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KSZ8842-16MQL fiches techniques PDF

Micrel Semiconductor - 2-Port Ethernet Switch

Numéro de référence KSZ8842-16MQL
Description 2-Port Ethernet Switch
Fabricant Micrel Semiconductor 
Logo Micrel Semiconductor 





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KSZ8842-16MQL fiche technique
KSZ8842-16/32
MQL/MVL/MVLI/MBL
2-Port Ethernet Switch with Non-PCI Interface
Data Sheet Rev 1.9
General Description
The KSZ8842-series of 2-port switches includes PCI and
non-PCI CPU interfaces, and are available in 8/16-bit
and 32-bit bus designs (see Ordering Information).
This datasheet describes the KSZ8842M-series of non-
PCI CPU interface chips. For information on the
KSZ8842 PCI CPU interface switches, refer to the
KSZ8842P datasheet.
The KSZ8842M is the industry’s first fully managed, 2-
port switch with a non-PCI CPU interface. It is based on
a proven, 4th generation, integrated Layer-2 switch,
compliant with IEEE 802.3u standards. Also an industrial
temperature grade version of the KSZ8842, the
KSZ8842MVLI, can be ordered (see Ordering
Information).
The KSZ8842M can be configured as a switch or as a
low-latency (310 nanoseconds) repeater in latency-
critical, embedded or industrial Ethernet applications.
For industrial applications, the KSZ8842M can run in
half-duplex mode regardless of the application.
Functional Diagram
LinkMD®
The KSZ8842M 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.
The KSZ8842M 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.
P 1 H P A u to
M D I/M D I-X
P 2 H P A u to
M D I/M D I-X
10 /10 0 B ase -
T /T X
PHY 1
10 /10 0 B ase -
T /T X
PHY 2
10 /1 00
MAC 1
10 /1 00
MAC 2
Em bedded
P ro ce ss o r In te rfa c e
N on-P C I
CPU
Bus
In te rfa c e
U nit
QMU
DMA
C hannel
8 ,1 6 , o r 3 2 -b it
G en eric H o st
In te rface
P 1 L E D [3 :0 ]
P 2 L E D [3 :0 ]
www.DataSheet4U.com
E E P R O M I/F
LED
D rive rs
RXQ
4KB
TXQ
4KB
C on trol
R e g is te rs
S w itc h
H ost
MAC
1 K lo o k -u p
E n g in e
S c h e d u lin g
M anagem ent
B uffe r
M anagem ent
F ram e
B u ffers
M IB
C ou nte rs
EEPROM
Inte rface
Figure 1. KSZ8842M Functional Diagram
LinkMD is a registered trademark of Micrel, Inc.
Product names used in this datasheet are for identification purposes only and may be trademarks of their respective companies
October 2007
1
M9999-102207-1.9

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