Memory Integrated Circuits MTFC32GAZAQHD-WT TR FBGA eMMC

Product Description:

The KSZ8999 supports MDI/MDI-X auto crossover. This facilitates the use of either a straight connection CAT-5 cable or a crossover CAT-5 cable. The auto-sense function will detect remote transmit and receive pairs, and correctly assign the transmit and receive pairs from the Microchip device. This can be highly useful when end users are unaware of cable types and can also save on an additional uplink configuration connection. The auto MDI/MDI-X is achieved by the Microchip device listening for the far end transmission channel and assigning transmit/receive pairs accordingly. Auto MDI/MDI-X can be disabled by pulling Pin 87 (AUTOMDIX) to low.

The KS8999 conforms to the auto-negotiation protocol as described by the 802.3 committee. Auto-negotiation allows UTP (Unshielded Twisted Pair) link partners to select the best common mode of operation. In auto-negotiation the link partners advertise capabilities across the link to each other. If auto-negotiation is not supported or the link partner to the KS8999 is forced to bypass auto-negotiation, then the mode is set by observing the signal at the receiver. This is known as parallel mode because while the transmitter is sending auto-negotiation advertisements, the receiver is listening for advertisements or a fixed signal protocol. The flow for the link set up is depicted below.

The KSZ8999 will forward packets as follows: • If the DA look-up results is a “match”, the KSZ8999 will use the destination port information to determine where the packet goes. • If the DA look-up result is a “miss”, the KSZ8999 will forward the packet to all other ports except the port that received the packet. • All the multicast and broadcast packets will be forwarded to all other ports except the source port. The KSZ8999 will not forward the following packets: • Error packets. These include framing errors, FCS errors, alignment errors, and illegal size packet errors. • 802.3x pause frames. The KSZ8999 will intercept these packets and do the appropriate actions. • “Local” packets. Based on destination address (DA) look-up. If the destination port from the look-up table matches the port where the packet was from, the packet is defined as “local”.

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Quality Warranty Period:12 Months.

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All products were tested before shipment, and the quality problems were negligible.

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