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FIN24A Datasheet(PDF) 6 Page - Fairchild Semiconductor |
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FIN24A Datasheet(HTML) 6 Page - Fairchild Semiconductor |
6 / 20 page Preliminary www.fairchildsemi.com 6 Deserializer Operation Mode The operation of the deserializer is only dependent upon the data received on the DSI data signal pair and the CKSI clock signal pair. The following two sections describe the operation of the deserializer under two distinct serializer source conditions. References to the CKREF and STROBE signals refer to the signals associated with the serializer device used in generating the serial data and clock signals that are inputs to the deserializer. When operating in this mode the internal serializer circuitry is disabled including the parallel data input buffers. If there is a CKREF signal provided then the CKSO serial clock will continue to transmit bit clocks. Deserializer Operation: DIRI equals 0 (Serializer Source: CKREF equals STROBE) When the DIRI signal is asserted LOW the device will be configured as a deserializer. Data will be captured on the serial port and deserialized through use of the bit clock sent with the data. The word boundary is defined in the actual clock and data signal. Parallel data will be generated at the time the word boundary is detected. The falling edge of CKP will occur approximately 6 bit times after the falling edge of CKSI. The rising edge of CKP will go high approxi- mately 13 bit times after CKP goes LOW. The rising edge of CKP will be generated approximately 13 bit times later. When no embedded word boundary occurs then no pulse on CKP will be generated and CKP will remain HIGH. Deserializer Operation: DIRI equals 0 (Serializer Source: CKREF does not equal STROBE) The logical operation of the deserializer remains the same regardless of if the CKREF is equal in frequency to the STOBE or at a higher frequency than the STROBE. The actual serial data stream presented to the deserializer will however be different because it will have non-valid data bits sent between words. The duty cycle of CKP will vary based on the ratio of the frequency of the CKREF signal to the STROBE signal. The frequency of the CKP signal will be equal to the STROBE frequency. The falling edge of CKP will occur 6 bit times after the data transition. The LOW time of the CKP signal will be equal to ½ (13 bit times) of the CKREF period. The CKP HIGH time will be equal to STROBE period – ½ of the CKREF period. Figure 5 is representative of a waveform that could be seen when CKREF is not equal to STROBE. If CKREF was signifi- cantly faster then additional non-valid data bits would occur between data words. FIGURE 4. Deserializer Timing Diagram (Serializer Source: CKREF equals STROBE) FIGURE 5. Deserializer Timing Diagram (Serializer Source: CKREF does not equal STROBE) |
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