KSZ8893FQL-FX Micrel Inc, KSZ8893FQL-FX Datasheet - Page 43

• Manufacturer Part Number: KSZ8893FQL-FX
• Description: 2+1 Port 10/100 Switch W/Tranceivers & Frame Buffers, ( )
• Manufacturer: Micrel Inc

Specifications of KSZ8893FQL-FX

• Controller Type: Ethernet Switch Controller
• Interface: MII, RMII, SNI
• Voltage - Supply: 3.1 V ~ 3.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 128-MQFP, 128-PQFP
• Number Of Primary Switch Ports: 3
• Internal Memory Buffer Size: 32
• Operating Supply Voltage (typ): 3.3V
• Fiber Support: Yes
• Integrated Led Drivers: Yes
• Power Supply Type: Analog/Digital
• Package Type: PQFP
• Vlan Support: Yes
• Operating Temperature (max): 70C
• Operating Temperature (min): 0C
• Pin Count: 128
• Mounting: Surface Mount
• Jtag Support: No
• Operating Temperature Classification: Commercial
• Data Rate: 1000Mbps
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 576-1603 - EVAL KIT EXPERIMENTAL KSZ8893MQL
• Current - Supply: -
• Lead Free Status / RoHS Status: Compliant, Lead free / RoHS Compliant
• Other names: 576-3273

Micrel, Inc.
Special Tagging Mode
Special Tagging Mode is designed for spanning tree protocol IGMP snooping and is flexible for use in other
applications. Special Tagging, similar to 802.1Q Tagging, requires software to change network drivers to
insert/modify/strip/interpret the special tag. This mode is enabled by setting both register 11 bit [0] and register 48 bit [2]
to ‘1’.
The STPID is only seen and used by the port 3 interface, which should be connected to a processor. Packets from the
processor to the switch’s port 3 should be tagged with the STPID and the port mask, defined as follows:
Packets with normal tags (“0000” port masks) will use KSZ8893FQL internal MAC table look-up to determine the
forwarding port(s). Also, if packets from the processor are not tagged, the KSZ8893FQL will treat them as normal
packets and use internal MAC table lookup to determine the forwarding port(s).
The KSZ8893FQL uses a non-zero “port mask” to bypass the internal MAC table lookup result, and override any port
setting, regardless of port states (disable, blocking, listening, and learning). The table below shows the processor to
switch egress rules when dealing with STPID.
October 2007
(0x810 + port mask)
(0x810 + port mask)
(0x810 + port mask)
(0x810 + port mask)
Ingress Tag Field
Not Tagged
“0001”, forward packet to port 1 only
“0010”, forward packet to port 2 only
“0011”, broadcast packet to port 1 and port 2
TPID (tag protocol identifier, 0x8100) + TCI
TX port “tag
insertion”
Don’t care
Table 16. STPID Egress Rules (Processor to Switch Port 3)
0
0
1
1
802.1Q Tag Format
Table 15. Special Tagging Mode Format
TX port “tag
Don’t care
removal”
0
1
0
1
Egress Action to Tag Field
- Modify tag field to 0x8100
- Recalculate CRC
- No change to TCI if not null VID
- Replace VID with ingress (port 3) port VID if null VID
- (STPID + TCI) will be removed
- Padding to 64 bytes if necessary
- Recalculate CRC
- Modify tag field to 0x8100
- Recalculate CRC
- No change to TCI if not null VID
- Replace VID with ingress (port 3) port VID if null VID
- Modify tag field to 0x8100
- Recalculate CRC
- No change to TCI if not null VID
- Replace VID with ingress (port 3) port VID if null VID
- Determined by the Dynamic MAC Address Table
43
STPID (special tag identifier, 0x810 +
4 bit for “port mask”) + TCI
Special Tag Format
M9999-101607-1.3
KSZ8893FQL