KSZ8864RMNI MICREL [Micrel Semiconductor], KSZ8864RMNI Datasheet - Page 30

• Manufacturer Part Number: KSZ8864RMNI
• Description: Integrated 4-Port 10/100 Managed Switch with Two MACs MII or RMII Interfaces
• Manufacturer: MICREL [Micrel Semiconductor]

Micrel, Inc.
KSZ8864RMN
On the transmit side, the KSZ8864RMN has intelligent and efficient ways to determine when to invoke flow control.
The flow control is based on availability of the system resources, including available buffers, available transmit
queues and available receive queues.
The KSZ8864RMN flow controls a port that has just received a packet if the destination port resource is busy. The
KSZ8864RMN issues a flow control frame (XOFF), containing the maximum pause time defined in IEEE standard
802.3x. Once the resource is freed up, the KSZ8864RMN sends out the other flow control frame (XON) with zero
pause time to turn off the flow control (turn on transmission to the port). A hysteresis feature is also provided to
prevent over-activation and deactivation of the flow control mechanism.
The KSZ8864RMN flow controls all ports if the receive queue becomes full.
Figure 4. Destination Address Lookup Flow Chart, Stage 1
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September 2011
M9999-092011-1.4