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DM9301F Datasheet(PDF) 10 Page - List of Unclassifed Manufacturers |
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DM9301F Datasheet(HTML) 10 Page - List of Unclassifed Manufacturers |
10 / 22 page DM9301 100Mbps Ethernet Fiber/Twisted Pair Single Chip Media Converter 10 Final Version: DM9301-DS-F02 May 8, 2000 Functional Description The DM9301 Fast Ethernet single-chip TX/FX media converter, provides the functionality as specified in IEEE802.3, integrates the complete 100BASE-TX and a PECL optic module interface for 100Base-FX. The DM9301 implements the PCS, PMA, and TP-PMD sublayer functions, as defined by specification. The term “X” will be used to describe the sections used in the fiber PHY layer interface. The term “X” will be used to describe the sections used in the twisted-pair PMD layer interface. 100BASE-FX to TX Operation The block diagram in figure 1 provides an overview of the functional blocks contained in the FX to TX media converter interface. The FX to TX interface includes the following functional blocks: • FX PECL Receiver • FX Receiver Clock Recovery Module • FX NRZI to NRZ Converter • FX Serial to Parallel Converter • FX Code Group Alignment Monitor • TX Scrambler • TX Parallel to Serial Converter • TX NRZ to NRZI Converter • TX NRZI to MLT-3 Converter • TX MLT-3 Driver FX PECL Receiver The PECL receiver receives NRZI encoded, differential Pseudo Emitter Coupled Logic level signal. The receiver converts the receive signal into a single-ended NRZI signal and presents this signal to the FX Clock Recovery Module. FX Receiver Clock Recovery Module The FX Clock Recovery Module accepts NRZI data from the PECL receiver. The FX Clock Recovery Module locks onto the data stream, using a Phase Lock Loop (PLL) and extracts the 125Mhz reference clock. The extracted and synchronized clock and data are presented to the FX NRZI to NRZ Decoder. FX NRZI to NRZ Converter The receive data stream is required to be NRZI encoded for compatibility with the standards for 100Base- FX. This conversion process must be reversed on the transmit end. The FX NRZI to NRZ decoder, receives the NRZI data stream from the FX Clock Recovery Module and converts it to a NRZ data stream to be presented to the FX Serial to Parallel conversion block. CGM 25M OSC/XTAL FX Code- group Alignment Monitor FX Serial to Parallel FX RX CRM TX Scrambler TX Parallel to Serial TX NRZ to NRZI TX NRZI to MLT-3 MLT-3 Driver TPTXO+/- Rise/Fall Time CTL 25M FXRXCLK 125M FXRXCLK FX PECL RCVR PECLRXI +/- FXSD RCVR FX Link Status Monitor PECLSD FX NRZI to NRZ FX to TX Block Diagram Figure 1 |
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