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TNETX4090GGP Datasheet(PDF) 67 Page - Texas Instruments |
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TNETX4090GGP Datasheet(HTML) 67 Page - Texas Instruments |
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67 / 78 page ![]() TNETX4090 ThunderSWITCH II™ 9-PORT 100-/1000-MBIT/S ETHERNET™ SWITCH SPWS044E – DECEMBER 1997 – REVISED AUGUST 1999 67 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 MII transmit (see Figure 22) NO. MIN MAX UNIT 1 td(Mxx_TXD) Delay time, from Mxx_TCLK ↑ to Mxx_TXD3–MxxTXD0 valid 5 15 ns 1 td(Mxx_TXEN) Delay time, from Mxx_TCLK ↑ to Mxx_TXEN valid 5 15 ns 1 td(Mxx_TXER) Delay time, from Mxx_TCLK ↑ to Mxx_TXER valid 5 15 ns Mxx_TXD3–Mxx_TXD0 Mxx_TXEN Mxx_TXER 1 Mxx_TCLK Figure 22. MII Transmit MII clock (see Figure 23) NO. MIN MAX UNIT 1 tr(Mxx_CLK) Pulse width low Mxx_RCLK, Mxx_TCLK 35% 65% 2 th(Mxx_CLK) Pulse width high Mxx_RCLK, Mxx_TCLK 35% 65% 3 tw(Mxx_CLK) Cycle time Mxx_RCLK, Mxx_TCLK 2.5 25 MHz Mxx_RCLK Mxx_TCLK 1 2 3 Figure 23. MII Clock |
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