[evlatests] Prototype 3-bit digitizer.

[Mike Revnell]

The hard parts are working.

The attached plot shows a 10 MHz sine wave digitized at a 4096 MHz sample 
clock frequency. The design uses a chip from Rockwell Scientific.

The data were captured in the FPGA on the digitizer board and downloaded 
to a computer through a test I/O port. It deomonstrates that many parts of 
the board are working.

The chip itself works (no smoke).

The 4Gb/s data paths from the digitizer to the demultiplexor chips work. 
The 512 Mb/s data paths from the demultiplexor chips to the FPGA work.

The next step is to put the data through the EVLA formatter and capture 
data in the EVLA deformatter.

Mike Revnell
National Radio Astronomy Observatory
Socorro, New Mexico
mrevnell at nrao.edu
revnell at ieee.org
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