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VSC7440 Datasheet(PDF) 310 Page - Microsemi Corporation |
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VSC7440 Datasheet(HTML) 310 Page - Microsemi Corporation |
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310 / 444 page  Functional Descriptions VMDS-10492 VSC7440 Datasheet Revision 4.2 293 Figure 93 • PAUSE Command 3.31 Energy Efficient Ethernet The Ethernet ports support Energy Efficient Ethernet (EEE) to reduce power consumption when there is little or no traffic on a port. The state diagram in the following illustration shows the EEE LPI algorithm implemented in the device. Figure 94 • EEE State Diagram • LPI_EMPTY: Low power mode. Port has no frames for transmission. • LPI_NONEMPTY: Low power mode. Port has frames for transmission, but the number of frames is very limited (below EEE_URGENT_THRES in OQS) or EEE_TIMER_AGE has not passed yet. • ACTIVATING: Port is being activated prior to restarting frame transmission. The timer EEE_TIMER_WAKEUP controls the length of the activation time. • ACTIVE_NONEMPTY: Port is active and transmitting. This is the normal state for ports without EEE enabled. • ACTIVE_EMPTY: Port is active, but currently has no frames for transmission. If frames for transmission do not become available within EEE_TIMER_HOLDOFF, then the port enters low power mode (in state LPI_EMPTY). Pause value (µs) Request: 32 bits 0100 LPI EMPTY LPI NONEMPTY ACTIVATING ACTIVE NONEMPTY Transmitting ACTIVE EMPTY Port has frame(s) for transmission EEE_TIMER_WAKEUP passed Port has no frames for transmission EEE_TIMER_HOLDOFF passed EEE_TIMER_AGE passed OR Port queue(s) in OQS exceed FWD_PRESS_THRES watermark Port has frame(s) for transmission Port queue(s) in OQS exceed FWD_PRESS_THRES watermark |
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