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AM79C984 датащи(PDF) 22 Page - Advanced Micro Devices |
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AM79C984 датащи(HTML) 22 Page - Advanced Micro Devices |
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22 / 44 page ![]() P R E L I M I N A R Y 22 Am79C984A Command/Response Timing Figure 6 shows the command/response timing. At the end of a GET command, the eIMR device waits two SCLK cycles and then transmits the response on SO. . Figure 6. Control Get Command/Response Control Commands The following section details the operation of each con- trol commands available in the eIMR device. In all cases, the individual bits in each command are shown with the most-significant bit (bit 7) on the left and the least-significant bit (bit 0) on the right. Table 4 and Table 5 show a summary of default states and a summary of control commands, respectively. Note: Data is transmitted and received on the serial data lines least-significant bit first and most-significant bit last. ST D0 D1 D2 D3 D4 D5 D6 D7 SCLK SI ST D0 D1 D2 D3 D4 D5 D6 D7 SO 20650A-11 20650B-11 Table 4. Summary of Default States after Reset eIMR Programmable Option—S Off AUI Partitioning Algorithm Normal TP Partitioning Algorithm Normal AUI/TP Port Enabled Link Test Enabled Link Pulse Enabled Automatic Receiver Polarity Reversal State of SI at reset Extended Distance Mode Disabled Blink Rate Off Software Override of LEDs Disabled |
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