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KS8995MA Datasheet(PDF) 30 Page - Micrel Semiconductor |
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KS8995MA Datasheet(HTML) 30 Page - Micrel Semiconductor |
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30 / 89 page  Micrel, Inc. KS8995MA/FQ December 2012 30 M9999-121212-3.0 Media Access Controller (MAC) Operation The KS8995MA/FQ strictly abides by IEEE 802.3 standards to maximize compatibility. Inter-Packet Gap (IPG) If a frame is successfully transmitted, the 96-bit time IPG is measured between the two consecutive MTXEN. If the current packet is experiencing collision, the 96-bit time IPG is measured from MCRS and the next MTXEN. Backoff Algorithm The KS8995MA/FQ implements the IEEE Std. 802.3 binary exponential back-off algorithm, and optional “aggressive mode” back off. After 16 collisions, the packet will be optionally dropped depending on the chip configuration in Register 3. See “Register 3.” Late Collision If a transmit packet experiences collisions after 512-bit times of the transmission, the packet will be dropped. Illegal Frames The KS8995MA/FQ discards frames less than 64 bytes and can be programmed to accept frames up to 1536 bytes in Register 4. For special applications, the KS8995MA/FQ can also be programmed to accept frames up to 1916 bytes in Register 4. Since the KS8995MA/FQ supports VLAN tags, the maximum sizing is adjusted when these tags are present. Flow Control The KS8995MA/FQ supports standard 802.3x flow control frames on both transmit and receive sides. On the receive side, if the KS8995MA/FQ receives a pause control frame, the KS8995MA/FQ will not transmit the next normal frame until the timer, specified in the pause control frame, expires. If another pause frame is received before the current timer expires, the timer will be updated with the new value in the second pause frame. During this period (being flow controlled), only flow control packets from the KS8995MA/FQ will be transmitted. On the transmit side, the KS8995MA/FQ 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 KS8995MA/FQ flow controls a port that has just received a packet if the destination port resource is busy. The KS8995MA/FQ issues a flow control frame (XOFF), containing the maximum pause time defined in IEEE standard 802.3x. Once the resource is freed up, the KS8995MA/FQ 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 KS8995MA/FQ flow controls all ports if the receive queue becomes full. |
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