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DS31256 数据表(PDF) 152 Page - Maxim Integrated Products |
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DS31256 数据表(HTML) 152 Page - Maxim Integrated Products |
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152 / 183 page ![]() DS31256 256-Channel, High-Throughput HDLC Controller 152 of 183 Figure 11-4. Local Bus Access Flowchart PCI Host Initiates a Local Bus Access Is Arbitration Enabled for the Local Bus? Is the Local Bus Granted? Is the External Local Bus Ready ( LRDY) Being Used? Normal Access Occurs Local Bus Access Progresses Local Bus Access Progresses Timer Expired? LRDY Active? Start 9 Clock Timer Set the LBE Status Bit No Yes Yes No No No Yes Yes No Yes PCI Target Retry Issued Are there 16 Clocks Remaining? No Yes Request the Bus |
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