AD1985 datasheet(32/48 Pages) AD

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AD1985

Rev. A | Page 32 of 48

SPDIF Control Register (Index 0x3A)

Reg.Num.

Name

D15 D14 D13

D12

D11 D10 D9

Default

0x3A

SPDIF Control

SPSR1 SPSR0 L

CC6 CC5 CC4 CC3 CC2 CC1 CC0 PRE COPY AUD PRO 0x2000

functionality and manages bit fields propagated as channel

status (or subframe in the V case). With the exception of V, this

disabled (SPDIF bit in Register 0x2A is 0). This ensures that

control and status information initialize correctly at the

beginning of SPDIF transmission.

PRO

Professional. 1 indicates professional use of channel status, 0 indicates consumer.

AUD

Nonaudio. 1 indicates data is nonPCM format, 0 indicates data is PCM.

COPY

PRE

Pre-emphasis. 1 indicates filter pre-emphasis is 50/15

µs, 0 indicates no pre-emphasis.

CC[6:0]

Category Code. Programmed according to IEC standards, or as appropriate.

Generation Level. Programmed according to IEC standards, or as appropriate.

SPSR[1:0]

SPDIF Transmit Sample Rate.

SPSR[1:0] = 00: Transmit Sample Rate = 44.1 kHz.

SPSR[1:0] = 01: Reserved.

SPSR[1:0] = 10: Transmit Sample Rate = 48 kHz (default).

SPSR[1:0] = 11: Not supported.

Validity. This bit affects the Validity flag (Bit <28> transmitted in each SPDIF L/R subframe) and enables the

SPDIF transmitter to maintain connection during error or mute conditions.

V = 1: Each SPDIF subframe (L+R) has Bit <28> set to 1. This tags both samples as invalid.

V = 0: Each SPDIF subframe (L+R) has Bit <28> set to 0 for valid data and 1 for invalid data (error condition).

Note that when V = 0, asserting the VFORCE bit (D15) in Register 0x2A (Extended Audio Stat/Ctrl) will force

the Validity flag low, marking both samples as valid.

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