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    參數(shù)資料
    型號(hào): MC68EN302CPV20BT
    廠商: FREESCALE SEMICONDUCTOR INC
    元件分類: 微控制器/微處理器
    英文描述: 4 CHANNEL(S), 10M bps, LOCAL AREA NETWORK CONTROLLER, PQFP144
    封裝: 20 X 20 MM, 1.40 MM HEIGHT, 0.50 MM PITCH, PLASITC, LQFP-144
    文件頁數(shù): 64/128頁
    文件大?。?/td> 641K
    代理商: MC68EN302CPV20BT
    MOTOROLA
    MC68EN302 REFERENCE MANUAL
    4-1
    SECTION 4
    ETHERNET CONTROLLER
    The MC68EN302, like the MC68360 QUICC, provides full duplex Ethernet along with
    multiprotocol support on the SCC channels. On the MC68EN302, the Ethernet controller is
    independent of the CPM and therefore the MC68EN302 provides the Ethernet channel in
    addition to the pre-existing 302 SCC channels without sacrificing any SCC pins. The
    Ethernet controller consists of an 802.3/Ethernet MAC layer protocol machine with an
    internal CAM, transmit and receive FIFOs, buffer descriptor memory and a dual channel
    DMA controller. The buffer descriptor memory, CAM and DMA controller all interface to the
    module bus. A block diagram of the Ethernet controller is shown in Figure 4-1.
    Features are:
    802.3 Ethernet compliant MAC layer (1-10 Mbps) with industry standard interface
    Full-duplex operation
    128 byte transmit and receive FIFOs
    Collision retry does not generate extra bus bandwidth
    Collision fragments automatically discarded
    64 entry CAM with optional hash mode
    Buffer descriptor memory on-chip
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