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SM5906AF Datasheet(PDF) 21 Page - Nippon Precision Circuits Inc |
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SM5906AF Datasheet(HTML) 21 Page - Nippon Precision Circuits Inc |
21 / 30 page NIPPON PRECISION CIRCUITS-21 SM5906AF Shock-proof mode is the mode that realizes shock- proof operation using external DRAM. Shock-proof mode is invoked by setting MSON=H in microcon- troller command 80H. This mode comprises the following 3 sequences. Shock-proof operation overview – Write sequence 1. Input data from a signal processor IC is read in. 2. Data read in is written to external DRAM in the sequence left-channel, (C2PO), and right-channel. (C2PO) is omitted in CDDA mode. – Read sequence 1. Data written to external DRAM is read out at fs rate (rate 2fs in SVC mode). 2. Data is output in sync with the 24-bit bit clock (ZSCK). – Compare-connect sequence 1. Encoding immediately stops when either external buffer RAM overflows or when a CD read error occurs due to shock vibrations. 2. Then, using microcontroller command 80H, the compare-connect start command is executed and compare-connect sequence starts. 3. Compares data re-read from the CD with the pro- cessed final valid data stored in RAM (confirms its correctness). 4. As soon as the comparison detects conforming data, compare-connect sequence stops and encode sequence re-starts, connecting the data directly behind previous valid data. RAM addresses The SM5906AF uses 4M or 16M DRAMs as exter- nal buffers. Three kinds of addresses are used for external RAM control. WA (write address) RA (read address) VWA (valid write address) Among these, VWA is the write address for con- forming data whose validity has been confirmed. Determination of the correctness of data read from the CD is delayed relative to the write processing, so VWA is always delayed relative to WA. The region available for valid data is the area between VWA-RA. Fig 1. RAM addresses RA WA VWA Valid data area |
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