Micrel Semiconductor
TEL:
1.408.944.0800
FAX:
1.408.474.1000
HTTP://
www.micrel.com
Queue
Management
Buffer
Management
Frame
Buffers
FIFO, Flow Control,
VLAN Tagging, Priority
10/100
MAC 1
10/100
MAC 2
10/100
T/TX
PHY 1
10/100
T/TX
PHY 2
EEPROM
Interface
HP Auto
MDI/MDI-X
HP Auto
MDI/MDI-X
MIB
Counters
P1 LED[3:0]
P2 LED[3:0]
EEPROM I/F
Non-PCI
CPU
Bus Interface Unit
Embedded
Processor Interface
8/16/32 Bit
Generic Host Interface
Control
Registers
Drivers
LED
1K Look-Up
Engine
DMA
Channel
Benefits
Offers all of the features of an integrated Layer 2
managed switch plus:
Fully compliant to the IEEE 802.3u standard
Repeater mode capabilities to allow for `cut-thru' in
latency critical Industrial Ethernet or Embedded
Ethernet applications
MAC filtering function to filter unicast packets
Dynamic buffer memory scheme
Essential for applications such as Video over IP
where image jitter is unacceptable
2-Port switch with flexible 8/16/32 bit generic host
processor interface
Micrel LinkMD
TM
cable diagnostic capabilities to
determine cable length, diagnose faulty cables, and
determine distance to fault
HP Auto MDI-X crossover with disable and enable
option
Industrial Temperature support: 40
o
C to +85
o
C
available from Q4
Four priority queues to handle voice, video, data,
and control packets
www.micrel.com
Note: For an MII/RMII, I
2
C or SPI interface, use the KS8883ML.
LinkMD is a trademark of Micrel, Inc.
Description
The KS8842M is the industry's first fully managed 2-port
switch with a non-PCI CPU interface. The KS8842 is a
proven, 4th generation, integrated Layer 2 switch that is
compliant to the IEEE 802.3u standard.
The KS8842M can also be configured as a low-latency
repeater to allow for `cut thru' in latency critical Embedded
or Industrial Ethernet applications. For industrial automa-
tion applications in the repeater mode, the KS8842M runs
in half-duplex mode regardless of the application.
The KS8842M offers an extensive feature set that includes
tag/port-based VLAN, QoS priority management, MAC
filtering function, MIB counters, and CPU control/data
interfaces to effectively address both current and emerg-
ing Fast Ethernet applications.
The KS8842 contains two 10/100 transceivers with pat-
ented mixed-signal low-power technology, two media ac-
cess control (MAC) units and 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.
Block Diagram
Block Diagram
Block Diagram
Block Diagram
Block Diagram
KS8842-16MQL
KS8842-32MQL
Product Brief
2-Port Ethernet Switch
with Non-PCI Interface
Applications
Industrial applications for daisy chaining
multiple devices
Industrial control in latency critical
applications
Port redundancy and port monitoring
Security cameras
VoIP phone and ATA adaptors
PDF 
ZIP