IG810 Air OFDM Transceiver board

Table of Contents

Function
Variants
Parts
Programming
External interfaces
Service interfaces
Board view
Schematics

Function

The Air Side OFDM Transceiver board is responsible for pairing with Ground Side and communicating with it. The name comes from Orthogonal Frequency Division Multiplexing - which is a way of transferring broadband data. It implements the Lightbridge technology, and is transferring both data packets and video stream.

Variants

Known versions of the board are listed below. Additinally, the board is very similar to IG800 Air OFDM Transceiver board.

Marking	Overview
P00929.03

Parts

Marking	Amt.	Pkg.	Function	Specification
CY7C68013A-56 LTXC 1819 B 04 PHI CYP 615684 squareC 171	2	56-lead 8x8 QFN	EZ-USB FX2LP USB Microcontroller High-Speed USB Peripheral Controller; Lightbridge deserializer; receives H.264 encoded video data stream from USB input and deserializes it for Lightbridge digital data scrambler	description
Xlat 24.000 64 VP JI	1		quartz oscillator, 24 MHz
VUBI TI 61 A288	3	16-pin 3x3 QFN-4444	Texas Instruments TLV62130RGTR 3V to 17V 3A Step-Down Converter	description
Altera Cyclone V 5CEFA4U19I7N CABAU15A3A KOREA MAUAU34932 301FA5UOC e1	1	484-ball UFBGA	FPGA; Cyclone V E model 5CEA4, temp. range -40 to 100 deg C; Lightbridge digital data scrambler; handles input and output data streams of the RF transceiver	description
LPC1549J 01 01 25015 092A	1		32-bit Microcontroller based on Arm Cortex-M3	description
NS SI41??0 ??Q124	1		National Semiconductor; barely readable
25Q064A 13E40 60 CHN 51715J	1	8-pin 4x5 SOP	Micron Serial NOR Flash Memory; 64Mb, 1.8V, Multiple I/O, 4KB Sector Erase	datasheet
PA 5206 WSYJ	1		HF amp
AD9363 BBCZ #1609 3427350.1 Singapore	1	144-ball 10x10 CSP-BGA	Analog Devices Agile Radio frequency (RF) 2x2 transceiver with integrated 12-bit DACs and ADCs; Lightbridge RF transceiver	description
AEKF	1	8-pin SOT23	Maxim MAX3051EKA+T 1Mbps, Low-Supply-Current CAN Transceiver	datasheet

Programming

Chips	Firmware	Description
cy7c68013a	m1500	Provides communication with camera module, including video transmission.
Altera Cyclone 5 E + ATH542	m1900	Lightbridge FPGA air part; NAND flash memory stores the programming and the FPGA chip reads it during each startup.
NXP LPC1549		Lightbridge MCU; configures and drives FPGA and transceiver.

External interfaces

Marking	Overview
TODO

Service interfaces

The following service pads exist on this board:

Marking	Overview
TODO

Board view

Top of a P00929.03 board:

Bottom of the P00929.03 board:

Top of another P00929.03 board:

Bottom of the P00929.03 board:

Schematics

Functional diagram

flowchart LR
    Interboard-Encoder((inter-<br/>board conn<br/>to Encoder))
    Interboard-Encoder== video<br/>over<br/>USB ===USB-Deserializer
    Interboard-Encoder-- CAN<br/>DUML ---OFDM-CAN-trx
    subgraph Air OFDM Transceiver board
    USB-Deserializer[Cypress<br/>FX2LP USB<br/>deserializer]
    Data-Scrambler[Altera FPGA<br/>data encoder/<br/>scrambler]
    Lightbridge-MCU[Lightbridge<br/>MCU]
    Serial-Flash[Serial<br/>flash]
    OFDM-CAN-trx[CAN<br/>tx/rx]
    WiMAX-Transceiver[WiMAX<br/>double<br/>transceiver]
    Lightbridge-MCU-- tx config<br/>and DUML ---Data-Scrambler
    Lightbridge-MCU-- radio config<br/>via SPI ---WiMAX-Transceiver
    OFDM-CAN-trx---Lightbridge-MCU
    Serial-Flash-- bitstream ---Data-Scrambler
    USB-Deserializer===Data-Scrambler
    Data-Scrambler===WiMAX-Transceiver
    WiMAX-Transceiver===RF-Tx-Amp-A[RF power<br/>out amp]
    WiMAX-Transceiver---RF-Rx-Amp-A[RF LNA<br/>inp amp]
    WiMAX-Transceiver===RF-Tx-Amp-B[RF power<br/>out amp]
    WiMAX-Transceiver---RF-Rx-Amp-B[RF LNA<br/>inp amp]
    RF-Switch-A[RF<br/>switch]
    RF-Switch-B[RF<br/>switch]
    RF-Tx-Amp-A===RF-Switch-A
    RF-Rx-Amp-A---RF-Switch-A
    RF-Tx-Amp-B===RF-Switch-B
    RF-Rx-Amp-B---RF-Switch-B
    end
    Antenna-A1((Ant))
    Antenna-B1((Ant))
    RF-Switch-A---Antenna-A1
    RF-Switch-B---Antenna-B1

Loading

Thick lines present propagation of video data. The live video feed and data packets (incl. telemetry) come from Video Encoder board through inter-board connector. Video is wrapped with USB packets, so first the USB deserializer handles it and prepares input data for the FPGA. The FPGA, during power-on initialization, loaded a bitstream from Serial Flash, and became a digital data encoder for the Lightbridge protocol. It prepares the video data and telemetry to be sent through radio channel, and supplies it to WiMAX Transceiver, from where the modulated signal is amplified and sent toward antennas.

The antennas can also receive DUML packets from the RC, in which case the input RF signal is amplified through LNA, received through WiMAX Transceiver, and provided to the FPGA for error correction and unscrambling. The DUML packets are provided to the Lightbridge Main Controller Unit, and from there routed to Video Encoder board over CAN.

The MCU micro-controller is responsible for configuring the transmission by sending SPI commands to the WiMAX Transceiver, and setting logic signals on some configuration lines of the FPGA.

Hardware schematics

No schematics available.