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FIN24ACGFX Scheda tecnica(PDF) 5 Page - Fairchild Semiconductor |
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FIN24ACGFX Scheda tecnica(HTML) 5 Page - Fairchild Semiconductor |
5 / 21 page 5 www.fairchildsemi.com is present in the serial bit stream. The operation of the serializer will otherwise remain the same. The exact frequency that the reference clock needs to run at will be dependent upon the stability of the CKREF and STROBE signal. If the source of the CKREF signal implements spread spectrum technology then the maximum frequency of this spread spectrum clock should be used in calculating the ratio of STROBE frequency to the CKREF frequency. Similarly if the STROBE signal has significant cycle-to-cycle variation then the maximum cycle-to-cycle time needs to be factored into the selection of the CKREF frequency. Serializer Operation: (Figure 3) DIRI equals 1 No CKREF A third method of serialization can be done by providing a free running bit clock on the CKSI signal. This mode is enabled by grounding the CKREF signal and driving the DIRI signal HIGH. At power-up the device is configured to accept a serialization clock from CKSI. If a CKREF is received then this device will enable the CKREF serialization mode. The device will remain in this mode even if CKREF is stopped. To re-enable this mode the device must be powered down and then powered back up with a “logic 0” on CKREF. FIGURE 1. Serializer Timing Diagram (CKREF equals STROBE) FIGURE 2. Serializer Timing Diagram (CKREF does not equal STROBE) FIGURE 3. Serializer Timing Diagram Using Provided Bit Clock (No CKREF) |
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