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GL9714 Datasheet(PDF) 23 Page - GENESYS LOGIC |
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GL9714 Datasheet(HTML) 23 Page - GENESYS LOGIC |
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23 / 46 page ![]() GL9714 PCI Express TM PIPE x4 PHY ©2004-2007 Genesys Logic Inc. - All rights reserved. Page 23 Two unique bus situations define a message START and STOP condition. 1. A HIGH to Low transition of the SMBDAT line while SMBCLK is HIGH indicates a message START condition. 2. A LOW to HIGH transition of the SMBDAT line while SMBCLK is HIGH defines a message STOP condition. Figure 4.3 – START and STOP Condition Every byte consists of 8 bits. Each byte transferred on the bus must be followed by an acknowledge bit. Bytes are transferred with the most significant bit (MSB) first. Fig. 4.4 illustrates the positioning of acknowledge (ACK) and not acknowledge (NACK) pulses relative to other data. Figure 4.4 – ACK and NACK Signaling of SMBus |
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