dCS 900E / 902E User Manual Manual for Software Versions 1.3x to 1.5x
dCS Ltd 12
th
June 2000
Manual part no: DOC0029021E1 Page 45 Document No: OS-MA-D0002-902.1E1
Contact dCS on + 44 1799 531 999 email to: more@dcsltd.co.uk
(inside the UK replace + 44 with 0) web site: www.dcsltd.co.uk
SPDIF
Message Handling -
The SPDIF interface (sometimes known as the Consumer AES/EBU interface)
transmits a data structure that conforms to the IEC 958
9
standard. Like the
AES/EBU, this contains 28 bits of Manchester encoded data, and a 4 bit near-
Manchester encoded preamble in a subframe, and subframes are further
assembled in a block and frame structure. The difference lies only in the
voltage levels, and the Channel Status bits (the System Message). It contains
24 bits of audio data.
IMPORTANT! The AES/EBU interface and the SPDIF interface have similar data
structures, although the messages are completely different. The two
structures are identified in the data domain by the use of the
Consumer/Professional bit (bit 1 in the message). A "1" indicates AES/EBU
format, a "0" indicates SPDIF format.
The default SPDIF message attached to the output data by the unit before being
changed by the user is as follows:
Professional: Off
Non-Audio: Off
Copy Permit: On
Format: 2-Channel General Format
9
See EN 60958:1995 or IEC958:1989 with amendments 1 & 2. The structure of the message is sufficiently
complex that it is best to read the source material.
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