KS8999_11 MICREL [Micrel Semiconductor], KS8999_11 Datasheet - Page 27

• Manufacturer Part Number: KS8999_11
• Description: Integrated 9-Port 10/100 Switch with PHY and Frame Buffer
• Manufacturer: MICREL [Micrel Semiconductor]

January 2005
Micrel, Inc.
The table below briefly summarizes VLAN features. For more detailed settings see the EEPROM register description.
Station MAC Address (control frames only)
The MAC source address can be programmed as used in flow control frames. The table below briefly summarizes
this programmable feature.
EEPROM Operation
The EEPROM interface utilizes 2 pins that provide a clock and a serial data path. As part of the initialization
sequence, the KS8999 reads the contents of the EEPROM and loads the values into the appropriate registers. Note
that the first two bytes in the EEPROM must be “55” and “99” respectively for the loading to occur properly. If these
first two values are not correct, all other data will be ignored.
Data start and stop conditions are signaled on the data line as a state transition during clock high time. A high to low
transition indicates start of data and a low to high transition indicates a stop condition. The actual data that traverses
the serial line changes during the clock low time.
The KS8999 EEPROM interface is compatible with the Atmel AT24C01A part. Address A0, A1 and A2 are fixed to
000. Further timing and data sequences can be found in the Atmel AT24C01A specification.
Register(s)
Register(s)
13-21
22-39
48-53
4-12
4-12
2
Bit(s)
Bit(s)
7-0
7-0
7-0
2
1
0
Global/Port
Global/Port
Global
Global
Port
Port
Port
Port
Description
Insert VLAN Tags: If specified, will add VLAN tags to frames without existing tags
Strip VLAN Tags: If specified, will remove VLAN tags from frames if they exist
VLAN Enforcement: Allows unicast frames to adhere or ignore the VLAN configuration
VLAN Mask Registers: Allows configuration of individual VLAN grouping.
VLAN Tag Insertion Values: Specifies the VLAN tag to be inserted if enabled (see
above)
Description
Station MAC Address: Used as source address for MAC control frames as used in full
duplex flow control mechanisms.
Table 4. VLAN Control
Table 5. Misc. Control
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