Appendix A: Data Sheet Revision History ........................................................................................................................................... 92
The Microchip Website ........................................................................................................................................................................ 93
Customer Change Notification Service ............................................................................................................................................... 93
Customer Support ............................................................................................................................................................................... 93
Product Identification System .............................................................................................................................................................. 94
DS00002229D-page 4
2018 Microchip Technology Inc.
KSZ8864CNX/RMNUB
1.0
1.1
INTRODUCTION
General Description
The KSZ8864CNX/RMNUB is a highly-integrated, Layer 2-managed 4-port switch with optimized design, plentiful fea-
tures and smallest package size. It is designed for cost-sensitive 10/100 Mbps 4-port switch systems with on-chip ter-
mination, lowest-power consumption, and small package to save system cost. It has 1.4 Gbps high-performance
memory bandwidth, shared memory-based switch fabric with full non-blocking configuration. It also provides an exten-
sive feature set such as the power management, programmable rate limiting and priority ratio, tag/port-based VLAN,
packet filtering, quality-of-service (QoS), four queue prioritization, management interface, MIB counters. Port 3 and Port
4 support either MII or RMII interfaces with SW3-MII/RMII and SW4-MII/RMII (see
Figure 1-1)
for KSZ8864CNX/
RMNUB data interface. An industrial temperature-grade version of the KSZ8864CNXIA and a qualified AEC-Q100 Auto-
motive version of the KSZ8864RMNUB are also available (see
Section “Product Identification System”).The
KSZ8864CNX/RMNUB provides multiple CPU control/data interfaces to effectively address both current and emerging
fast Ethernet applications.
The KSZ8864CNX/RMNUB consists of 10/100 fast Ethernet PHYs with patented and enhanced mixed-signal technol-
ogy, media access control (MAC) units, a high-speed non-blocking switch fabric, a dedicated address lookup engine,
and an on-chip frame buffer memory.
The KSZ8864CNX/RMNUB contains four MACs and two PHYs. The two PHYs support the 10/100Base-T/TX.
All registers of MACs and PHYs units can be managed by the control interface of SPI or the SMI. MIIM registers of the
PHYs can be accessed through the MDC/MDIO interface. EEPROM can set all control registers by I
2
C controller inter-
face for the unmanaged mode.
The KSZ8864CNX/RMNUB adds Microchip's LinkMD
®
feature and is completely pin-compatible with the KSZ8864RMN
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