ES1371 Datasheet, PDF (27/37 Pages) List of Unclassifed Manufacturers – ENSONIQ AudioPCI 97 digital controller

ENSONIQ Proprietary Information
7.8. Host Interface - Memory
The top 64 bytes of memory are actually used as register storage for the CCB block and also as the FIFO
for the UART block. The CCB registers are located in the lower 32 bytes of this block and require six
longwords. These registers control filling the circular buffers for the two playback channels and the record
channel. Each channel requires 2 longwords. The UART FIFO is located in the upper 32 bytes of this block
and requires all eight longwords but uses only 9 bits of each longword.
DAC1 Frame Register 1
Addressable as longword
Power on reset value xxxxxxxxH
Bit(s) R/W Name
31:0 R/W PCI ADDRESS
Address 30H
Memory Page 1100b
Direct Mapped
Function
This longword is the physical PCI address of DAC1 sample buffer
in system memory
DAC1 Frame Register 2
Addressable as longword
Power on reset value xxxxxxxxH
Bit(s) R/W Name
31:16 R/W Current Count
15:0 R/W Buffer Size
Address 34H
Memory Page 1100b
Direct Mapped
Function
This 16 bit counter indicates the number of longwords that have
been transferred.
This 16 bit value indicates the number of longwords in a buffer
minus one.
DAC2 Frame Register 1
Addressable as longword
Power on reset value xxxxxxxxH
Bit(s) R/W Name
31:0 R/W PCI ADDRESS
Address 38H
Memory Page 1100b
Direct Mapped
Function
This longword is the physical PCI address of DAC2 sample buffer
in system memory
DAC2 Frame Register 2
Addressable as longword
Power on reset value xxxxxxxxH
Bit(s) R/W Name
31:16 R/W Current Count
15:0 R/W Buffer Size
Address 3CH
Memory Page 1100b
Direct Mapped
Function
This 16 bit counter indicates the number of longwords that have
been transferred.
This 16 bit value indicates the number of longwords in a buffer
minus one.
ENSONIQ Proprietary Information
ENSONIQ AudioPCI 97 Specification Rev 1.1 Oct 1, 1997
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