
dCS Delius
User Manual
Manual for Software Issue 2.3x
dCS
Ltd
September 2004
Manual filename: Delius Manual v2.3x.doc
Page 50
email: [email protected]
English version
web-site: www.dcsltd.co.uk
G
ENERAL
T
ECHNICAL
I
NFORMATION
IEEE 1394 Overview
The IEEE 1394 interface is a high speed multi-channel system. It has the
capacity to carry over 50 channels of DSD (Direct Stream Digital) or over 30
channels of 24 bit / 192kS/s audio data through a single cable.
From October 2001 onwards, a pair of 6-way electrical IEEE 1394 interfaces
running at 200Mbit/s are available on the following
dCS
products:
•
dCS Elgar Plus
DAC, standard fit with software version 4.10 or later.
•
dCS Delius
DAC, optional fit with software version 2.10 or later.
•
dCS Purcell
Upsampler, optional fit with software version 2.11 or later.
•
dCS Verdi
SACD/CD Transport, standard fit.
•
dCS Verdi La Scala
Upsampling SACD/CD Transport, standard fit.
In the current implementation,
Purcell
can upsample standard digital formats
(such as CD at 44.1kS/s 16 bits) to DSD at 2.822MS/s and output a stereo pair
of DSD data onto its 1394 interface.
Verdi
can read DSD data from an SACD
and output a stereo pair of DSD data onto its 1394 interface. The data is
encrypted to conform to the conditions of the DSD licensing arrangements.
Either
Elgar Plus
or
Delius
will accept DSD data from the 1394 interface and
convert it to high quality analogue.
The hardware interface is very flexible and software configurable. We will add
other features and data formats at a later date, adopting industry standard
formats as they stabilise.
Synchronising IEEE 1394 interfaces
The IEEE 1394 system is great for carrying large amounts or digital audio data
– but is inherently very jittery. To ensure low-jitter conversion to analogue, each
unit linked by the 1394 system must be synchronised to the others by another
connection.
•
A DAC in slave mode should be sync’ed to
Verdi
by connecting
Verdi
’s
WClk Out
to the DAC’s
WClk In
.
•
A DAC in master mode should sync
Verdi
by connecting the DAC’s
WClk
Out
to
Verdi
’s
WClk In
.
•
An Upsampler should be slaved to
Verdi
, usually by the selected PCM input
(
AES
or
RCA
).
Automatic Input Selection
From October 2002 onwards, the software on the following products has been
enhanced to automatically select the interface carrying data from
Verdi
:
•
dCS Elgar Plus
DAC, standard fit with software version 4.20 or later.
•
dCS Delius
DAC, optional fit with software version 2.20 or later.
•
dCS Verdi
SACD/CD Transport, standard fit with software version 1.20 or
later.
•
dCS Verdi La Scala
Upsampling SACD/CD Transport, standard fit, with the
Easy Play
menu set to
Verdi
.
The system relies on a 1394 link between
Verdi
and the DAC. The DAC will
automatically change inputs whenever
Verdi
changes layer or starts playing.