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MVTX2601 Scheda tecnica(PDF) 2 Page - Zarlink Semiconductor Inc

Il numero della parte MVTX2601
Spiegazioni elettronici  Unmanaged 24-Port 10/100 Mbps Ethernet Switch
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Produttore elettronici  ZARLINK [Zarlink Semiconductor Inc]
Homepage  http://www.zarlink.com
Logo ZARLINK - Zarlink Semiconductor Inc

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MVTX2601
Data Sheet
2
Zarlink Semiconductor Inc.
QoS Support
Supports IEEE 802.1p/Q Quality of Service with 4 transmission priority queues with delay bounded, strict
priority, and WFQ service disciplines
• Provides 2 levels of dropping precedence with WRED mechanism
• User controls the WRED thresholds
• Buffer management: per class and per port buffer reservations
• Port-based priority: VLAN priority in a tagged frame can be overwritten by the priority of Port VLAN ID
Hardware auto-negotiation through serial management interface (MDIO) for Ethernet ports
Built-in reset logic triggered by system malfunction
•I2C EEPROM for configuration
Description
The MVTX2601 is a high density, low cost, high performance, non-blocking Ethernet switch chip. A single chip
provides 24 ports at 10/100 Mbps, and a CPU interface for managed and unmanaged switch applications.
The chip supports up to 64 K MAC addresses. The centralized shared memory architecture permits a very high
performance packet forwarding rate at up to 3.57 1 M packets per second at full wire speed. The chip is optimized
to provide low-cost, high-performance workgroup switching.
The Frame Buffer Memory domains utilize cost-effective, high-performance synchronous SRAM with aggregate
bandwidth of 6.4 Gbps to support full wire speed on all ports simultaneously.
With delay bounded, strict priority, and/or WFQ transmission scheduling, and WRED dropping schemes, the
MVTX2601 provides powerful QoS functions for various multimedia and mission-critical applications. The chip
provides 4 transmission priorities and two 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 MVTX2601 recognizes a total of 16 UDP/TCP logical ports, 8
hard-wired and 8 programmable (including one programmable range).
The MVTX2601 supports two groups of port trunking/load sharing. Each 10/100 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 MVTX2601 also supports a per-
system option to enable flow control for best effort frames, even on QoS-enabled ports.
The MVTX2601 is fabricated using 0.25 micron technology. Inputs, however, are 3.3 V tolerant, and the outputs are
capable of directly interfacing to LVTTL levels. The MVTX2601 is packaged in a 553-pin Ball Grid Array package.


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