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dCS 904 User Manual Manual for Software Version 1.5x and 1.36
dCS Ltd June 2000
Manual part no: DOC135904 iss 2B2
Page 37
135904ma2b2.pdf file available from website
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Sample Alignment
The dCS 904 aligns samples such that word clock out aligns with AES3 samples
out, the rising edge of word clock aligning with the start of the first illegal code in
the X,Z subframe preamble and the falling edge aligning with the start of the Y
subframe preamble. The scope shots below were taken in Master mode.
Figure 16 – Word Clock and AES3 outputs, 96 kS/s
Figure 17 – Word Clock and AES3 outputs, 44.1 kS/s
When word clock in is used as a sync source, in and out are related as below.
The lower waveform is the output, the upper one is the input. The misalignment
is less than about 40 nsecs. The scope shots below were taken with the unit
sync’d to Word clock in.