alc885-gr Realtek Semiconductor Corporation, alc885-gr Datasheet - Page 21
Manufacturer Part Number
7.1+2 Channel High-performance Hda Codec With Content Protection
Realtek Semiconductor Corporation
Outbound Frame – Multiple SDOs
The HDA controller allows two SDO signals to be used to stripe outbound data, completing transmission
in less time to get more bandwidth. If software determines the target codec supports multiple SDO
capability, it enables the ‘Stripe Control’ bit in the controller’s Output Stream Control Register to initiate
a specific stream (Stream ‘A’ in Figure 9) to be transmitted on multiple SDOs. In this case, the MSB of
the data stream is always carried on SDO0, the second bit on SDO1 and so forth.
SDO1 is for transmitting a striped stream. The codec does not support multiple SDOs connected to
To guarantee all codecs can determine their corresponding stream, the command stream is not striped. It
is always transmitted on SDO0, and copied on SDO1.
Striped Stream on Multiple SDOs
7.1+2 Channel High-Performance HDA Codec
With Content Protection