VS2000 Datasheet, PDF(11/21 Page) List of Unclassifed Manufacturers – Headtracking Multichannel USB Audio Headphone IC / USB DAC

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VS2000 Datasheet, PDF (11/21 Pages) List of Unclassifed Manufacturers – Headtracking Multichannel USB Audio Headphone IC / USB DAC

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VLSI

Solution y

VS2000 PRELIMINARY

VS2000

5. VS2000 FUNCTIONAL BLOCKS

5.2 Digital Section

Two of the regulators provide power supply for the digital section.

IOVDD is used for the level-shifters of the digital I/O and crystal oscillator. The IOVDD regulator output must be

connected to IOVDD1 and IOVDD2 input pins, because they are not connected internally. Proper bypass capacitors

should also be used. After reset the I/O voltage is 1.8 V, and ï¬rmware raises it to 3.3 V.

All other digital is powered from core voltage (CVDD). The core voltage is internally connected, and the CVDD

pin should have a proper bypass capacitors.

Clock

The crystal ampliï¬er uses a crystal connected to XTALI and XTALO. An external logic-level input clock can also

be used. When VS2000 is used with USB, 12 MHz input clock must be used.

An internal phase-locked loop (PLL) generates the internal clock by multiplying the input clock by 1.0Ã, 1.5Ã,

. . . , 4.0Ã. In normal operating mode the clock is 4.0Ã12 MHz = 48 MHz. During USB suspend the PLL is off.

XRESET disables clock buffer and puts the digital section into powerdown mode.

VSDSP4

VSDSP4 is VLSI Solutionâs proprietary digital signal processor with a 32-bit instruction word, two 16-bit data

buses, and both 16-bit and 32/40-bit arithmetic.

IROM, XROM, and YROM contain the ï¬rmware, including the default application. Most of the instruction RAM

and some of the X and Y data RAMâs can be used to customize and extend the functionality.

UART

An asynchronous serial port is used for debugging and special applications. The default speed is 115200 bps. RX

and TX pins can also be used for general-purpose I/O when the UART is not required.

SPI

A synchronous serial port peripheral is used for SPI EEPROM boot, and can be used to access other SPI peripherals

(for example LCD or SED) by using another chip select. The SPI is only used for boot if the XCS pin has a high

level after reset (pull-up resistor attached). These pins can also be used for general-purpose I/O when the SPI is

not required.

The ï¬rmware uses SPI pins SO and SCLK for ultrasound transmitter.

Version 0.3, 2007-09-05

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