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SPCA751A-P101 Arkusz danych(PDF) 3 Page - List of Unclassifed Manufacturers |
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3 / 13 page Preliminary SPCA751A-P101 3 Function Description The SPCA751A is a single-chip CMOS microprocessor optimized for real-time MPEG audio decoding and speech/audio recording. SPCA751A decodes the encoded MPEG audio data according to the commands passed through the Serial Control/Data I/O Interface by the host processor, the host processor can also check the status of decoding process by the use of this interface. Refer to Programming Guide for command definitions In the digital recorder mode, speech/Audio is sampled at 8Khz by the on-chip ADC into 10-bit digital words, after encoding, the datum is compressed into a data rate of 4.8Kbps or 32Kbps. Decoded audio PCM data are output to external DAC through a programmable normal/I 2S PCM interface, this interface is compliant to most of the common audio DACs. The embedded PLL is capable of providing the 27 MHz system clock derived from a 16.934MHz clock source ! Serial Control/Data I/O Interface The host controller uses this interface to transfer MPEG bit-stream with the SPCA751A and to command the SPCA751A during the recording/decoding process. This interface consists of seven pins: Pin # 12 FCEB2 Frame Decoded Indicator generated by the SPCA751A Pin # 13 FCEB1 Data Request Flag generated by the SPCA751A Pin # 44 SCLK1 Bit Clock controlled by the host processor Pin # 1 DT1 Data from the SPCA751A to the host processor Pin # 2 TFS1 Transmit Frame Synchronization controlled by the host processor Pin # 3 DR1 Data from the host processor to the SPCA751A Pin # 4 RFS1 Receive Frame Synchronization controlled by the host processor " FCEB1 - Data Request Flag The FCEB1 flag generated by the SPCA751A informs the status of the decoding/encoding process. When FCEB1 is high, it indicates that the SPCA751A is ready to receive data/command or to transfer data, the host processor is allowed to start the communication; When FCEB1 is low, the SPCA751A is busy processing internally and no I/O tasks could be taken, the commands sent by the host processor during low FCEB1 are not accepted by the SPCA751A and may cause the SPCA751A run into an unknown state. SPCA 751A FCEB1 FCEB2 SCLK RFS1 TFS1 DR1 DT1 Host Controller |
Podobny numer części - SPCA751A-P101 |
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Podobny opis - SPCA751A-P101 |
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