ES9028PRO datasheet(16/57 Pages) ESS

16 / 57 page

CONFIDENTIAL INFORMATION v3.6

July 6, 2020

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

user_bits

spdif_ig_data

spdif_ig_valid

reserved

auto_select

input_select

Default

1’b0

2’b11

2’b00

Bit

Mnemonic

Description

[7]

user_bits

Both SPDIF channel status bits and SPDIF user bits are available for readback

via the I2C interface. To reduce register count, the channel status bits and user

bits occupy the same register space. Setting user_bits will present the SPDIF

user bits on the read-only register interface instead of the default channel status

bits.

•

1’b1: presents the SPDIF user bits on the read-only register interface

•

1’b0: presents the SPDIF channel status bits on the read-only register

interface (default)

[6]

spdif_ig_data

Configures the SPDIF decoder to ignore the ‘data’ flag in the channel status bits.

•

1’b1: ignore the data flag in the channel status bits and continue to

process the decoded SPDIF data

•

1’b0: mute the SPDIF data when the data flag is set (default)

Note: Enabling the SPDIF output when data is present could cause undesirable

noise if the SPDIF data is compressed audio or a non-standard format.

[5]

spdif_ig_valid

Configures the SPDIF decoder to ignore the ‘valid’ flag in the SPDIF stream.

•

’b1: ignore the valid flag and continue to process the decoded SPDIF

data

•

1’b0: mute the SPDIF data when the valid flag is invalid (default)

[4]

reserved

[3:2]

auto_select

Allows the SABRE DAC to automatically select between either serial, SPDIF or

DSD input formats.

•

2’b11: automatically select between DSD, SPDIF or serial data (default)

•

2’b10: automatically select between SPDIF or serial data

•

2’b01: automatically select between DSD or serial data

•

2’b00: disable automatic input decoder and instead use the information

provided by register 1[1:0]

[1:0]

input_select

Configures the SABRE DAC to use a particular input decoder if auto_select is

disabled.

•

2’b11: DSD

•

2’b10: reserved

•

2’b01: SPDIF

•

2’b00: serial (default)

Note

: Register 1[3:2] must be set to 2’b00 for input_select to function.

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