Cirrus-logic CS4207 Manuale Utente Scaricare il pdf (Pagina 138)

138 DS880F4

CS4207

7. APPLICATIONS

7.1 HD Audio Interface

7.1.1 Multi-Channel Streams

The CS4207 codec supports multi-channel streams (streams with sample blocks containing more than

two samples), on both inbound and outbound frames. Each of the 5 output converter widgets (DAC1/2/3,

S/PDIF TX 1/2) can be associated with an individual stream, or multiple widgets can be grouped to share

the same stream. A mix of shared and individual streams is also supported. Furthermore, the order in

which channels are assigned to each widget is not constrained by design. However, the following limita-

tions exist and must be avoided:

• a stream cannot contain channels that are not associated with any widget (unused channels), unless

those channels appear last within the stream packet, after all other channels

• the same channel cannot be associated with more than one widget

The same capabilities and limitations exist for the 3 input converter widgets (ADC1/2, S/PDIF RX). The

following table gives some examples of valid and invalid stream formats:

Table 4. Stream Format Examples

The curly brackets { } delineate each stream packet. The letters within curly brackets designate each

channel within that stream packet. For instance the sequence “{A, B, C, D} {E, F}” denotes two streams -

one stream consisting of 4 channels A-D and one stream consisting of 2 channels E-F.

Stream Format DAC1 DAC2 DAC3 SPDO1 SPDO2 comment

{A,B} {C,D} {E,F} {G,H} {I,J} A, B C, D E, F G, H I, J indiv. streams, in-order assignment

{A, B, C, D, E, F, G, H, I, J} A, B C, D E, F G, H I, J shared stream, in-order assignment

{A, B, C, D} {E, F} A, B C, D E, F - - mixed shared and indiv. streams

{A, B} {C, D} - - C, D - A, B indiv. streams, out of order assignment

{A, B, C, D, E, F, G, H, I, J} G, H E, F A, B I, J C, D shared stream, out of order assignment

{A, B, C, D} - - - C, D - invalid: leading unused ch. (A, B)

{A, B, C, D, E, F, G, H, I, J} A, B E, F G, H I, J - invalid: intermittent unused ch. (C, D)

{A, B, C, D, E, F, G, H, I, J} A, B C, D E, F G, H - ok: trailing unused ch. (I, J)

{A, B, C, D} A, B C, D - A, B - invalid: ch. assigned to mult. widgets

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Cirrus-logic CS4207 Manuale Utente Pagina 138