ES9028PRO datasheet(31/57 Pages) ESS

31 / 57 page

July 6, 2020

CONFIDENTIAL INFORMATION v3.6

ES9028PRO 32-Bit HyperStream® II 8-Channel Audio DAC

ESS TECHNOLOGY, INC. 237 South Hillview Drive, Milpitas, CA 95035, USA. Tel (408) 643-

8800 • Fax (408) 643-8801

Bits

[7]

[6:5]

[4]

[3]

[2]

[1]

[0]

Mnemonic

bypass_osf

reserved

filter_length

prog_ext

stage2_even

prog_we

prog_en

Default

1’b0

2’b00

1’b0

Bit

Mnemonic

Description

[7]

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

[6:5]

reserved

[4]

filter_length

Selects the filter length to be used in the first stage oversampling step.

•

1’b0: uses the standard 128-tap first stage filter when in fast roll-

off mode (default)

•

1’b1: uses an extended 256-tap first stage filter at the expense

of disabling oversampling on channels 3-8. This mode should

only be used when in stereo operation and with channel mapping

set appropriately

[3]

prog_ext

Enables programming the extended 256-tap coefficients.

•

1’b0: prog_coeff_addr maps to coefficients 0-127 (default)

•

1’b1: prog_coeff_addr maps to coefficients 128-255

[2]

stage2_eve

Selects the symmetry of the stage 2 oversampling filter.

•

1’b0: Uses a sine symmetric filter (27 coefficients) (default)

•

1’b1: Uses a cosine symmetric filter (28 coefficients)

[1]

prog_we

Enables writing to the programmable coefficient RAM.

•

1’b0: Disables write signal to the coefficient RAM (default)

•

1’b1: Enables write signal to the coefficient RAM

[0]

prog_en

Enables the custom oversampling filter coefficients.

•

1’b0: Uses a built-in filter selected by filter_shape (default)

•

1’b1: Uses the coefficients programmed via prog_coeff_data

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