KSZ8842-PMQL Micrel Inc, KSZ8842-PMQL Datasheet - Page 31
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KSZ8842-PMQL
Manufacturer Part Number
KSZ8842-PMQL
Description
2-Port Ethernet Switch/Repeater + 32-bit/33MHz PCI Bus Interface( )
Manufacturer
Micrel Inc
Specifications of KSZ8842-PMQL
Controller Type
Ethernet Switch Controller
Interface
PCI
Voltage - Supply
3.1 V ~ 3.5 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
128-MQFP, 128-PQFP
Number Of Primary Switch Ports
2
Internal Memory Buffer Size
32
Operating Supply Voltage (typ)
3.3V
Fiber Support
Yes
Integrated Led Drivers
Yes
Phy/transceiver Interface
MII
Power Supply Type
Analog/Digital
Package Type
PQFP
Data Rate (typ)
10/100Mbps
Vlan Support
Yes
Operating Temperature (max)
70C
Operating Temperature (min)
0C
Pin Count
128
Mounting
Surface Mount
Jtag Support
No
Operating Supply Voltage (max)
3.5V
Operating Supply Voltage (min)
3.1V
Operating Temperature Classification
Commercial
Data Rate
100Mbps
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
576-1636 - BOARD EVALUATION KSZ8842-PMQL
Current - Supply
-
Lead Free Status / RoHS Status
Compliant, Lead free / RoHS Compliant
Other names
576-1513-5
KSZ8842-PMQL
KSZ8842-PMQL
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
KSZ8842-PMQLI
Manufacturer:
TI
Quantity:
3 100
Micrel, Inc.
after the internal lookup. The KSZ8842-PMQL/PMBL forwards the packet to both port 1 and the host port.
“receive and transmit” mirror on two ports
All the packets received on port A and transmitted on port B are mirrored on the sniffer port. To turn on the “AND”
feature, set register SGCR2, bit 8 to “1”. For example, port 1 is programmed to be “receive sniff”, port 2 is programmed
to be “transmit sniff”, and the host port is programmed to be the “sniffer port”. A packet received on port 1 is destined to
port 2 after the internal lookup. The KSZ8842-PMQL/PMBL forwards the packet to both port 2 and the host port.
Multiple ports can be selected as “receive sniff” or “transmit sniff”. In addition, any port can be selected as the “sniffer
port”. All these per port features can be selected through registers P1CR2, P2CR2, and P3CR2 for ports 1, 2, and the
host port, respectively.
IEEE 802.1Q VLAN Support
The KSZ8842-PMQL/PMBL supports 16 active VLANs out of the 4096 possible VLANs specified in the IEEE 802.1Q
specification. KSZ8842-PMQL/PMBL provides a 16-entry VLAN table, which converts the 12-bits VLAN ID (VID) to the
4-bits Filter ID (FID) for address lookup. If a non-tagged or null-VID-tagged packet is received, the ingress port default
VID is used for lookup. In VLAN mode, the lookup process starts with VLAN table lookup to determine whether the VID
is valid. If the VID is not valid, the packet is dropped and its address is not learned. If the VID is valid, the FID is
retrieved for further lookup. The FID + Destination Address (FID+DA) are used to determine the destination port. The
FID + Source Address (FID+SA) are used for address learning. (See Tables 12 and 13.)
QoS Priority Support
The KSZ8842-PMQL/PMBL provides Quality of Service (QoS) for applications such as VoIP and video conferencing.
Offering four priority queues per port, the per-port transmit queue can be split into four priority queues: Queue 3 is the
highest priority queue and Queue 0 is the lowest priority queue. Bit 0 of registers P1CR1, P2CR1, and P3CR1 is used
to enable split transmit queues for ports 1, 2, and the host port, respectively.
Port-Based Priority
With port-based priority, each ingress port can be individually classified as a high-priority receiving port. All packets
October 2007
FID+SA found in
Dynamic MAC
DA found in
Static MAC
Table?
Table?
Yes
Yes
Yes
Yes
Yes
No
No
No
Action
Learn and add FID+SA to the Dynamic MAC Address Table
Update time stamp
Use FID flag?
Don’t care
Don’t care
0
1
1
1
Table 5. FID+DA Lookup in VLAN Mode
Table 6. FID+SA Lookup in VLAN Mode
FID match?
Don’t care
Don’t care
Don’t care
Yes
No
No
DA+FID found in
Dynamic MAC
31
Don’t care
Don’t care
Table?
Yes
Yes
No
No
Action
Broadcast to the membership ports
defined in the VLAN Table bits [18:16]
Send to the destination port defined in the
Dynamic MAC Address Table bits [53:52]
Send to the destination port(s) defined in
the Static MAC Address Table bits [50:48]
Broadcast to the membership ports
defined in the VLAN Table bits [18:16]
Send to the destination port defined in the
Dynamic MAC Address Table bits [53:52]
Send to the destination port(s) defined in
the Static MAC Address Table bits [50:48]
KSZ8842-PMQL/PMBL
M9999-100207-1.5