Overview
One of the key elements of LimeSDR XTRX board is the Xilinx Artix-7 (XC7A50T-2CPG236I) FPGA, the main function of which is to transfer digital data between the LMS7002M RF transceiver and an attached host viaPCIe, or via connection to another FPGA board. The block diagram for LimeSDR XTRX board is presented in the Figure 3.
Figure 3: LimeSDR XTRX v1.2 board block diagram
This section contains component location description on the board. LimeSDR XTRX board picture with highlighted connectors and main components are presented in Figure 4 and Figure 5, respectively.
Figure 4: LimeSDR XTRX v1.2 board top connectors and main components
Figure 5: LimeSDR XTRX v1.2 board bottom connectors and main components
Description of board components is given in the Table 1.
Featured Devices |
||
|---|---|---|
Board Reference |
Type |
Description |
IC1 |
RF transceiver |
Lime Microsystems LMS7002M |
IC7 |
FPGA |
Xilinx Artix-7(XC7A50T-2CPG236I) |
IC19 |
USB 3.0 microcontroller |
Microchip USB 2.0 to transceiver chip USB3333E-GL |
Miscellaneous devices |
||
IC9 |
IC |
Temperature sensor TMP1075NDRLR |
IC16 |
IC |
SIM Card Interface NVT4555UKZ |
Configuration, Status and Setup Elements |
||
X9 |
JTAG chain connector |
FPGA programming connector on the PCB bottom side (compatible with Molex 788641001 connector) |
LED1, LED2 |
Status LEDs |
User defined FPGA indication LEDs |
General User Input/Output |
||
X12 |
Pin header |
8-pin FPC connector |
Memory Devices |
||
IC2 |
IC |
I²C EEPROM Memory 128Kb (16 x 8), connected to LMS7002M RF transceiver I2C bus |
IC13 |
IC |
I²C EEPROM Memory 128Kb (16K x 8), connected to FPGA I2C bus |
IC18 |
IC |
SPI Flash Memory 256 Mb (32M x 8) connected to FPGA SPI |
Communication Ports |
||
X11 |
USB 2.0 |
USB 2.0 Micro-B socket |
X10 |
mini PCIe |
mini PCI Express Card Edge connector |
Clock Circuitry |
||
XO1 |
VCTCXO |
26.00 MHz Voltage Controlled Temperature Compensated Crystal Oscillator |
IC17 |
IC |
16 bit DAC for VCTCXO (XO1) frequency tuning (default) |
IC11 |
IC |
GNSS Receiver module |
IC8, IC10, IC12, IC14 |
IC |
Logic level converters |
IC15 |
IC |
Analogue switch |
IC20 |
IC |
Analogue switch |
X7 |
U.FL connector |
Reference clock input/output (CLK) |
X6 |
U.FL connector |
1PPS input |
X5 |
U.FL connector |
GNSS (active) antenna connector |
Power Supply |
||
IC22 |
IC |
Four-output switching regulator LP8758A1E0YFFR |
IC31 |
IC |
Four-output switching regulator LP8758A1E0YFFR |
IC21 |
IC |
Linear regulator LD39100PUR |
IC26 |
IC |
Linear regulator LD39100PUR |
IC29 |
IC |
Linear regulator LD39100PUR |
IC32 |
IC |
Linear regulator LD39100PUR |
A more detailed description is provided in the following sections.