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KSZ8873MLLJ Datasheet(PDF) 31 Page - Micrel Semiconductor

Part No. KSZ8873MLLJ
Description  Integrated 3-Port 10/100 Managed Switch with PHYs
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Maker  MICREL [Micrel Semiconductor]
Homepage  http://www.micrel.com
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KSZ8873MLLJ Datasheet(HTML) 31 Page - Micrel Semiconductor

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Micrel, Inc.
KSZ8873MLLJ
September 2011
31
M9999-091911-1.8
Advanced Switch Functions
Bypass Mode
The KSZ8873MLLJ also offer a by-pass mode which enables system-level power saving. When the CPU (connected to
Port 3) enters a power saving mode of power down or sleeping mode, the CPU can control the pin 27
SMTXER3/MII_LINK_3 which can be tied high so that the KSZ8873MLLJ detect this change and automatically switches to
the by-pass mode in which the switch function between Port1 and Port2 is sustained. In the by-pass mode, the packets
with DA to port 3 will be dropped and by pass the internal buffer memory, make the buffer memory more efficiency for the
data transfer between port 1 and port 2. Specially, the power saving get more in energy detect mode with the by-pass to
be used.
IEEE 802.1Q VLAN Support
The KSZ8873MLLJ supports 16 active VLANs out of the 4096 possible VLANs specified in the IEEE 802.1Q specification.
KSZ8873MLLJ provides a 16-entries 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.
DA found in Static MAC
Table?
Use FID flag?
FID match?
DA+FID
found in
Dynamic
MAC Table?
Action
No
Don’t care
Don’t care
No
Broadcast to the membership ports
defined in the VLAN Table bits [18:16]
No
Don’t care
Don’t care
Yes
Send to the destination port defined in the
Dynamic MAC Address Table
bits [53:52]
Yes
0
Don’t care
Don’t care
Send to the destination port(s) defined in
the Static MAC Address Table bits [50:48]
Yes
1
No
No
Broadcast to the membership ports
defined in the VLAN Table bits [18:16]
Yes
1
No
Yes
Send to the destination port defined in the
Dynamic MAC Address Table
bits [53:52]
Yes
1
Yes
Don’t care
Send to the destination port(s) defined in
the Static MAC Address Table bits [50:48]
Table 6. FID+DA Lookup in VLAN Mode
FID+SA found in Dynamic MAC Table?
Action
No
Learn and add FID+SA to the Dynamic MAC Address Table
Yes
Update time stamp
Table 7. FID+SA Lookup in VLAN Mode
Advanced VLAN features, such as “Ingress VLAN filtering” and “Discard Non PVID packets” are also supported by the
KSZ8873MLLJ. These features can be set on a per port basis, and are defined in register 18, 34 and 50 for ports 1, 2 and
3, respectively.


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