The VSIO Adapter is a dS–NET peripheral primarily intended
for use with the dScope Series III test and measurement system. It is
an interface adapter which allows bi-directional translation between
the dScope's AES3 output and input, and serial audio multiplex
interfaces (for example I2S) such as are commonly found on digital
audio ICs. The exact timing arrangements of the serial multiplex and
its electrical properties (such as rail voltage) can be freely adjusted
by the user. The VSIO Adapter can transact up to 16 multiplexed
channels on a single wire, or up to eight on each of two wires, or up
to four on each of four wires. Each VSIO output 'slot' (channel) can be
driven from the dScope Signal Generator's A or B channel, or can be
muted; any two VSIO input slots (channels) can be routed to the
dScope's Signal Analyzer. Audio wordlengths between 8 and 24 bits can
be positioned anywhere within a slot length of 8, 16, 24 or 32 bits;
data can be transacted MSB- or LSB-first. Clock polarities and
multipliers can be freely selected; frame clocks can be generated
one-bit-early or single-bit-width if required; sign extension is
supported. Synchronisation can be from the dScope of from the EUT
(either SCK/LRCK or MCK), and EUT rail voltages of 1.8V, 2.5V, 3.3V or
5V (TTL or CMOS threshold) are supported.
VSIO Adapter Control dialogue box
All operating parameters are controlled from within the dScope software
using VSIO Adapter Control dialogue box: (Alternatively, the VSIO Adapter may be controlled from a VBScript.)
As well as carrying out the audio transcoding function, the VSIO also
provides a versatile I2C / SPI control port which can be used to
control component-level devices on the EUT during testing.
The VSIO Adapter is connected to the dScope with two AES3 (XLR) cables,
one for the Generator and one for the Analyzer. If the EUT is to be the
clock master for the Generator, an additional AES11 (XLR) cable is
required for the dScope's Digital Output Reference Sync input. Three
short XLR cables are therefore supplied. Short (20cm) breakout cables
are supplied for connecting the Generator and Analyzer serial audio
multiplexes and the control port of the VSIO Adapter to the EUT. These
are terminated in in-line sockets for 0.025" square PCB posts, although
spring 'hooks' are also provided to clip to IC legs etc. 1m
"twist'n'flat" extension cables are also provided.
The VSIO Adapter is controlled by the dScope using the dS–NET
standard, based on the RS–232 protocol. Up to 64
dS–NET devices can be daisy-chained from the dScope's
dS–NET connector using special dS–NET cables.
dS–NET devices are differentiated by setting different
addresses for each on rear-panel DIP switches. dS–NET devices
are easily controlled from their dedicated dialogue boxes in the dScope
software, or from a VBScript. The VSIO Adapter is configured and
controlled using the dS-NET Setup and VSIO Control dialogue boxes (see
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Prism Media Products Limited; Registered in the UK, Reg. No. 2719511,
Prism Sound Limited; Registered in the UK, Reg. No. 2176912
Registered offices for both companies: The Old School, High Street, Stretham, Cambridgeshire, CB6 3LD, UK