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YMF754-R 数据表(PDF) 24 Page - YAMAHA CORPORATION |
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YMF754-R 数据表(HTML) 24 Page - YAMAHA CORPORATION |
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24 / 60 page ![]() YMF754 June 28, 1999 -24- 4C-4Dh: D-DMA Slave Configuration Read / Write Default: 0000h Access Bus Width: 8, 16, 32-bit b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0 Base Address EA TS CE b0................CE: Channel Enable This bit enables the Distributed DMA function. “0”: Disable Distributed DMA (default) “1”: Enable Distributed DMA b[2:1] ..........TS: Transfer Size (Read Only) These bits indicate the size of the DMA transfer. Since DS-1E supports only 8-bit DMA transfer, the bits are hardwired to 00b. b3................EA: Extended Address (Read Only) DS-1E does not support extended address mode. This bit is hardwired to 0b. b[15:4] ........Base Address : D-DMA Slave Base Address These bits indicate the D-DMA slave base address. 4E-4Fh: DS-1E Power Control 2 Read / Write Default: 0000h Access Bus Width: 8, 16, 32-bit b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0 - - - PSHWV PSIO PSACL PSDIR PSDIT PSZV PSSRC PSPCA PSJOY PSMPU PSSB PSFM CMCD b0................CMCD: CODEC Master Clock Disable Setting this bit to “1” disables the oscillation of the CMCLK. To stop a clock, when the CMCLK is supplied to the AC’97, it is required that b13:PR5 bit of 4A-4Bh register is set to “1”. (If the Secondary AC’97 is used, it is also necessary that b5:SPR5 bit of 5A-5Bh register is set to “1”.) “0”: Normal (default) “1”: Disable b1................PSFM: Power Save FM Synthesizer Setting this bit to “1” stops a clock supplied to the FM synthesizer block. “0”: Normal (default) “1”: Disable b2................PSSB: Power Save Sound Blaster Setting this bit to “1” stops a clock supplied to the Sound Blaster block. “0”: Normal (default) “1”: Disable |
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