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PDF ES1371 Data sheet ( Hoja de datos )

Número de pieza ES1371
Descripción ENSONIQ AudioPCI 97 digital controller
Fabricantes ETC 
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ENSONIQ Proprietary Information
ENSONIQ AudioPCI™ 97
ES1371
Specification
1. INTRODUCTION
AudioPCI 97 is the new ENSONIQ AC97 digital controller which provides the next
generation of audio performance to the PC market. AudioPCI 97 is a 5.0 Volt PCI bus
compatible device that enables the ENSONIQ SoundScape PCI solution. AudioPCI 97
along with an AC97 CODEC offer the next generation of audio performance in a PC
while maintaining full legacy compatibility without old ISA bus solutions. Some of the
capabilities of AudioPCI 97 are:
SoundScape WaveTable synthesizer .
Full DOS Game Compatibility
Multiple sample rate support
PCI Bus Master for fast DMA
Sounds are stored in MainDamtaeSmhoereyt.4U.com
Access to Ensoniq’s World Famous Sound Library of over 4000 Sounds
3 Stereo inputs and 3 mono inputs can be mixed into the output stream.
Direct I/O space access of the control registers.
100 Pin PQFP or TQFP
External I2S input
No ISA bus pins required
Fully Compliant with PC97 Power Management specification
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ENSONIQ Proprietary Information
ENSONIQ AudioPCI 97 Specification Rev 1.1 Oct 1, 1997
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ES1371 pdf
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ENSONIQ Proprietary Information
4.8. UART
This block includes both the transmitter and receiver for the AudioPCI 97 MIDI interface. The UART
controller also implements an eight byte FIFO in the internal memory. This FIFO is then accessed through
the HOST interface block.
4.9. Sample Rate Converter
This block receives or sends samples from/to the serial interface block for the playback/record channels.
The Sample Rate converter block converts two variable input rate playback channels to one fixed rate
(48Khz) output channel. It also takes one fixed input rate (48Khz) record channel and converts it to a
variable rate output channel. The channels are programmed by writing several ram locations that are a
function of the input and output rates. The Sample Rate Converter block has it’s own memory section. The
Sample Rate Converter memory is accessible only by the Sample Rate Converter block.
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Sample Rate Converter Flow
Synth & Wave
Channels
4k-48k Stereo
Codec 48K
Codec 48K
Linear
N FIR Interp
Filter
olate Record Data
4k-48k
The first stage consists of expanding the numDbaetraoSfhienpeut4t Usa.mcopmles by an integer number (N), up to a
maximum of 16, and filling in between the samples with zeros. Then the new samples are filtered by a long
1/32 band FIR filter. In practice, the zeros are not multiplied with their corresponding FIR coefficients.
The input samples are fed into an input FIFO and the hardware figures out which FIR coefficient
corresponds to each FIFO sample. The starting coefficient and the spacing between successive coefficients
are calculated by aligning the FIR filter with a virtual FIFO which is the expanded version of the real FIFO.
The coefficient positions also depend on the third stage in the block diagram, the linear interpolator. This
interpolator uses frequency and accumulator registers to interpolate between 2 samples.
4.10. Memory Bus
This pathway is used exclusively to transfer data between the internal sound cache memory and the various
sub-systems. The access priority for this bus is (highest to lowest):
Cache Control block
Host Interface
UART Interface
Serial Interface
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ENSONIQ Proprietary Information
ENSONIQ AudioPCI 97 Specification Rev 1.1 Oct 1, 1997
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ES1371 arduino
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ENSONIQ Proprietary Information
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Cache Line Size
Addressable as Byte
Power on reset value 00H
Bit(s) R/W Name
7:0 R CACHE LINE
SIZE
Data Value
00H
Address 0CH
Configuration Space
Latency Timer
Addressable as byte
Power on reset value xxH
Bit(s) R/W Name
7:3 R/W LATENCY
2:0 R ZERO
Address 0DH
Configuration Space
Data Value
Latency Timer specified in PCI bus clocks.
0H
Header Type
Addressable as byte
Power on reset value 00H
Bit(s) R/W Name
7:0 R HEADER TYPE
Data Value
00H
Address 0EH
Configuration Space
BIST
Addressable as byte
Power on reset value 00H
Bit(s) R/W Name
7:0 R BIST
Data Value
00HDataSheet4U.com
Address 0FH
Configuration Space
Base Address
Addressable as long word
Power on reset value xxxxxxxxH
Bit(s) R/W Name
31:6 R/W BASE ADDRESS
5:1 R ZERO
0 R ONE
Data Value
Variable
00H (address 64 byte aligned)
1H
Address 10H
Configuration Space
Base Address
Addressable as long word
Power on reset value 00000000H
Bit(s) R/W Name
31:0 R Not implemented
Data Value
00000000H
Address 14, 18, 1C, 20, 24H
Configuration Space
Cardbus CIS Pointer
Addressable as long word
Power on reset value 00000000H
Bit(s) R/W Name
31:0 R Not implemented
Data Value
00000000H
Address 28H
Configuration Space
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ENSONIQ Proprietary Information
ENSONIQ AudioPCI 97 Specification Rev 1.1 Oct 1, 1997
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