Related Manuals for XMOS XS1-L1
Summary of Contents for XMOS XS1-L1
- Page 1 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. Downloaded from Elcodis.com electronic components distributor...
- Page 2 2/18 1 Introduction The USB Audio 2.0 Reference Design, XS1-L1 Edition (hereafter "the board") is a 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 2.0 high-speed device compliant with release 2.0 of the audio USB...
- Page 3 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 XMOS XTAG2 debug adapter Two push-button switches and two LEDs for programmable use...
- Page 4 4/18 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 signals are connected to an SMSC® USB3318 USB transceiver which provides a ULPI connection to the XS1-L1. On power-up, a pulldown resistor holds the transceiver in reset until the XS1-L1 is ready to begin accepting USB traffic. The USB transceiver reset pin is connected to bit zero of port 32A so this can be controlled by software.
- Page 6 USB Audio 2.0 Reference Design, XS1-L1 Edition Hardware Manual (1.0) 6/18 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.
- Page 7 USB Audio 2.0 Reference Design, XS1-L1 Edition Hardware Manual (1.0) 7/18 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.
- Page 8 1, 2, 6, 10, 14, 17, 18, 19 These pins are not connected. On power on, the XS1-L1 boots from the on-board flash memory. With the XTAG2 connected, the XS1-L1 can be reset and then booted from a program on the host PC. www.xmos.com Downloaded from Elcodis.com...
- Page 9 USB Audio 2.0 Reference Design, XS1-L1 Edition Hardware Manual (1.0) 9/18 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 VBus voltage and the approx 100mV dropout of the LDO + RC pre-filter. A low cost buck switching regulator is used to generate the 1.0V core supply for the XS1-L1. A ferrite bead is used on the +5V VBus input to prevent switching noise propagating down the USB cable.
- Page 11 11.2896MHz 24.576MHz The audio master clock is connected to a 1-bit port of the XS1-L1 so that all of the I outputs are synchronised with it. This also allows the S/PDIF output to be generated from a buffered 1-bit port clocked by the audio master clock input.
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Page 12: Test Points
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 Signal P1I0 CODEC_ADC_DATA P1D0 SPI_MOSI / CODEC_DAC_DATA P1A0 SPI_MISO / CODEC_SCLK... - 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. Port Processor P1A0 SPI_MISO / CODEC_SCLK P1B0 SPI_SS XD10 P1C0...
- Page 14 USB Audio 2.0 Reference Design, XS1-L1 Edition Hardware Manual (1.0) 14/18 15 Schematics www.xmos.com Downloaded from Elcodis.com electronic components distributor...
- Page 15 USB Audio 2.0 Reference Design, XS1-L1 Edition Hardware Manual (1.0) 15/18 www.xmos.com Downloaded from Elcodis.com electronic components distributor...
- Page 16 USB Audio 2.0 Reference Design, XS1-L1 Edition Hardware Manual (1.0) 16/18 www.xmos.com Downloaded from Elcodis.com electronic components distributor...
- Page 17 USB Audio 2.0 Reference Design, XS1-L1 Edition Hardware Manual (1.0) 17/18 www.xmos.com Downloaded from Elcodis.com electronic components distributor...
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Page 18: Related Documents
“Information”) and is providing it to you “AS IS” with no warranty of any kind, express or implied and shall have no liability in relation to its use. XMOS Ltd. makes no representation that the Information, or any particular implementation thereof, is or will be free from any claims of infringement and again, shall have no liability in relation to any such claims.