1.2. Block Diagram
A more detailed block diagram showing the various internal function blocks.
1.3. NetSDR Ethernet Interface
The NetSDR runs as a TCP/IP Server allowing a single client connection. The NetSDR primarily communicates at
the “Transport Layer” or Layer 4 of the OSI Reference Model. Both TCP and UDP are used to provide command and
data interfaces back to the client. A DHCP client may also be enabled that uses broadcast UDP to automatically obtain
network configuration from a local DHCP server. There is also a custom broadcast UDP system for setting up network
and other parameters as well as finding an unknown SDR on a network.
Even though there is only one physical Ethernet connection, one can think of the NetSDR interface as multiple logical
connections. The primary control and status messaging is done on a single TCP socket that provides guaranteed delivery
of the control and status messages. The high speed digitized data is a separate UDP path from the NetSDR back to the
Client. This normally goes back to the same IP address as the TCP control socket but it may optionally go to a secondary
IP client address on a different computer.
Rev. 1.03 2011-11-01
5
0 10 20 30
dB Attenuator
Protection
34 MHz
LPF
LTC6400
Preamp
34 MHz
LPF
LTC2205
FPGA
Digital Down Converter
FIFO Control
Ethernet Control
Atmel
AT91SAM7S256
uC
64K RAM
256K FLASH
100baseT
Ethernet Interface
TCP/UDP/IP Stack
MAC
PHY
RS232
Level
Converter
RS232
DTE
DE9M
BNC
RF In
I2C Control Bus
16 Bit
A/D
80.0
MHz
Clk
JTAG
Debug
Port
NetSDR
Block Diagram
Rev. 1.00 © 2010 RFSPACE Inc.
Activity
Power
Optional
RF
Module
BP
0-1.8MHz
Select Filter Path
Optional
Ref Lock
OCXO
Module
BNC
10MHz Reference
RJ45
Ethernet
DE9M
Pin 9
Mute
A/D Clip
5VDC
1.5A
IN
65K x 16
Deep FIFO
Configuration
FLASH
Settings
FRAM
Voltage
Regulators
Select
SPI Bus
Asynchronous Serial
USB
Type B
BP
1.8-2.8MHz
Bypass
BP
2.8-4.0MHz
BP
4.0-5.5MHz
BP
5.5-7.0MHz
BP
7 – 10 MHz
BP
10-14 MHz
BP
14-20 MHz
BP
20-28 MHz
BP
28-34 MHz
Full Speed USB
Mini Speaker
Optional
RF
Module
BNC
IF Out
I2C Control Bus
I2C Control Bus
3.5mm
AUX
Jack
I2C Control Bus
Jmp
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