Sundance SMT390-VP - Manual (Page 22)

Version 2.4 Page 22 of 55 SMT390-VP User Manual
Analog input section
Both analog inputs are AC-coupled (RF transformers).
ADC Settings
A sub-set of all the features of the AD9430 is implemented on the SMT390-VP: S1
for the data format (two’s complement or binary) and S5 for the scale (half or full).
Description of Interfaces
Memory Interface
Two groups of two 16-bit Samsung DDR SDRAMs form the volatile sample storage
space of the module. Each DDR SDRAM is 256 MBits in size. This provides the
module with a total of 64MBytes (or 32 Mega samples) of storage space per channel
- each 12-bit sample is stored into at 16-bit data location. Memory is implemented as
a block of 32-bit width.
Each channel contains a 32-bit DDRSDRAM controller. This interface is capable of
data transfer at 840MBytes/s. It is thus fast enough to write the incoming ADC data
stream into memory.
Note that only 63.75 MB are actually used to store the samples from the ADC.
MSP430 Interface
An 8-bit interface is implemented between the FPGA and the microprocessor. The
FPGA is the master and the microprocessor is the slave. This interface is used by the
microprocessor to write four temperature readings into a set of registers implemented
in the FPGA to make them available to the User.
Serial Number
This feature is removed from the SMT390-VP in later versions shipped after
25/05/2005.
Data can still be read out of the FPGA, but will have no meaning as the
microcontroller does not make any reading of serial number anymore.
A serial number is available on a sticker placed on the SMT390-VP.