VSIO Digital Serial Interface Adapter Technical Specifications

AUDIO PORTS

NOTE: Generator and Analyzer settings are independent
NOTE: All clock and data signals are subject to a 24.576MHz maximum rate

DATA FORMAT
Slots (channels) per frame (sample period):	16 on one wire 8 on each of two wires 4 or 2 on each of four wires
Slot length:	8, 16, 24 or 32 bits
Audio wordlength:	8..24 bits
Audio alignment:	any position in slot, optional sign extension
Orientation:	MSB or LSB first

ROUTING
Output slots:	all routable from Generator A or B channel, or OFF
Input slots:	any two routable to Analyzer A or B channel

CLOCKING
Sample rates:	32, 44.1, 48, 88.2, 96, 176.4 or 192kHz
Sync source:	dScope, EUT(SCK/LRCK) or EUT(MCK)
SCK and LRCK:	input or output, programmable polarities
LRCK format:	wordclock/one-bit, early/normal
MCK:	input, output or OFF, rate: 64, 128, 192, 256, 384 or 512fs

RAIL VOLTAGE
1.8V, 2.5V, 3.3V, 5V (TTL or CMOS threshold)

CONTROL PORT

BIT RATE
I2C mode:	86.4kbps
SPI mode:	86.4kbps

RAIL VOLTAGE
1.8V, 2.5V, 3.3V, 5V (TTL or CMOS threshold) Note: I2C pins have 3k3 pull-up resistors fitted internally

MAXIMUM RATINGS
NOTE: These ratings apply to both audio and control ports and are those beyond which device damage may occur. Correct operation of the VSIO Adapter is not implied over the entire range of these limits.
Maximum voltage applied to input pins:	-0.5V to selected rail voltage + 0.5V
Minimum load applied to output pins:	0R indefinitely
Maximum forced current at output pins:	10mA

UNIT CONTROL
The dS-NET VSIO Adapter is part of the dS-NET family of peripherals for the dScope Series III and is controlled directly from the dScope Series III.
dScope Software Version	1.11 and later
Connections:	2 x male 9-way D-Sub for dS-NET upstream and downstream connections
Addressing:	The dS-NET address of the device is set by DIP switches on the rear panel.
Number of simultaneous units:	Up to 64 dS-NET devices can be addressed on one bus.
Direct PC Control:	The dS-NET VSIO Adapter can also be controlled directly from a PC using either RS232 or RS485 (selectable by jumpers internally) using the dS-NET protocol.

PHYSICAL
The dS-NET VSIO Adapter is a 1u 19" rack mounting component with removable rack ears and removable feet.
Mains Power inlet:	IEC inlet with integral switch plus voltage selector
Mains Voltage:	100 - 120V AC or 220 - 240V AC at 47 - 63Hz user selectable.
Power consumption:	approx 15W
Weight:	3.5kg net, 5kg packed

Specifications subject to amendment.

ARCHITECTURE

The VSIO Adapter comprises three main sections. All of these are controlled via dS-NET, but in other respects their operation is almost entirely independent. This means that the three parts may be used together or in isolation. The Generator section (at the bottom of the diagram) takes an AES3 audio input from the dScope's Signal Generator (from its XLR Digital Output) and transmits the audio data to the EUT as a serial multiplex. The Analyzer section (above the Generator) takes serial audio multiplex data from the EUT and converts it to AES3 for transmission to the dScope's Signal Analyzer, through its XLR Digital Input. The Control section (top left) is a serial controller for the EUT, which allows the user to send control data and monitor status returns in either I2C or SPI format.