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TNETX4090GGP 数据表(PDF) 72 Page - Texas Instruments |
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TNETX4090GGP 数据表(HTML) 72 Page - Texas Instruments |
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72 / 78 page ![]() TNETX4090 ThunderSWITCH II™ 9-PORT 100-/1000-MBIT/S ETHERNET™ SWITCH SPWS044E – DECEMBER 1997 – REVISED AUGUST 1999 72 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 LED interface LED (see Figure 29) NO. MIN MAX UNIT 1 tc(LED_CLK) Cycle time, LED_CLK 8 tc 2 tw(LED_CLK) Pulse duration, LED_CLK high 4 tc 3 tn(LED_CLK) Number of LED_CLK pulses in burst 24† 4 tc(BURST) Cycle time, LED_CLK burst 4687488‡ tc 5 tsu(LED_DATA) Setup time, LED_DATA before LED_CLK ↑ 4 tc 6 th(LED_DATA) Hold time, LED_DATA after LED_CLK ↑ 4 tc † During hard reset, LED_CLK runs continuously. ‡ Does not apply during hard reset First LED Second LED Last LED First LED 5 6 2 1 3 4 LED_CLK LED_DATA Figure 29. LED |
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