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AM79C901AVCT Datasheet(PDF) 25 Page - Advanced Micro Devices |
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AM79C901AVCT Datasheet(HTML) 25 Page - Advanced Micro Devices |
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25 / 90 page  Am79C901A 25 PR ELI M IN AR Y Figure 6. TXPKT - TXEN Cleared Figure 7. TXPKT - CLS Asserted TXCLK TXEN TXDAT RXCLK RXCRS RXDAT CLS 22304B-8 Note: Once TXEN is cleared, the last symbol gets encoded and transmitted, the looped-back data is presented back to the MAC, and RXCRS falls. Once RXCRS falls, TXCLK and RXCLK toggle for 96 clocks, after which the system returns to the Idle state. TXCLK TXEN TXDAT RXCLK RXCRS RXDAT CLS Note: CLS will be asserted some time after the preamble and SFD have been clocked in. TXCLK and RXCLK are then clocked until RXCRS drops. TXEN drops about 32 clocks after CLS was asserted. RXCRS and CLS are dropped together after more than 500 clocks (about 120 µs). TXCLK and RXCLK keep toggling for approx- imately another 100 clock cycles, when the system returns to the Idle state. 22304B-9 |
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