www.micrel.com
KSZ8842-16MQL
KSZ8842-32MQL
Product Brief
2-Port Ethernet Switch with
Non-PCI Interface
Description
The KSZ8842-16MQL and KSZ8842-32MQL are the
industry鈥檚 鏗乺st 2-port switches with a non-PCI CPU inter-
face. The KSZ8842-16MQL (or -32MQL) is a proven, 4th
generation, integrated, Layer 2 switch that is compliant to
the IEEE802.3u standard.
The KSZ8842-16MQL (or -32MQL) can be con鏗乬ured
as a low-latency repeater to allow for 鈥榗ut thru鈥?in latency
critical Embedded or Industrial Ethernet applications. For
industrial automation applications in the repeater mode, the
KSZ8842-16MQL (or -32MQL) runs in half-duplex mode
regardless of the application.
The KSZ8842-16MQL (or -32MQL) offers an extensive
feature set that includes tag/port-based VLAN, QoS priority
management, MAC 鏗乴tering function, MIB counters, and
CPU control/data interfaces to effectively address both
current and emerging Fast Ethernet applications.
The KSZ8842-16MQL (or -32MQL) contains two 10/100
transceivers with patented mixed-signal low-power technol-
ogy, 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 on-chip
frame buffer memory.
Bene鏗乼s
Offers all of the features of an integrated Layer 2
managed switch plus:
鈥?Fully compliant to the IEEE802.3u standard
鈥?Repeater mode capabilities to allow for 鈥榗ut-thru鈥?/div>
in latency critical Industrial Ethernet or Embedded
Ethernet applications
鈥?MAC 鏗乴tering function to 鏗乴ter unicast packets
鈥?Dynamic buffer memory scheme
鈥?Essential for applications such as Video over IP
where image jitter is unacceptable
鈥?2-Port switch with 鏗俥xible 8-, 16- or 32-bit generic
host processor interfaces
鈥?Micrel LinkMD
廬
cable diagnostic capabilities to
determine cable length, diagnose faulty cables, and
determine distance to fault
鈥?HP Auto MDIX crossover with disable and enable
option
鈥?Industrial temperature support: 鈥?0
o
C to +85
o
C
(KSZ8842-16MVLI samples available)
鈥?Four priority queues to handle voice, video, data,
and control packets
Block Diagram
HP Auto
MDI/MDI-X
1K Look-up
Engine
10/100
T/TX
PHY 1
10/100
MAC 1
FIFO, Flow Control, VLAN Tagging, Priority
HP Auto
MDI/MDI-X
10/100
T/TX
PHY 2
10/100
MAC 2
Queue
Management
DMA
Channel
Embedded
Processor Interface
Buffer
Management
Non-PCI
CPU
Bus Interface Unit
Frame
Buffers
8,16, 32-bit
Generic
Host Interface
MIB
Counters
Control
Registers
EEPROM
Interface
EEPROM I/F
P1 LED[3:0]
P2 LED[3:0]
LED
Drivers
Note: For an MII/RMII, I
2
C or SPI interface, use the KSZ8893MQL.
LinkMD is a registered trademark of Micrel, Inc.
Micrel, Inc.
TEL:
1.408.944.0800
FAX:
1.408.474.1000
HTTP://
www.micrel.com
MICREL
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