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ES1371 Datasheet(PDF) 6 Page - List of Unclassifed Manufacturers |
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ES1371 Datasheet(HTML) 6 Page - List of Unclassifed Manufacturers |
6 / 37 page ENSONIQ Proprietary Information ENSONIQ Proprietary Information ENSONIQ AudioPCI 97 Specification Rev 1.1 Oct 1, 1997 6 4.11. Internal Memory There are two separate sections of memory in AudioPCI 97. One section is allocated as a cache for the playback and record channels and also as a FIFO for the UART. The other section is allocated to the Sample Rate Converter module and is used as a cache for sample rate conversion and also as control register space for the playback and record channels in the sample rate converter. The internal memory for the sound cache in AudioPCI 97 is organized as 4 blocks of 64 bytes each. Each block is divided into 4 pages of 16 bytes each (4 longwords). Memory can be accessed as longwords only. In order to access a specific page of memory the memory page register must first be setup for the specific page to be accessed. The first three blocks of memory contain the 3 circular buffers for the 2 playback channels and the record channel. The last block contains the frame information for the playback and record channels and also includes the UART FIFO. The memory block and page organization is shown below : Block Page Higher Address Lower 0 - DAC 1 0000 DAC1 sample bytes 15 - 0 Lower half buffer 0001 DAC1 sample bytes 31 - 16 0010 DAC1 sample bytes 47 - 32 Upper half buffer 0011 DAC1 sample bytes 63 - 48 1 - DAC2 0100 DAC2 sample bytes 15 - 0 Lower half buffer 0101 DAC2 sample bytes 31 - 16 0110 DAC2 sample bytes 47 - 32 Upper half buffer 0111 DAC2 sample bytes 63 - 48 2 - ADC 1000 ADC sample bytes 15 - 0 Lower half buffer 1001 ADC sample bytes 31 - 16 1010 ADC sample bytes 47 - 32 Upper half buffer 1011 ADC sample bytes 63 - 48 3 - Frame/UART 1100 DAC1, DAC2 frame information (see register descriptions) 1101 ADC frame information (plus 2 open longwords) 1110 UART fifo (only bits 8 - 0 of each longword are used) 1111 UART fifo |
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