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TNETX4090GGP Datasheet(PDF) 68 Page - Texas Instruments |
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TNETX4090GGP Datasheet(HTML) 68 Page - Texas Instruments |
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68 / 78 page ![]() TNETX4090 ThunderSWITCH II™ 9-PORT 100-/1000-MBIT/S ETHERNET™ SWITCH SPWS044E – DECEMBER 1997 – REVISED AUGUST 1999 68 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 RDRAM interface RDRAM (see Figure 24) NO. MIN MAX UNIT 1 tc(DX_CLK) Cycle time DTX_CLK, DRX_CLK 3.33 3.33 ns 2, 3 tw(DX_CLK) Pulse duration, DTX_CLK, DRX_CLK low or high 45% 55% tc(DX_CLK) 4, 5 tw(TICK) Pulse duration, tick time 0.5 0.5 tcycle 6, 8 tsu(DBUS_DATA) Setup time, DBUS_DATA before tick 0.35 ns 7, 9 th(DBUS_DATA) Hold time, DBUS_DATA after tick 0.35 ns 10, 11 td(DBUS_OUT) Delay time, DBUS_DATA, DBUS_CTRL, DBUS_EN from tick 0.635 1.438 tc(DX_CLK) tcycle† Cycle time, internal clock 4 tc(DX_CLK) † Not shown in Figure 24 due to scale DBUS_DATA (in) DTX_CLK DRX_CLK DBUS_CTRL DBUS_EN DBUS_DATA (out) 6 7 8 9 10 11 4 5 2 3 1 Figure 24. RDRAM |
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