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CXD2724AQ-3 Datasheet(PDF) 26 Page - Sony Corporation |
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CXD2724AQ-3 Datasheet(HTML) 26 Page - Sony Corporation |
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26 / 65 page  – 26 – CXD2724AQ-3 7. Coefficient RAM/ROM When the coefficient RAM is selected in microcomputer interface transfer mode, the various application functions can be turned on and off, and the coefficient parameters such as each section's volume and delay time can be set. Coefficient RAM addresses other than those given in these specifications are "don't care". However, the RAM is not cleared entirely when this LSI is reset, so there are no initial values as for the setup register. Be sure to set all of the necessary data; otherwise misoperation may result. (1) Configuration The coefficient RAM and ROM have a capacity of 256 words × 16 bits each. However, the address space for the coefficient data is from 00H to ffH (256 words), so it is not possible to access all of the coefficient RAM and ROM data at the same time. That is to say, of the total 512 words in both the coefficient RAM and ROM, only the specified 256 words can be handled. The coefficient RAM and ROM areas are allocated by setting SQD02 to SQD00 of setup register Field D. Coefficient data transferred via the microcomputer interface is stored only in the coefficient RAM area specified by these bits. (Even if a ROM area address is specified and transfer is performed, the transfer is ignored.) + = ROM RAM ROM RAM c0H ffH 00H bfH 00H bfH c0H ffH Coefficient address space Fig. 7-1. Coefficient Data ROM/RAM Allocation when SQD02 to SQD00 are Set to "010" (Setting Example) The contents of the data transferred to the coefficient RAM area differ for each mode. (See "8. Applications" for the detailed contents.) The RAM area may also differ, so SQD02 to SQD00 must be sent when switching the mode. SQD02 to SQD00 111 100 111 Remarks 00 to ff = Coefficient RAM area 80 to ff = Coefficient RAM area 00 to ff = Coefficient RAM area Mode Pro Logic + simple SFC mode Virtual Dolby Surround mode SFC mode Setting item Table 7-1. Coefficient RAM Area |
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