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VS2000 preliminary VS2000 VS2000 - headtracking multichannel usb audio headphone ic / usb dac hardware features 2 low-power operation 2 single input voltage: internal voltage regu- lation for analog, digital, and i/o power 2 operates with a single 12 mhz clock 2 internal pll clock multiplier 2 usb full speed hardware 2 i/o for user interface 2 high-quality on-chip stereo dac with no phase error between channels 2 stereo earphone driver capable of driving a 30 load 2 lead-free rohs-compliant package (green) firmware features 2 5.1-channel usb audio device 2 human interface device (hid) buttons C volume decrement C volume increment C pause C play C rewind C fast forward 2 volume controls also work without hid- aware host 2 four room effect levels selected with effect level button 2 tracking on / tracking off / bypass modes selected with power button 2 bass and treble controls through usb au- dio feature unit 2 advanced controls through separate software 2 spi eeprom boot for special applications 2 uart for debugging and special applica- tions description VS2000 is a single-chip multichannel headtrack- ing usb audio ic with audio output to head- phones. VS2000 contains a high-performance low- power dsp core vs dsp 4 , full speed usb port, general purpose i/o pins, spi, uart, as well as a high-quality variable-sample-rate stereo dac, and an earphone ampli?er, and a common voltage buffer. when connected to usb, VS2000 ?rmware con- trols an ultrasound transmitter and reads ultrasound receivers to track the movement of the listeners head. VS2000 then performs real-time spatial pro- cessing to the 5.1 audio channels to position each sound source correctly depending on the head move- ment. an application without headtracking and just with 5.1 audio is also possible. spi eeprom can be used to load code to cus- tomize the system. version 0.3, 2007-09-05 1 vlsi solution y
VS2000 preliminary VS2000 contents contents 1 disclaimer 4 2 de?nitions 4 3 characteristics & speci?cations 4 3.1 absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3.2 recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3.3 analog characteristics of audio outputs . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3.4 analog characteristics of regulators . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3.5 power consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3.6 digital characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4 packages and pin descriptions 7 4.1 packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 4.2 lqfp-48 pin descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 5 VS2000 functional blocks 10 5.1 regulator section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 5.2 digital section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 5.3 analog section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 6 firmware operation 13 6.1 spi boot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 6.2 uart boot/monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 6.3 default firmware features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 6.3.1 usb audio device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 version 0.3, 2007-09-05 2 vlsi solution y
VS2000 preliminary VS2000 list of figures 6.3.2 usb human interface device . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 7 example application 17 7.1 usage hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 8 document version changes 20 8.1 version 0.3, 2007-09-05 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 8.2 version 0.2, 2007-08-31 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 8.3 version 0.1, 2007-06-15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 9 contact information 21 list of figures 1 pin con?guration, lqfp-48. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2 VS2000 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3 VS2000 example application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 4 VS2000 unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 5 VS2000 example schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 version 0.3, 2007-09-05 3 vlsi solution y
VS2000 preliminary VS2000 1. disclaimer 1 disclaimer this is a preliminary datasheet. all properties and ?gures are subject to change. 2 de?nitions b byte, 8 bits. b bit. ki kibi = 2 10 = 1024 (iec 60027-2). mi mebi = 2 20 = 1048576 (iec 60027-2). vs dsp vlsi solutions dsp core. w word. in vs dsp, instruction words are 32-bit and data words are 16-bit wide. 3 characteristics & speci?cations 3.1 absolute maximum ratings parameter symbol min max unit regulator input voltage vhigh -0.3 4.0 v injected current on any pin 50 ma voltage at any digital input -0.3 iovdd+0.3 1 v operating temperature -40 +85 c storage temperature -65 +150 c 1 must not exceed 3.6 v 3.2 recommended operating conditions parameter symbol min typ max unit ambient operating temperature -40 +85 c analog and digital ground 1 agnd dgnd 0.0 v regulator input voltage 3 vhigh avdd+0.3 5.0 5.25 v input clock frequency xtali 12 2 mhz internal clock frequency clki 12 48 48 mhz master clock duty cycle 40 50 60 % 1 must be connected together as close the device as possible for latch-up immunity. 2 to be able to use usb, xtali must be 12 mhz. 3 4.0 v is required for compliant usb level. version 0.3, 2007-09-05 4 vlsi solution y
VS2000 preliminary VS2000 3. characteristics & specifications 3.3 analog characteristics of audio outputs unless otherwise noted: avdd =2.8v, cvdd =2.5v, iovdd=3.3v, ta=-40..+85 c, xtali=12 mhz, internal clock multiplier 4 : 0 . dac tested with full-scale output sinewave, measurement bandwidth 20..20000 hz, analog output load: left to cbuf 30 , right to cbuf 30 . parameter symbol min typ max unit dac resolution 18 bits total harmonic distortion thd 0.1 % dynamic range (dac unmuted, a-weighted) idr 94 db s/n ratio (full scale signal, no load) snr 90 db interchannel isolation (cross talk) 50 75 db interchannel isolation (cross talk), with gbuf 40 db interchannel gain mismatch -0.5 0.5 db frequency response -0.05 0.05 db full scale output voltage (peak-to-peak) 1.3 1.5 1.7 vpp deviation from linear phase 5 analog output load resistance aolr 30 1 analog output load capacitance 100 2 pf cbuf disconnect current (short-circuit protection) 200 ma 1 aolr may be lower than typical , but distortion performance may be compromised. also, there is a maximum current that the internal regulators can provide. 2 cbuf must have external 10 + 47 nf load, left and right must have external 20 + 10 nf load for stability. 3.4 analog characteristics of regulators parameter symbol min typ max unit continuous current, iovdd 50 ma continuous current, cvdd 50 ma continuous current, avdd 100 ma dropout voltages, 30 ma 0.3 v line regulation, vhigh min : : : vhigh max 10 mv load regulation, 1 ma : : : 30 ma 100 mv absolute gain setting accuracy 1 -150 +150 mv gain step setting accuracy -10 +10 % 1 absolute level depends on rcap voltage 3.5 power consumption parameter min typ max unit full operation in example application, v bus = 5 v 75 ma version 0.3, 2007-09-05 5 vlsi solution y
VS2000 preliminary VS2000 3. characteristics & specifications 3.6 digital characteristics parameter symbol min typ max unit high-level input voltage 0 : 7 iovdd iovdd+0.3 1 v low-level input voltage -0.2 0 : 3 iovdd v high-level output voltage at i o = -2.0 ma 0 : 7 iovdd v low-level output voltage at i o = 2.0 ma 0 : 3 iovdd v input leakage current -1.0 1.0 1 a rise time of all output pins, load = 50 pf 50 ns version 0.3, 2007-09-05 6 vlsi solution y
VS2000 preliminary VS2000 4. packages and pin descriptions 4 packages and pin descriptions 4.1 packages lpqfp-48 is lead (pb) free and also rohs compliant package. rohs is a short name of directive 2002/95/ec on the restriction of the use of certain hazardous substances in electrical and electronic equipment . figure 1: pin con?guration, lqfp-48. lqfp-48 package dimensions are at http://www.vlsi.?/ . version 0.3, 2007-09-05 7 1 48 vlsi solution y
VS2000 preliminary VS2000 4. packages and pin descriptions 4.2 lqfp-48 pin descriptions pin name lqfp pin pin type function xreset 1 di active low asynchronous reset, schmitt-trigger input gpio0 0 2 dio general-purpose io port 0, bit 0 gpio0 1 3 dio general-purpose io port 0, bit 1 gpio0 2 4 dio general-purpose io port 0, bit 2 gpio0 3 5 dio general-purpose io port 0, bit 3 dgnd0 6 dgnd core & i/o ground iovdd1 7 iopwr i/o power supply test 8 di test mode input (active high), connect to dgnd gpio0 4 9 dio general-purpose io port 0, bit 4 gpio0 5 10 dio general-purpose io port 0, bit 5 gpio0 6 11 dio general-purpose io port 0, bit 6 gpio0 7 12 dio general-purpose io port 0, bit 7 gpio0 8 13 dio general-purpose io port 0, bit 8 gpio0 9 14 dio general-purpose io port 0, bit 9 gpio0 10 15 dio general-purpose io port 0, bit 10 gpio0 12 16 dio general-purpose io port 0, bit 12 gpio0 13 17 dio general-purpose io port 0, bit 13 dgnd1 18 dgnd core & i/o ground iovdd2 19 iopwr i/o power supply gpio0 11 20 dio general-purpose io port 0, bit 11 gpio0 14 21 dio general-purpose io port 0, bit 14 xcs / gpio1 0 22 dio spi xcs / general-purpose i/o port 1, bit 0 sclk / gpio1 1 23 dio spi clk / general-purpose i/o port 1, bit 1 si / gpio1 2 24 dio spi miso / general-purpose i/o port 1, bit 2 so / gpio1 3 25 dio spi mosi / general-purpose i/o port 1, bit 3 tx / gpio1 4 26 dio uart tx / general-purpose i/o port 1, bit 4 rx / gpio1 5 27 dio uart rx / general-purpose i/o port 1, bit 5 xtali 28 ai crystal input xtalo 29 ao crystal output iovdd 30 iopwr i/o power supply, regulator output dgnd2 31 dgnd core & i/o ground cvdd 32 cpwr core power supply, regulator output vhigh 33 pwr power supply, regulator input avdd 34 apwr analog power supply, regulator output usbp 35 aio usb differential + in / out, controllable 1.5k pull-up usbn 36 aio usb differential - in / out pwrbtn 37 aio power button for regulator startup (and power key) agnd0 38 apwr analog ground avdd1 39 apwr analog power supply right 40 ao right channel output agnd1 41 apwr analog ground agnd2 42 apwr analog ground cbuf 43 ao common voltage buffer for headphones avdd2 44 apwr analog power supply rcap 45 aio filtering capacitance for reference avdd3 46 apwr analog power supply left 47 ao left channel output agnd3 48 apwr analog ground version 0.3, 2007-09-05 8 vlsi solution y
VS2000 preliminary VS2000 4. packages and pin descriptions pin types: type description di digital input, cmos input pad do digital output, cmos input pad dio digital input/output ai analog input ao analog output type description aio analog input/output apwr analog power supply pin dgnd core or i/o ground pin cpwr core power supply pin iopwr i/o power supply pin version 0.3, 2007-09-05 9 vlsi solution y
VS2000 preliminary VS2000 5. VS2000 functional blocks 5 VS2000 functional blocks figure 2: VS2000 block diagram 5.1 regulator section the vhigh pin in the regulator section is used as a common main power supply for voltage regulation. this input is connected to three internal regulators, which are activated when the pwrbtn pin is set high for about one millisecond, so that avdd starts to rise and reaches about 1.5 v. after the pwrbtn has given this initial start current, the regulators reach their default voltages even if the pwrbtn is released. vhigh must be suf?ciently (about 0.3 v) above the highest regulated power (normally avdd) so that regulation can be properly performed. the pwrbtn state can also be read by software, so it can be used as one of the user interface buttons. a power-on reset monitors the core voltage and asserts reset if cvdd drops below 1.6 v. it is also possible to force a reset by keeping pwrbtn pressed for longer than approximately 5.6 seconds. a watchdog counter and the xreset pin can also generate a reset for the device. resets do not cause the regulators to shut down, but they restore the default regulator voltages. after boot the ?rmware and user software can change the voltages. return to power-off is possible only with active software control (vsdsp writes the regulator shutdown bit), or when vhigh voltage is removed for a suf?ciently long time. in the default ?rmware player the power button has to be pressed for 2 seconds to make the software powerdown the system and turn the regulators off. version 0.3, 2007-09-05 10 reference regulator regulator regulator commonvoltage driver voltagemonitor stereoearphone driver stereodac avdd1avdd2 avdd3 serialdata/ control interface uart clock nandflash interface/ general io <1.6v usb x ram x rom y ram y rom i ram i rom vsdsp4processor usbp uspn xcs/gpio1[0] sclk/gpio1[1] si/gpio1[2] so/gpio1[3] rx/gpio1[5] tx/gpio1[4] xtalo xtali data/ gpio0[0...7] control/ gpio0[8...14] xreset test iovddavdd cvdd iovdd1iovdd2 pwrbtn vhigh rcap cbuf right left reset 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 ?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 ampli?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 1.0 , 1.5 , . . . , 4.0 . in normal operating mode the clock is 4.0 12 mhz = 48 mhz. during usb suspend the pll is off. xreset disables clock buffer and puts the digital section into powerdown mode. vsdsp 4 vsdsp 4 is vlsi solutions 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 ?rmware, including the default application. most of the instruction ram and some of the x and y data rams 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 ?rmware uses spi pins so and sclk for ultrasound transmitter. version 0.3, 2007-09-05 11 vlsi solution y
VS2000 preliminary VS2000 5. VS2000 functional blocks usb the usb peripheral handles usb 1.1 full speed harware protocol. low speed communication is not supported, but is correctly ignored. the usbp pin has a software-controllable 1.5k pull-up. a control endpoint (1 in and 1 out) and upto 6 other endpoints (3 in and 3 out) can be used simultaneously. bulk, interrupt, and isochronous transfer modes are selectable for each endpoint. usb receive from usb host to device (out) uses a 2 kib buffer, thus allowing very high transfer speeds. usb transmit from device to usb host (in) also uses a 2 kib buffer and allows all in endpoints to be ready to transmit simultaneously. double-buffering is also possible, but not usually required. the ?rmware uses the usb peripheral to implement a 6-channel usb audio device and usb human interface device. 5.3 analog section the third regulator provides power for the analog section. the analog section consists of digital to analog converters and earphone driver. this includes a buffered common voltage generator (cbuf, around 1.2 v) that can be used as a virtual ground for headphones. the avdd regulator output pin must be connected to avdd1..avdd3 pins with proper bypass capacitors, be- cause they are not connected internally. the usb pins use the internal avdd voltage, and the ?rmware con?gures avdd to 3.6 v when usb is attached. low avdd voltage can be monitored by software. currently the ?rmware does not take advantage of this feature. cbuf contains a short-circuit protection. it disconnects the cbuf driver if pin is shorted to ground. in practise this only happens with external power regulation, because there is a limit to how much power the internal regulators can provide. version 0.3, 2007-09-05 12 vlsi solution y
VS2000 preliminary VS2000 6. firmware operation 6 firmware operation the ?rmware uses the following pins (see the example schematics in section 7): pin description vhigh vbus with diode to vhigh pwrbtn power button starts regulator + vbus-triggered (mode select) usbn external 1 m pull-up usbp external 1 m pull-up gpio0 0 external 1 m pull-down resistor, key 1 connects a 100 k pull-up resistor (vol-) gpio0 1 external 1 m pull-down resistor, key 2 connects a 100 k pull-up resistor (vol+) gpio0 2 external 1 m pull-down resistor, key 3 connects a 100 k pull-up resistor (pause) gpio0 3 external 1 m pull-down resistor, key 4 connects a 100 k pull-up resistor (play) gpio0 4 external 1 m pull-down resistor, key 5 connects a 100 k pull-up resistor (rewind) gpio0 5 external 1 m pull-down resistor, key 6 connects a 100 k pull-up resistor (fast forward) gpio0 6 external 1 m pull-down resistor, key 7 connects a 100 k pull-up resistor (effect level select) gpio0 7 external 100 k pull-up resistor gpio0 8 usb led - red gpio0 9 effect level led - green (pwm-controlled) gpio0 10 tracking led - red gpio0 11 tracking led - green gpio0 12 headtracker input right gpio0 13 headtracker input left gpio0 14 audio led, external power control, with 1 m pull-down resistor gpio1 0 / xcs external pull-up to enable spi eeprom boot gpio1 1 / sclk 820 hz headtracker transmit / spi eeprom sclk gpio1 2 / si spi eeprom miso gpio1 3 / so 40 khz headtracker transmit / spi eeprom mosi gpio1 4 / tx uart transmit gpio1 5 / rx uart receive tracking leds indicate the operation mode: green on tracking on, red on if tracking error is detected green off, red off tracking off, spatial processing active green off, red on bypass mode, no spatial processing, down-mixing only usb led is lit when setup packets are received, i.e. during device con?guration, and when audio controls are changed. audio led is lit when audio data is transferred and is turned off after a short timeout when audio transmission stops. version 0.3, 2007-09-05 13 vlsi solution y
VS2000 preliminary VS2000 6. firmware operation 6.1 spi boot the ?rst boot method is spi eeprom. if gpio1[0] is low after reset, spi boot is skipped. if gpio1[0] is high, it is assumed to have a pull-up resistor and spi boot is tried. first the ?rst four bytes of the spi eeprom are read using 16-bit address. if the bytes are vlsi, a 16-bit eeprom is assumed and the boot continues. if the last 3 bytes are read as vls, a 24-bit eeprom is assumed and boot continues in 24-bit mode. both 16-bit and 24-bit eeprom should have the vlsi string starting at address 0, and the rest of the boot data starting at address 4. if the identi?cation is not found, spi eeprom boot is skipped. boot records are read from eeprom until an execute record is reached. unknown records are skipped using the data length ?eld. byte description 0 type 0=i-mem 1=x-mem 2=y-mem 3=execute 1,2 data len lo, hi C data length in bytes 3, 4 address lo, hi C record address 5.. data* 6.2 uart boot/monitor when byte 0xef is sent to rx at 115200 bps, the ?rmware enters monitor mode and communicates with vs3emu . memory contents can be displayed, executables can be loaded and run, or the ?rmware code can be restarted or continued. the uart is also a convenient way to program or reprogram the spi eeprom. version 0.3, 2007-09-05 14 vlsi solution y
VS2000 preliminary VS2000 6. firmware operation 6.3 default firmware features when usb cable insertion is detected by the ?rmware, usb handling code is started. the internal clock is con?gured to 4.0 12 mhz = 48 mhz, the analog power is con?gured to 3.6 v, the core power to 2.5 v, the usb peripheral is initialized, and the usb pull-up resistor is enabled. in addition to the power button, upto 7 keys are connected to gpio0[6..0] so that they connect a 100 k pull-up to the i/o when the button is pressed, and 1 m pull-downs keep the lines low otherwise. some of the keys are used for different direct modes, the rest are available to pc through usb human interface device. 6.3.1 usb audio device VS2000 appears as an usb composite device with usb audio device and usb human interface device. the usb audio device has 6 16-bit channels, and a feature unit that includes master volume, master mute, master bass, and master treble controls. these controls can be changed using system tools (in windows using the volume control panel and advanced audio settings). headtracker transmit is only enabled when audio transmission is active. 6.3.2 usb human interface device the usb human interface device (hid) transmits information about the state of the device buttons to the host machine. with proper software hid can also be used for reading and writing VS2000 memory, for example monitoring the headtracker state, and changing some advanced features. volume decrement, volume increment volume can be turned up or down with 0.5 db steps using the volume buttons. a short press changes the volume by 0.5 db, a long press will change the volume by approximately 8 db every second. using the volume buttons is always possible, regardless of whether the host machine supports usb human interface devices or not. if the host machine supports usb human interface devices, it can detect the press of volume buttons and set the volume using the usb audio device controls. pause, play, rewind, fast forward these buttons are human interface device buttons only. their operation depends on the host machine, and the application that is active at the time. power button a press of the power button turns on the system. insertion of the device to the usb port can also turn the unit on. a long press (2 seconds) of the power button will turn off the device. short press of the power button switches the processing mode between tracking on, tracking off, and bypass. version 0.3, 2007-09-05 15 vlsi solution y
VS2000 preliminary VS2000 6. firmware operation in both tracking modes the full 3d processing is active. in the bypass-mode the 3d processing is replaced by a simple 6-channel to 2-channel matrixing operation. the power button is not a human interface device button. effect level button the effect level button selects between four prede?ned levels of room response. the default levels are off , low , medium , and high . the default setting is the medium level. the effect level button is not a human interface device button. version 0.3, 2007-09-05 16 vlsi solution y
VS2000 preliminary VS2000 7. example application 7 example application figure 3: VS2000 example application the example application consists of ?ve parts. 1. VS2000 unit - contains the VS2000 chip and other active electronics, buttons and leds. 2. transmitter - ultrasound transmitter element, is powered and controlled by VS2000 unit. 3. sensors - ultrasound receivers, are read by VS2000 unit. 4. usb - the audio source. usb also powers the system. 5. headphones - for audio output. figure 4: VS2000 unit version 0.3, 2007-09-05 17 vlsi solution y
VS2000 preliminary VS2000 7. example application figure 5: VS2000 example schematic version 0.3, 2007-09-05 18 vlsi solution y
VS2000 preliminary VS2000 7. example application 7.1 usage hints linux mplayer requires the following options to play the 6-channel audio instead of 2-channel: -channels 6 -af channels=6:6:0:0:1:1:2:4:3:5:4:2:5:3 . the ?rst option selects six channels, and the second option corrects the channel mapping. mplayer does not determine the output channel mapping automatically. also an option like -ao alsa:device=hw=1.0 may be needed to select the usb audio device in case the system has multiple audio devices. mac the mac system player seems to only play the two-channel mix of a dvd, and can not be con?gured for multi- channel sound, as far as we could determine. mplayer requires the following options to play the 6-channel audio instead of 2-channel: -channels 6 -af channels=6:6:0:0:1:1:2:4:3:5:4:2:5:3 . the ?rst option selects six channels, and the second option corrects the channel mapping. mplayer does not determine the output channel mapping automatically. windows 2000pro, xp, vista windows mediaplayer should play all the channels and it also processes the channel order information, thus plays the channels in the right order. some old third-party dvd player applications only play 2-channel audio. version 0.3, 2007-09-05 19 vlsi solution y
VS2000 preliminary VS2000 8. document version changes 8 document version changes this chapter describes the most important changes to this document. 8.1 version 0.3, 2007-09-05 2 example application picture and board photo added. 2 first public release. 8.2 version 0.2, 2007-08-31 2 headtracker left and right swapped. 2 example schematic and pictures updated. 2 usage hints chapter added. 8.3 version 0.1, 2007-06-15 2 first pre-release version. version 0.3, 2007-09-05 20 vlsi solution y
VS2000 preliminary VS2000 9. contact information 9 contact information vlsi solution oy entrance g, 2nd ?oor hermiankatu 8 fin-33720 tampere finland fax: +358-3-3140-8288 phone: +358-3-3140-8200 email: sales@vlsi.? url: http://www.vlsi.?/ version 0.3, 2007-09-05 21 vlsi solution y

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