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XC4036XL-1BG352C

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File Size : 116 KB Manufacturer:XILINX Description:The primary function of the ENDEC unit (Figure 1-2 ) is to perform the encoding and decoding necessary for compati- bility between the differential pair Manchester encoded data of the transceiver and the Non-Return-to-Zero (NRZ) serial data of the MAC unit data line In addition to encoding and decoding the data stream the ENDEC also supplies all the necessary special signals (e g collision detect carrier sense and clocks) to the MAC unit The signals provided to the MAC unit from the on-chip ENDEC are also provided as outputs to the user Manchester Encoder and Differential Output Driver During transmission to the network the ENDEC unit trans- lates the NRZ serial data from the MAC unit into differential pair Manchester encoded data on the Coaxial Transceiver Interface (e g Nationals DP8392) transmit pair To perform this operation the NRZ bit stream from the MAC unit is passed through the Manchester encoder block of the ENDEC unit Once the bit stream is encoded it is transmit- ted out differentially to the transmit differential pair through the transmit driver Manchester Decoder During reception from the network the differential receive data from the transceiver (e g the DP8392) is converted from Manchester encoded data into NRZ serial data and a receive clock which are sent to the receive data and clock inputs of the MAC unit To perform this operation the signal once received by the differential receiver is passed to the phase locked loop (PLL) decoder block The PLL decodes the data and generates a data re- ceive clock and a NRZ serial data stream to the MAC unit Special Signals In addition to performing the Manchester encoding and decoding function the ENDEC unit provides control and clocking signals to the MAC unit The ENDEC sends a carrier sense (CRS) signal that indicates to the MAC unit that data is present from the network on the ENDECs receive differential pair The MAC unit is also pro- vided with a collision detection signal (COL) that informs the MAC unit that a collision is taking place somewhere on


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型号：XC4036XL-1BG352C 厂家：XILINX 封装：23 批号：05+ 数量：BGA 说明：


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