USB AUDIO 2.0 REFERENCE DESIGN XMOS, USB AUDIO 2.0 REFERENCE DESIGN Datasheet

USB AUDIO 2.0 REFERENCE DESIGN

USB AUDIO 2.0 REFERENCE DESIGN

Manufacturer Part Number
USB AUDIO 2.0 REFERENCE DESIGN
Description
USB AUDIO 2.0 REFERENCE DESIGN
Manufacturer
XMOS

Specifications of USB AUDIO 2.0 REFERENCE DESIGN

Design Resources
USB AUDIO Schematic
Main Purpose
Audio, Audio Processing
Embedded
Yes
Utilized Ic / Part
XS1-L1
Primary Attributes
Audio data up to 24-bit @ 192kHz
Secondary Attributes
I²S and S/PDIF
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
880-1017
USB Audio 2.0 Reference Design, XS1-L1 Edition
Hardware Manual
Version 1.0
Publication Date: 2009/10/05
Copyright
© 2009 XMOS Ltd. All Rights Reserved.

Related parts for USB AUDIO 2.0 REFERENCE DESIGN

USB AUDIO 2.0 REFERENCE DESIGN Summary of contents

Page 1

... USB Audio 2.0 Reference Design, XS1-L1 Edition Hardware Manual Publication Date: 2009/10/05 Copyright © 2009 XMOS Ltd. All Rights Reserved. Version 1.0 ...

Page 2

... USB Audio 2.0 Reference Design, XS1-L1 Edition Hardware Manual (1.0) 1 Introduction The USB Audio 2.0 Reference Design, XS1-L1 Edition (hereafter "the board" hardware reference design for a USB audio interface using the XMOS XS1-L1 event- driven processor. It contains a single XS1-L1 device enabling implementation of a complete USB 2 ...

Page 3

... USB Audio 2.0 Reference Design, XS1-L1 Edition Hardware Manual (1.0) USB endpoints use the asynchronous synchronisation mode to allow an external low jitter audio master clock to be used Optical digital audio output (S/PDIF) Stereo line level audio input and output XMOS XSYS debug header for easy programming/debug from the host using the ...

Page 4

... USB Audio 2.0 Reference Design, XS1-L1 Edition Hardware Manual (1.0) 2 XS1-L1 Device [A] The board is based on a single XS1-L1 device in a 128 pin TQFP package. The XS1-L1 consists of a single XCore, which comprises an event-driven multi- threaded processor with tightly integrated general purpose I/O pins and 64 KBytes of on-chip RAM and 8 KBytes of OTP (One Time Programmable) memory ...

Page 5

... USB Audio 2.0 Reference Design, XS1-L1 Edition Hardware Manual (1.0) 3 USB Connector and Transceiver [B] The board uses a standard USB series B receptacle as its USB connector. The high-speed USB signals are connected to an SMSC® USB3318 USB transceiver which provides a ULPI connection to the XS1-L1. ...

Page 6

... USB Audio 2.0 Reference Design, XS1-L1 Edition Hardware Manual (1.0) These master clock frequencies were chosen due to the easy availability of crystals at these frequencies. The reset pin on the CODEC is mapped to bit 1 of port 32A on the processor. 4.1 Audio IO Two 3.5mm Tip Ring Sleeve (TRS) audio jacks are provided for stereo audio input and output. The layout of the audio jacks is displayed below: A simple passive ac-coupling and low pass fi ...

Page 7

... USB Audio 2.0 Reference Design, XS1-L1 Edition Hardware Manual (1.0) 5 Optical digital output [D] An optical digital audio transmitter is used to provide a digital audio output in IEC60958 consumer mode (S/PDIF) format. The S/PDIF signal is generated from a 1-bit port on the processor as defined in the port map. The data stream from the L1 is reclocked using the external master clock to synchronise the data into the audio clock domain. This is achieved using a simple external D-type fl ...

Page 8

... USB Audio 2.0 Reference Design, XS1-L1 Edition Hardware Manual (1.0) 7 XSYS Interface [G] A standard XMOS XSYS interface is provided to allow host debug of the board via JTAG. An XTAG2 USB debug adapter can be plugged into this port to allow running/debug- ging code, programming the FLASH memory and selection of boot mode. A 20-way ...

Page 9

... USB Audio 2.0 Reference Design, XS1-L1 Edition Hardware Manual (1.0) 8 Push-Button Switches [H] The board provides two push-button switches whose states can be sampled at any time by software. The layout of these switches is shown below: The switches are connected to two 1-bit ports, the mapping of which can be seen in the port map ...

Page 10

... USB Audio 2.0 Reference Design, XS1-L1 Edition Hardware Manual (1.0) 10/18 10 Power The board is a high-power bus-powered USB device. This means all the power used by the board is derived from the nominally +5V VBus supply from the USB connector and that the device will use more than 100mA from the VBus line when configured. ...

Page 11

... USB Audio 2.0 Reference Design, XS1-L1 Edition Hardware Manual (1.0) 11/18 11 Audio Clocking [K] The audio USB endpoints are configured in asynchronous mode. This means that the board acts as the audio clock master and the host as the slave. This has the benefit that a simple crystal oscillator can be used to generate the audio master clock which typically results in lower jitter and consequently higher quality audio ...

Page 12

... USB Audio 2.0 Reference Design, XS1-L1 Edition Hardware Manual (1.0) 12/18 12 Test Points The board provides 18 through-hole test points as defined in the table below: Test Point Port Printed Circuit Board The PCB is a two layer design in a credit card form factor with dimensions 54mm ...

Page 13

... USB Audio 2.0 Reference Design, XS1-L1 Edition Hardware Manual (1.0) 13/18 14 Port Map The table below provides a full description of the port to signal mappings used on the board. Pin 1b 4b XD0 P1A0 XD1 P1B0 XD10 P1C0 XD11 P1D0 XD12 P1E0 XD13 P1F0 XD14 ...

Page 14

... USB Audio 2.0 Reference Design, XS1-L1 Edition Hardware Manual (1.0) 14/18 15 Schematics 1K 10K R1 R4 10K www.xmos.com TP10 ...

Page 15

... USB Audio 2.0 Reference Design, XS1-L1 Edition Hardware Manual (1.0) 15/18 6K8 10K R7 R13 GND GND 2 2 10K R12 4R7 R18 POWER IO 8K06 R6 GND 2 10K R14 USB_VBUS 1K R11 DNP R17 www.xmos.com CONFIG 47K R9 47K R8 ...

Page 16

... USB Audio 2.0 Reference Design, XS1-L1 Edition Hardware Manual (1.0) 16/18 470R R29 470R R28 10K R24 1K R22 10K R25 10K R23 www.xmos.com ...

Page 17

... USB Audio 2.0 Reference Design, XS1-L1 Edition Hardware Manual (1.0) 17/18 10K 10K R35 R36 10U 10U C41 C42 C39 C44 10U 10U 3K3 3K3 R33 R32 47K R34 10K R37 www.xmos.com 6K8 2K7 R31 R38 ...

Page 18

... USB Audio 2.0 Reference Design, XS1-L1 Edition Hardware Manual (1.0) 18/18 16 Related Documents The following documents provide more information on designing with the USB Audio 2.0 Reference Design, XS1-L1 Edition: Programming XC on XMOS Devices: explains how to program XMOS event-driven processor devices using the XC language. ...

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