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TNETX4090GGP 数据表(PDF) 63 Page - Texas Instruments |
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TNETX4090GGP 数据表(HTML) 63 Page - Texas Instruments |
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63 / 78 page ![]() TNETX4090 ThunderSWITCH II™ 9-PORT 100-/1000-MBIT/S ETHERNET™ SWITCH SPWS044E – DECEMBER 1997 – REVISED AUGUST 1999 63 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 transmit PMA transmit (see Figure 17) NO. MIN MAX UNIT 1 tc(Mxx_GTCLK) Cycle time, Mxx_GTCLK 8† 8† ns 2,3 tw(Mxx_GTCLK) Pulse duration, Mxx_GTCLK low or high 40% 60% tc(Mxx_GTCLK) 4 tsu(Mxx_TXD) Setup time, Mxx_RXD7–Mxx_RXD0 valid before Mxx_GTCLK ↑ 2 ns 4 tsu(Mxx_TXEN) Setup time, Mxx_RXDV valid before Mxx_GTCLK ↑ 2 ns 4 tsu(Mxx_TXER) Setup time, Mxx_RXER valid before Mxx_GTCLK ↑ 2 ns 5 th(Mxx_TXD) Hold time, Mxx_RXD7–Mxx_RXD0 valid after Mxx_GTCLK ↑ 1 ns 5 th(Mxx_TXDV) Hold time, Mxx_RXDV valid after Mxx_GTCLK ↑ 1 ns 5 th(Mxx_TXER) Hold time, Mxx_RXER valid after Mxx_GTCLK ↑ 1 ns † ±100-ppm tolerance Transmit Clock Transmit Code Group 1 3 5 4 2 Figure 17. PMA Transmit |
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