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ICS1890 Datasheet(PDF) 15 Page - Integrated Circuit Systems |
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ICS1890 Datasheet(HTML) 15 Page - Integrated Circuit Systems |
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15 / 42 page  15 ICS1890 10Base-T Block Diagram 10Base-T Manchester Encoder/Decoder When the ICS1890 is operating in the 10Base-T mode, Manchester coding is used. When transmitting, nibbles from the MII are converted to a serial bit stream and then Manchester en-coded. When receiving, the Manchester encoded bit stream is decoded and converted to nibbles for presentation to the MII. Clock Synthesis A 2.5 MHz clock is synthesized for nibble wide transactions. A 10 MHz clock is synthesized for serial transactions. Clock Recovery The PLL synchronizes on the MAC frame preamble and then begins recovering data normally. Idle Function The Idle function is used to keep a 10Base-T link alive in the absence of data transmission. If no data traffic is transmitted for 16ms, a link pulse will be transmitted. Link pulse transmission will continue every 16ms until real data is transmitted. Link Monitor This function is used to qualify a 10Base-T link. If neither data or a Link Pulse is received for 50 to 150ms, then the link is considered down. This state is exited after data is received or 3 to 10 Link Pulses are received. |
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