KSZ9897R
7-Port Gigabit Ethernet Switch
with Two RGMII/MII/RMII Interfaces
• Five Integrated PHY Ports
Highlights
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1000BASE-T/100BASE-TX/10BASE-Te IEEE 802.3
• Non-blocking wire-speed Ethernet switching fabric
• Full-featured forwarding and filtering control, includ-
ing Access Control List (ACL) filtering
• Full VLAN and QoS support
Fast Link-up option significantly reduces link-up time
Auto-negotiation and Auto-MDI/MDI-X support
On-chip termination resistors and internal biasing for
differential pairs to reduce power
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LinkMD® cable diagnostic capabilities for determining
cable opens, shorts, and length
• Five ports with integrated 10/100/1000BASE-T PHY
transceivers
• Two Configurable External MAC Ports
• Two ports with 10/100/1000 Ethernet MACs and con-
figurable RGMII/MII/RMII interfaces
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Reduced Gigabit Media Independent Interface
(RGMII) v2.0
• IEEE 802.1X access control support
• EtherGreen™ power management features,
including low power standby
Reduced Media Independent Interface (RMII) v1.2
with 50MHz reference clock input/output option
Media Independent Interface (MII) in PHY/MAC mode
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• Flexible management interface options: SPI, I C,
• Advanced Switch Capabilities
MIIM, and in-band management via any port
• Commercial/Industrial temperature range support
• 128-pin TQFP-EP (14 x 14mm) RoHS compliant pkg
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IEEE 802.1Q VLAN support for 128 active VLAN
groups and the full range of 4096 VLAN IDs
IEEE 802.1p/Q tag insertion/removal on per port basis
VLAN ID on per port or VLAN basis
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IEEE 802.3x full-duplex flow control and half-duplex
back pressure collision control
Target Applications
• Stand-alone 10/100/1000Mbps Ethernet switches
• VoIP infrastructure switches
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IEEE 802.1X access control
(Port-based and MAC address based)
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IGMP v1/v2/v3 snooping for multicast packet filtering
IPv6 multicast listener discovery (MLD) snooping
IPv4/IPv6 QoS support, QoS/CoS packet prioritization
802.1p QoS packet classification with 4 priority queues
Programmable rate limiting at ingress/egress ports
Broadcast storm protection
• Broadband gateways/firewalls
• Wi-Fi access points
• Integrated DSL/cable modems
• Security/surveillance systems
• Industrial control/automation switches
• Networked measurement and control systems
Four priority queues with dynamic packet mapping for
IEEE 802.1p, IPv4 DIFFSERV, IPv6 Traffic Class
MAC filtering function to filter or forward unknown uni-
cast, multicast and VLAN packets
Features
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• Switch Management Capabilities
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Self-address filtering for implementing ring topologies
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10/100/1000Mbps Ethernet switch basic functions:
frame buffer management, address look-up table,
queue management, MIB counters
• Comprehensive Configuration Registers Access
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High-speed 4-wire SPI (up to 50MHz), I C interfaces
provide access to all internal registers
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Non-blocking store-and-forward switch fabric assures
fast packet delivery by utilizing 4096 entry forwarding
table with 256kByte frame buffer
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MII Management (MIIM, MDC/MDIO 2-wire) Interface
provides access to all PHY registers
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In-band management via any of the data ports
I/O pin strapping facility to set certain register bits from
I/O pins at reset time
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Jumbo packet support up to 9000 bytes
Port mirroring/monitoring/sniffing:
ingress and/or egress traffic to any port
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On-the-fly configurable control registers
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MIB counters for fully-compliant statistics gathering
34 counters per port
• Power Management
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Energy detect power-down mode on cable disconnect
Tail tagging mode (one byte added before FCS) sup-
port at host port to inform the processor which ingress
port receives the packet and its priority
Dynamic clock tree control
Unused ports can be individually powered down
Full-chip software power-down
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Loopback modes for remote failure diagnostics
Rapid spanning tree protocol (RSTP) support for topol-
ogy management and ring/linear recovery
Multiple spanning tree protocol (MSTP) support
Wake-on-LAN (WoL) standby power mode with PME
interrupt output for system wake upon triggered events
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2017-2019 Microchip Technology Inc.
DS00002330D-page 1
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