidth.
In half-duplex mode, all ports support backpressure flow control, to minimize the risk of losing data during long
activity bursts. In full-duplex mode, IEEE 802.3x flow control is provided. The ZL50404 also supports a per-system
option to enable flow control for best effort frames, even on QoS-enabled ports.
Statistical information for SNMP and the Remote Monitoring Management Information Base (RMON MIB) are
collected independently for all ports. Access to these statistical counters/registers is provided via the CPU interface.
SNMP Management frames can be received and transmitted via the CPU interface, creating a complete network
management solution.
The ZL50404 is fabricated using 0.18 micron technology. The ZL50404 is packaged in a 208-pin Ball Grid Array
package.
3
Zarlink Semiconductor Inc.
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
