miniDIGI User Manual
Contents
1. each way For future expansion or linking to another device the miniDIGI was also configured to loop back mode to output the de jittered SPDIF signal to another device Please see the note below about miniDIGI loop back mode In a very similar configuration as above setup but this time two miniDIGI boards are linked up together with an SPDIF link With this creative configuration a single miniDSP is able to power 2 miniAMP miniDIGI configurations for a truly digital solution Template Jumper configuration miniDIGI 1 SPDIF in gt 12S_Data_IN_ch7 amp 8 miniDIGI 1 I2S_Data_OUT_ch38 amp 4 gt SPDIF OUT miniDSP 1 Slave Clock configured for 12S source in plug in miniAMP 1 12S_Data_OUT_ch1 amp 2 miniDIGI 2 Loop back mode Jumper I2S_Data_OUT_ch7 amp 8 miniAMP 2 I2S_Data_OUT_ch7 amp 8 Please see the note below the loop back mode Finally this stereo 4 way configuration displays a Left amp Right active speaker configuration where 4ch amplifiers or miniAMP modules may be used to build an all digital configuration Template Jumper configuration miniDIGI 1 SPDIF in gt 12S_Data_IN_ch7 amp 8 miniDIGI 1 Loop back for un processed audio to SPDIF out miniDSP 1 Slave Clock configured for 12S source in plug in miniAMP 1 I2S_Data_OUT_ch1 amp 2 I2S_Data_OUT_ch3 amp 4 miniDIGI 2 SPDIF in gt 12S_Data_IN_ch7 amp 8 miniDSP 2 Slave Clock configured for 12S source in plug in miniAMP 2 I22. of the first board will need to be delayed by 2 88ms to make sure audio is correctly time aligned miniDSP 2 miniDIGI 2 miniDIGI may be configured in a multitude of ways and the following configurations are only some illustrations of the board s potential Option 1 Quick configuration To simplify your task summarized jumper charts can be downloaded from the Download section of our website o 2 way configuration jumper charts o 3 4way configuration jumper charts Option 2 Advanced configuration For those of you who want to understand more about what they are doing the following board stacking configuration will illustrate some typical jumper configurations Stereo 2 Way configuration gt Digital signal N 2 Analog signal a z o miniDSP To 3 gt amplifier N S o SPDIF Pee SPDIF Toslink Toslink miniDIGl Un Processed signal Option Stereo 2 Way configuration To gt Speakers miniAMP To A sets miniAMP 1 SPDIF Toslink Stereo 4 Way configuration LEFT RIGHT miniDIGI miniDIGI 1 2 SPDIF SPDIF Toslink Toslink 4 ch Amplifier In this stereo 2way configuration Audio comes from the SPDIF input on the miniDIGI board miniDIGI 12S audio SPDIF input was routed to 12S_Data_IN_ch7 amp 8 by placing the jumper in the correct location Jumper location 0 The Analog outputs of the miniDSP are being sent to a multi channel amplifier for
3. 2 Toslink 1 2 Select one of the inputs M M SPDIF 1 SPDIF 2 Toslink 1 Toslink 2 Break Before Make Zoomed up with jumpers i switching 1 3 miniDIGI Power options miniDIGI boards may receive power from multiple ways o In a stacked configuration from another miniDSP board powered by USB o In a stacked configuration from another miniDSP or miniAMP powered by DC supply o Locally a DC connector can be soldered to the board with an external supply ranging from 4 5 to 24VDC 2 12S jumper configuration Configuration flexibility is a core design feature of the miniDSP concept Using the 12S Inter IC Sound protocol synchronized data is shared between between boards Besides the advantages of better noise immunity vs analog audio the choice of the widely known 2S protocol allows design amp customization freedom 12S protocol consists of the following signals Clocks They provides synchronization between ICs 12S_IN 12S input data lines carrying 2 x 24bit audio channels in sync with the clocks 12S OUT 12S output data lines carrying 2 x 24bit audio channels in sync with the clocks Looking at the typical audio flow diagram of a miniDIGI board helps understand the system better INPUTS 2 3 4 5 OUTPUTS Source Digital Sample 12S header Digital gt SPDIF 1 SPDIF I 2 selection Audio Rate Source Audio Beeline 2 header Receiver Converter Selection Transmitter __ Tosl
4. S_Data_OUT_ch1 amp 2 12S_Data_OUT_ch3 amp 4 miinid sp Digital Analog source selection via toggle switch Control of I2S vs Analog source selection is performed from a radio button inside the miniDSP plug in read miniDSP user manual for more information Using the 12S data lines it s however possible to toggle between the Analog inputs of the miniDSP and Digital inputs of the miniDIGI with the following work around Here are the steps to follow Configure the miniDSP plug in to 12S input On all miniDSP plug ins this means that audio needs to be fed to I25_DATA_IN7 amp 8 pins for processing by the miniDSP Knowing that the un processed signal from the ADC of a miniDSP is also available on I2S_DATA_IN5 amp 6 we can toggle between analog from the ADC on miniDSP and Digital from the miniDIGI with a toggle switch located as below diagram Toggle Switch w N o w N o Note that toggling between 2 modes should either be done with power OFF or using Brake before Make switches to prevent any potential short circuits inmid sp Troubleshooting The following symptoms were found to be the most likely cause of issues Item Symptoms Troubleshooting recommendation If not solved go to item 1 No audio on outputs Check your jumper configuration carefully Contact us 12S source selection 12S routing configuration In 90 of cases mis configured jumper configuration will explain lack of aud
5. d create a short circuit and damage your board 1 The first step consists in reading the plug in datasheet to figure out which I2S channels will be available from the miniDSP kit This information is useful to understand how external I O cards can link up to the miniDSP kit Taking for example the Crossover plug in you can read in the technical specification section marn id sp Digital Inputs Plug in IN 1 amp 2 selectable on 12S _Data_In78 amp 8 Digital Outputs Plug in OUT 1 2 3 4 available on I2S_Data_Out1 2 3 4 Un processed signal from ADC on 2S_Data_Out5 Un processed signal from Digital IN on 12S_Data_Out 7 8 In other words If you want to send the SPDIF input signal for processing on the miniDSP kit you need to route the miniDIGI to the plug in inputs in other words place a jumper on I2S_Data_in7 amp 8 channels If you want OUT 3 amp 4 post plug in processing by the miniDSP to be converted to SPDIF out on the miniDIGI you will need to grab 12S_Data_Out3 amp 4 from the expansion bus See the example below for exact location of jumpers for that template configuration 12S_Data_IN_ch7 amp 8 128 Data_IN_ch5 amp 6 128 Data_IN_ch3 amp 4 128 Data_IN_ch1 amp 2 128_Data_OUT_ch78 amp 8 128_Data_OUT_ch58 amp 6 12S_Data_OUT_ch3 amp 4 Master qe ene a E 12S_Data_OUT_ch1 amp 2 Slave Jumper ia ee pH Hi i Always closed for EE a z SCLK amp LRCLK MCLK selection Jumper symbol D To prevent
6. ink 1 Routing of 1xl2S_in amp Selection of one of the I2S_IN ch1 amp 2 input source I2S_IN ch3 amp 4 12S_OUT ch1 amp 2 12S_OUT ch3 amp 4 12S_OUT ch5 amp 6 12S_OUT ch7 amp 8 amp 1xI2S_out 12S_IN ch5 amp 6 12S_IN ch7 amp amp gt marn id sp 1 Audio inputs SPDIF TOSLINK are connected to a source selection header where the user can select 1 out of the 4 sources 2 Signal is then fed to the Digital Audio Receiver which translates the SPDIF Toslink signal to an 12S signal 3 The sample rate converter SRC is next in line to insure the input signal is compatible with the miniDSP configured sample rate 48kHz 4 The next step is the I2S routing i e the routing of a digital signal to the I2S bus shared between boards in a stacked configuration link cables As shown in the diagram below using jumpers one can decide to route the I2S data signal on any 12S channels of the expansion bus Jumper selects which 12S channel the SPDIF or Toslink Input SPDIF input signal is being routed to Jumper selects SPDIF or Toslink which 12S channel Input the SPDIF output receives 5 Finally 12S OUT jumpers allow you to configure which channel you want to convert from I2S to SPDIF Toslink if it is ever required Step by Step configuration Please pay attention to the following diagram to clearly understand how to route your data to the correct pin Incorrect configuration coul
7. inmid sp miniDIGI I O card USER MANUAL V1 3 Revision Description Date V1 0 User manual Initial version 25 02 2010 V1 1 Updated section on Digital Analog toggle switch 05 05 2010 V1 2 Updated diagrams for I2S section 02 06 2010 V1 3 Updated general descriptions 01 02 2011 inmid sp 1 Board connectivity 1 1 Board diagram Toslink 1 Toslink 2 SPDIF 1 SPDIF 2 Expansion connector J2 Master Slave jumper DC in SPDIF OUT Optical OUT Expansion Connector J16 Source selection header Expansion connector J16 I2S channel selection header Pin Description Pin Description 1 n a 2 n a 3 n a 4 n a 5 Ground 6 Ground 7 Ground 8 Ground 9 MCLKIN 10 I2S_DATA_IN1 amp 2 I2S_DATA_IN3 amp 4 12 I2S_DATA_IN5 amp 6 3 I28_DATA_IN7 amp 8 amp 14 I2S_IN_LRCLK 5 I2S_IN_BCLK 16 I2S_DATA_OUT1 amp 2 7 12S DATA_OUT3 amp 4 18 I2S_DATA_OUT5 amp 6 9 IS2_ DATA_OUT7 amp 8 amp 20 I2S_OUT_LRCLK 21 I2S_OUT_BCLK 22 3 3V 23 n a 24 3 3V 25 GND 26 GND 27 n a 28 n a marn id sp 1 2 Input Source Selection The miniDIGI has a total of 4 inputs 2x SPDIF on RCA connectors with isolation transformers 2x Toslink connection on Optical receivers However only one signal can be selected at a time using a single jumper on a 2 x 4 header Warning that placing more than one jumper could damage the board and void your warranty Toslink 1 Toslink 2 SPDIF 1 SPDIF 2 BBM switch toggling between SPDIF1
8. io 2 miniDSP LED not In a stacked configuration with a miniDSP Contact us flashing make sure to configure the miniDSP board to Slave Clock see manual to be able to receive the master clock from the miniDIGI board 2 High Frequency This is a typical symptom of an incorrectly n a noise on signal configured MCLK Master Slave on a miniDSP and miniDIGI configuration Please make sure to double check the jumper chart for the correct configuration Contact Problem unsolved by Have a look at our forums to see if someone n a Us above suggestions else already had this issue Send us an email info minidsp com with a clear explanation of the symptoms and descriptions of the troubleshooting steps you already followed A picture of the jumper configuration is worth a thousand words
9. potential damage with short circuits these rules should be followed at all times Select only one SPDIF Toslink source from the input source selection header Select only one I2S_Data_OUT lines on the 12S routing header I2S Master Slave configuration To allow stacking of multiple boards on top of each other miniDIGI have the capability to run as e 12S master Jumper removed open The board outputs clocks LRCK SCLK This configuration applies to the following board combinations o miniDIGI miniAMP o miniDIGI external D A e 12S slave Jumper in place closed The board receives clocks from another I2S device master This configuration applies to the following combinations o miniDIGI miniDSP o miniDIGI 2 x miniDSP Loopback mode miniDIGI board can be configured in a loop back mode for either SPDIF de jittering or daisy chaining of multiple miniDIGI boards A single jumper placed vertically between inputs and outputs is all you need to link up the incoming SPDIF stream to the SPDIF output oJ Gay gem seen Loop back mode vet a SST tna p miea SE g a enabled when jumper in place at this location marn id sp A miniDSP 1 miniDIGI 1 Delay all outputs of this stack only SPDIF minDIGI template configurations SPDIF loop back Note that in a loop back mode audio will effectively go through 2 x miniDIGI and introduce 2 88ms of delay in the path In other words all outputs
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