LimeSDR-USB hardware description
LimeSDR-USB Board Key Features
The LimeSDR-USB development board provides a hardware platform for developing and prototyping high-performance and logic-intensive digital and RF designs using Altera’s Cyclone IV FPGA and Lime Microsystems transceiver.
The LimeSDR-USB has two different USB connector versions. LimeSDR-USB 1v4 is micro USB type B connector (socket) based, as shown in Figure 1. LimeSDR-USB 1v4s is a USB type A connector (plug) based, as shown in Figure 2.
LimeSDR-USB board features:
- USB Interface
- Cypress FX3 Super Speed USB 3rd generation controller
- FPGA Features
- Cyclone IV EP4CE40F23C8N device in 484-pin FPGA
- 39’600 logic elements
- 1134 Kbits embedded memory
- 116 embedded 18x18 multipliers
- 4 PLLs
- FPGA Configuration
- JTAG mode configuration
- Active serial mode configuration
- Possibility to update FPGA gateware by using FX3 (USB)
- Memory Devices
- 2x 1Gbit (64M x 16) DDR2 SDRAM
- 4Mbit flash for FX3 firmware
- 16Mbit flash for FPGA gateware
- 2 x 128K (16K x 8) EEPROMs for LMS MCU firmware, LMS MCU data
- 1 x 64K (8K x 8) EEPROM for FX3 data
- Connections
- microUSB3.0 (type B) connector or USB3.0 (type A) plug
- Coaxial RF (U.FL) connectors
- FPGA GPIO headers (0.05” pitch)
- FPGA and FX3 JTAG connectors (0.05” pitch)
- 6..12V DC power jack and pinheader
- Fan connector (3.3V)
- Clock System
- 30.72MHz VCTCXO (precision: ±1 ppm initial, ±4 ppm stable).
- Possibility to lock VCTCXO to external clock or tune VCTCXO by onboard DAC
- Programmable clock generator for the FPGA reference clock input or LMS PLLs
- Board Size 60mm x 100mm (2.36” x 3.94”)