AUX-TDM
64×64 channel Time Division Multiplexing/I2S Card for FLX devices
User’s Manual
DESCRIPTION
The AUX-TDM card provides up to 64×64 channels Time Division Multiplexing (TDM) interface on a 3.3V LVCMOS I/O. It supports four lines of data plus BCLK/LRCLK/MCLK/MUTE outputs, and four lines of data plus BCLK/LRCLK/MUTE inputs.
It can be fitted into every flexiverter (FLX) device for the following purposes:
- to use the FLX as standalone converter between the built-in interface and this extension card
- to add extra output splits to existing FLX devices by “tapping” channels of another conversion
- to add additional channels/protocols to the FLX when it is used in doubleflexiverter or flexiverter+multiverter configurations
For a detailed description of possible configurations, please refer to the manual of your base FLX device.
1.1. Box Contents
- 1 AUX-TDM card
- 1 Slot cover plate
- 34-pin, 0.635mm pitch ribbon cable, 30cm/1ft.
- This manual
INSTALLATION
2.1. Opening the flexiverter
- Required: Torx T10 screwdriver
- Power off the device and detach all cables to avoid short-circuit or damage
- Detach the device from the rack-mount kit
- Remove the four top screws and the top cover by pulling it upwards:
2.2. Flexiverter Inside View
- Screws for AUX cover plate
- AUX card connector
2.3. Installing the card
- Remove the screws holding the cover plate, and the blank cover plate ➊
- Insert the AUX card from inside, using the supplied cover plate.
CAUTION: The slot cover must be located on the inside the slot.
Make sure it is correctly fitted to the card connector➋ - Secure the card using two cover screws ➊
- The card has been installed correctly if you are able to select an audio routing mode involving AUX (long-press MODE button to enter Route Mode Selection).
TDM INTERFACE PINS
3.1. Pinout (when looking on the card connectors mating face)
3.2. Pin descriptions
| Pin | Signal | Direction | Description | TDM16 | TDM8 | TDM4 | TDM2(Stereo) |
| 1,2, 34 | +3.3V | Output | Supply for external circuit (1.5A max). Do not connect when external circuit has its own power supply | ||||
| 4,6,8,10,12,14,16,18, 20,22,24,26,28,30,32 | Ground. All GND lines on the external circuit should be connected to ensure proper shielding between data lines | ||||||
| 3 | BCLK_IN | Input | Bit Clock input. TDM_IN* lines are sampled on the rising edge of this signal | 512* LRCLK_IN | 256* LRLCK_IN | 128* LRCLK_IN | 64* LRCLK_IN |
| 5 | LRCLK_IN | Input | Left/Right Clock input (Wordclock). Must be a 50% duty cycle. First half of the TDM_IN* audio channels are read during LRCLK_IN=0, second half of TDM_IN* channels during LRCLK_IN=1 |
||||
| 7 | TDM_IN0 | Input | Audio data input line 0. Must be 32 bit per channel, left-justified or I2S depending on DIP setting. Only the first 24 bits of each channel are read, the rest is ignored. |
Ch 1-16
(512 bit per LRCLK) |
Ch 1-8
(256 bit per LRCLK) |
Ch 1-4
128 bit per LRCLK) |
Ch 1-2
(64 bit per LRCLK) |
| 9 | TDM_IN1 | Input | Audio data input line 1 | Ch 17-32 | Ch 9-16 | Ch 5-8 | Ch 3-4 |
| 11 | TDM_IN2 | Input | Audio data input line 2 | Ch 33-48 | Ch 17-24 | Ch 9-12 | Ch 5-6 |
| 13 | TDM_IN3 | Input | Audio data input line 3 | Ch 49-64 | Ch 25-32 | Ch 13-16 | Ch 7-8 |
| 15 | MUTE_IN | Input | L: Normal operation H: Mute inputs, input data is ignored |
||||
| 17 | Reserved | ||||||
| 19 | BCLK_OUT | Output | Bit Clock output. TDM_OUT* audio data changes on falling edge and is valid on rising edge | 512* LRCLK_OUT | 256* LRLCK_OUT | 128* LRCLK_OUT | 64* LRCLK_OUT |
| 21 | LRCLK_OUT | Output | Left/Right Clock output (Wordclock), 50% duty cycle. First half of the TDM_IN* audio channels are written during LRCLK_IN=0, second half of TDM_IN* channels during LRCLK_IN=1 | ||||
| 23 | TDM_OUT0 | Output | Audio data output line 0. 32 bit per channel, left-justified or I2S depending on DIP setting. Output is always 24 bits of audio plus 8 padding bits per channel. Data is valid on the rising edge of BCLK_OUT |
Ch 1-16 (512 bit per LRCLK) |
Ch 1-8 (256 bit per LRCLK) |
Ch 1-4 (128 bit per LRCLK) |
Ch 1-2 (64 bit per LRCLK) |
| 25 | TDM_OUT1 | Output | Audio data output line 1 | Ch 17-32 | Ch 9-16 | Ch 5-8 | Ch 3-4 |
| 27 | TDM_OUT2 | Output | Audio data output line 2 | Ch 33-48 | Ch 17-24 | Ch 9-12 | Ch 5-6 |
| 29 | TDM_OUT3 | Output | Audio data output line 3 | Ch 49-64 | Ch 25-32 | Ch 13-16 | Ch 7-8 |
| 31 | MUTE_OUT | Output | L: Normal operation H: Output data is invalid and should be muted |
||||
| 33 | MCLK_OUT | Output | Master clock output | 256*LRCLK | |||
Do NOT leave any input pins floating. Connect unused pins to GND or VCC, preferrably with a 10k resistor.
3.3. I/O Waveforms
3.4. Electrical I/O characteristics
| Pins | Parameter | Value | Unit | ||
| Min | Typ | Max | |||
| +3.3V | VCC | 3.135 | 3.3 | 3.465 | V |
| ICC | 1.5 | A | |||
| BCLK_IN, LRCLK_IN, TDM_IN*, MUTE_IN | VIH | 2.0 | VCC+0.5 | V | |
| VIL | -0.5 | 0.8 | V | ||
| BCLK_OUT, LRCLK_OUT, TDM_OUT*, MUTE_OUT, MCLK_OUT All | VOH | 3.2 | 3.3 | VCC | V |
| VOL | 0 | 0.1 | V | ||
| IO ESD protection | ±20 | mA | |||
| IEC 61000-4-2 Level 4 ESD Protection ±15-kV Contact Discharge / ±15-kV Air-Gap Discharge IEC 61000-4-4 EFT Protection: 80 A (5/50 ns) IEC 61000-4-5 Surge Protection: 3 A (8/20 µs) |
|||||
DIP SETTINGS
The behavior of the card can be controlled by DIP switches 4..6 on the FLX device.
Changing the DIP settings will come immediately into effect.
| TDM mode |  |
*TDM16. Each I/O line carries 16 channels of 32 bit audio data each (512 bits/BCLK cycles per LRCLK) |
 |
TDM8. Each I/O line carries 8 channels of 32 bit audio data each (256 bits/BCLK cycles per LRCLK) | |
 |
TDM4. Each I/O line carries 4 channels of 32 bit audio data each (128 bits/BCLK cycles per LRCLK) | |
 |
TDM2 (Stereo). Each I/O line carries 2 channels of 32 bit audio data ea. (64 bits/BCLK cycles per LRCLK) | |
| Format selection |  |
*Left-justified, 32 bit per ch (24 bit audio data + 8 bits zero padding) |
 |
I2S-Format, 32 bit per ch (24 bit audio data + 8 bits zero padding) Data is delayed by 1 BCLK cycle |
* Default setting
SELF-TEST
The card can be tested for correct operation by the user. This is done using the special self-test mode, in which a special random test pattern is output on all channels. This pattern is looped back via an external cable into the corresponding inputs, where it is checked for consistency.
Note: A special loopback plug is required for this. The plug must connect pins 1-9, 2-10, 3-11, 4-12, 5-13, 6-14, 7-15, 8-16.
- Attach the loopback plug
- Turn off the FLX, and hold down
button while switching on again - Press again until the “CLOCK” LEDs show “INT/48kHz” in
cyan color. The device is now in self-test mode. - The “AUX” LED in the MODE sections shows the result of the self-test:
red: error/no connection
green (loopback data received ok) - Press again or power off the device to exit self-test mode.
SPECIFICATIONS
| Parameter | Value |
| Dimensions | 118x80mm (WxH) |
| Weight | 40 g |
| Operating temperature | 0..+55°C, non-condensing |
| Storage temperature | -40..+85°C, non-condensing |
| Inputs | Up to 64 channels TDM16 (4 lines with 16ch each) Up to 32 channels TDM8 (4 lines with 8ch each) Up to 16 channels TDM4 (4 lines with 4ch each) Up to 8 channels stereo (4 lines with 2ch each) LRCLK (left/right clock). Polarity: frame starts with falling edge BCLK (bitclock): Data is sampled on rising edge |
| Outputs | Up to 64 channels TDM16 (4 lines with 16ch each) Up to 32 channels TDM8 (4 lines with 8ch each) Up to 16 channels TDM4 (4 lines with 4ch each) Up to 8 channels stereo (4 lines with 2ch each) LRCLK (left/right clock). frame starts with falling edge BCLK (bitclock): Data changes on falling edge MCLK: 256*LRCLK |
| Cable lengths | 30cm / 1 ft. maximum |
| Sample rates | 44.1/48kHz 88.2/96kHz (channel count is halved) 176.4/192kHz (channel count is quartered) |
| Latency | Interface <> Flexiverter internal: 2 samples |
APPENDIX
7.1. Available AUX cards
At the time of writing (2021-11), the following AUX cards are available. More will come, please check www.appsys.ch for updates.
| Item | Description |
| AUX-ADAT | 16x16ch ADAT I/O (2x Toslink In+2x out). Supports also S/PDIF |
| AUX-ADAT-64 | 64x64ch ADAT I/O (8x Toslink In+8x out on external breakout box) |
| AUX-AES3 | 8x8ch AES3 I/O on 1x DB25, fully transformer isolated |
| AUX-AES67 | 64x64ch AES67 network card |
| AUX-DANTE | 64x64ch DANTE network card |
| AUX-MADI-COAX | 64x64ch MADI for coaxial cable (BNC connectors) |
| AUX-MADI-OPTO | 64x64ch MADI optical, SC connector (Multimode 125um 1310 nm) |
| AUX-MADI-SFP | 64x64ch MADI for SFP (Small-Factor Pluggable) modules |
| AUX-WORDCLOCK | BNC wordclock I/O |
7.2. Available FLX devices
At the time of writing (2024-04), the following FLX devices are available. More will come, please check www.appsys.ch for updates.
| Item | Description |
| FLX-AES3 | 16×16 channel AES3 flexiverter (with AUX slot) |
| FLX-AES3/SRC | 16×16 channel AES3 flexiverter with optional independent SRCs on the AES3 inputs (with AUX slot) |
| FLX-AES50 | 96×96 channel AES50 flexiverter (with AUX slot) |
| FLX-AES67 | 64×64 channel AES67 flexiverter (with AUX slot) |
| FLX-DANTE | 64×64 channel DANTE flexiverter (with AUX slot) |
| FLX-MADI | 128×128 channel MADI SFP & MADI coaxial module (with AUX slot) |
7.3. Warranty
We offer a full two (2) year warranty from the date of purchase. Within this period, we repair or exchange your device free of charge in case of any defect*. If you experience any problems, please contact us first. We try hard to solve your problem as soon as possible, even after the warranty period.
* Not covered by the warranty are any damages resulting out of improper use, willful damage, normal wear-out (especially of the connectors) or connection with incompatible devices.
7.4. Manufacturer contact
Appsys ProAudio
Rolf Eichenseher
Bullingerstr. 63 / BK241
CH-8004 Zürich
Switzerland
www.appsys.ch
info@appsys.ch
Phone: +41 43 537 28 51
Mobile: +41 76 747 07 42
7.5. Recycling
According to EU directive 2002/96/EU, electronic devices with a crossed-out dustbin may not be disposed into normal domestic waste. Please return the products back for environment-friendly recycling, we’ll refund you the shipping fees.
7.6. Document Revision History
1: Initial release
7.7. About this document
All trademarks mentioned in this document are property of the respective owners.
All information provided here is subject to change without prior notice.
Document Revision: 1 · 2024-05-02
Copyright © 2024 Appsys ProAudio · Printed in Switzerland
IDENT 9.00.xxxxx.00
Documents / Resources
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