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ES9218PC 数据表(PDF) 46 Page - ESS Technology,Inc |
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ES9218PC 数据表(HTML) 46 Page - ESS Technology,Inc |
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46 / 101 page  ES9218P Datasheet December 6, 2018 CONFIDENTIAL ADVANCE INFORMATION 1.8 ESS TECHNOLOGY, INC. 237 South Hillview Drive, Milpitas, CA 95035, USA Tel (408) 643-8800 • Fax (408) 643-8801 46 Register 7: Filter Bandwidth and System Mute (0x07) Bits [7:5] [4] [3] [2:1] [0] Mnemonic filter_shape reserved bypass_osf reserved mute Default 3’b100 1’b0 1’b0 2’b00 1’b0 Bit Mnemonic Description [7:5] filter_shape Selects the type of filter to use during the 8x FIR interpolation phase. • 3’b000: linear phase fast roll-off filter • 3’b001: linear phase slow roll-off filter • 3’b010: minimum phase fast roll-off filter • 3’b011: minimum phase slow roll-off filter • 3’b100: apodizing fast roll-off filter type 1 (default) • 3’b101: apodizing fast roll-off filter type 2 • 3’b110: hybrid fast roll-off filter • 3’b111: brick wall filter [4] reserved [3] bypass_osf Allows the use of an external 8x upsampling filter, bypassing the internal interpolating FIR filter. • 1’b0: uses the built-in oversampling filter (default) • 1’b1: uses an external upsampling filter, which requires data oversampled by 8x externally [2:1] reserved [0] mute Mutes all 2 channels of the ES9218P. • 1’b0: normal operation (default) • 1’b1: mute both channels |
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