KSZ8862-16/32MQL
2-Port Ethernet Switch with Non-PCI Interface
and Fiber Support
Rev 3.1
General Description
The KSZ8862M is 2-port switch with non-PCI CPU
interface and fiber support, and is available in 8/16-bit
and 32-bit bus designs (see Ordering Information). This
datasheet describes the KSZ8862M non-PCI CPU
interface chip.
®
LinkMD
In copper mode, port 2 supports 10/100BASE-T/TX with
HP Auto MDI/MDI-X for reliable detection of and
correction for straight-through and crossover cables.
The KSZ8862M is the industry’s first fully managed, 2-
port switch with a non-PCI CPU interface and fiber
support. It is based on a proven, 4th generation,
integrated Layer-2 switch, compliant with IEEE 802.3u
standards.
Micrel’s
proprietary
LinkMD®
Time
Domain
Reflectometry (TDR)-based function is also available for
determining the cable length, as well as cable
diagnostics for identifying faulty cabling.
For industrial applications, the KSZ8862M can run in
half-duplex mode regardless of the application.
The KSZ8862M offers an extensive feature set that
includes tag/port-based VLAN, quality of service (QoS)
priority management, management information base
(MIB) counters, and CPU control/data interfaces to
effectively address Fast Ethernet applications.
In fiber mode, port 1 can be configurable to either
100BASE-FX or 100BASE-SX/10BASE-FL.
The LED driver and post amplifier are also included for
10Base-FL and 100Base-SX applications.
The KSZ8862M contains: Two 10/100 transceivers with
patented, mixed-signal, low-power technology, two
media access control (MAC) units, a direct memory
access (DMA) channel, a high-speed, non-blocking,
switch fabric, a dedicated 1K entry forwarding table, and
an on-chip frame buffer memory.
Functional Diagram
T X
1 K lo o k -u p
E n g in e
L E D
D r iv e r
1 0 /1 0 0 B a s e -
F L /F X /S X
P H Y
1 0 /1 0 0
M A C
P o r t
1
1
F ib e r
P o s t
A m p
1
R X
S c h e d u lin g
M a n a g e m e n t
1 0 /1 0 0 B a s e -
T /T X
1 0 /1 0 0
M A C
P o rt
2
2
C o p p e r
P H Y
2
B u ff e r
M a n a g e m e n t
R X Q
4 K B
Q M U
D M A
C h a n n e l
S w it c h
H o s t
N o n -P C I
C P U
M A C
T X Q
4 K B
e d
E m b e d d
In te r fa c e
B u s
In t e rf a c e
U n it
r
F ra m e
B u ffe rs
P ro c e s s o
C o n tr o l
R e g is te rs
8 ,1 6 , o r 3 2 -b it
G e n e ric H o s t
In t e rf a c e
M IB
C o u n t e rs
P 1 L E D [3 :0 ]
P 2 L E D [3 :0 ]
L E D
D riv e r s
E E P R O M
In te rfa c e
E E P R O M I/F
Figure 1. KSZ8862M Functional Diagram
LinkMD is a registered trademark of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
M9999-081310-3.1
August 2010