KSZ9021GN
Gigabit Ethernet Transceiver
with GMII / MII Support General Description Features The KSZ9021GN is a completely integrated triple speed Single-chip 10/100/1000Mbps IEEE 802.3 compliant
(10Base-T/100Base-TX/1000Base-T) Ethernet Physical
Ethernet Transceiver
Layer Transceiver for transmission and reception of data GMII/MII standard compliant interface
on standard CAT-5 unshielded twisted pair (UTP) cable. Auto-negotiation to automatically select the highest link
The KSZ9021GN provides the industry standard GMII/MII
up speed (10/100/100Mbps) and duplex (half/full)
(Gigabit Media Independent Interface / Media Independent On-chip termination resistors for the differential pairs
Interface) for connection to GMII/MII MACs in Gigabit On-chip LDO controller to support single 3.3V supply
Ethernet Processors and Switches for data transfer at
operation – requires only external FET to generate 1.2V
1000 Mbps or 10/100Mbps speed.
for the core
The KSZ9021GN reduces board cost and simplifies board Jumbo frame support up to 16KB
layout by using on-chip termination resistors for the four 125MHz Reference Clock Output
differential pairs and by integrating a LDO controller to
drive a low cost MOSFET to supply the 1.2V core. Programmable LED outputs for link, activity and speed
The KSZ9021GN provides diagnostic features to facilitate Baseline Wander Correction
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system bring-up and debugging in production testing and LinkMD TDR-based cable diagnostics for identification
in product deployment. Parametric NAND tree support …