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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ICS1892Y-10 датащи(PDF) 141 Page - Integrated Circuit Systems |
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ICS1892Y-10 датащи(HTML) 141 Page - Integrated Circuit Systems |
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141 / 148 page  Chapter 10 DC and AC Operating Conditions ICS1892, Rev. D, 2/26/01 February 26, 2001 141 ICS1892 © 2000-2001, Integrated Circuit Systems, Inc. All rights reserved. 10.5.18 10Base-T: Heartbeat Timing (SQE) Table 10-25 lists the significant time periods for the 10Base-T heartbeat (that is, the Signal Quality Error, which consists of timings of signals on the TXEN, TXCLK, and COL pins). Figure 10-18 shows the timing diagram for the time periods. Note: 1. For more information on 10Base-T SQE operations, see Section 7.5.10, “10Base-T Operation: SQE Test”. 2. In 10Base-T mode, one bit time = 100 ns. Figure 10-18. 10Base-T Heartbeat (SQE) Timing Diagram Table 10-25. 10Base-T Heartbeat (SQE) Timing Time Period Parameter Conditions Min. Typ. Max. Units t1 COL Heartbeat Assertion Delay from TXEN De-Assertion 10Base-T Half Duplex – 840 1600 ns t2 COL Heartbeat Assertion Duration 10Base-T Half Duplex – 1000 1500 ns TXEN TXCLK COL t2 t1 |
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