LAN TCP-IP COM-5001 -> 
	Arbitrary Waveform Generator COM-8001 -> 
		BPSK/QPSK/OQPSK digital modulator COM-1002


This test setup demonstrates the ability to 
- store and play-back a large (1MByte) data file in SDRAM within the COM-8001
- use the 2-bit wide data stream from the COM-8001 as input to the COM-1002 QPSK modulator
- playback and perform QPSK modulation at the maximum rate of 19 Mbit/s (9.5 Msymbols/s QPSK).

Configuration:
- 1 Mbyte file, packed as 4 (I,Q) data pairs per byte, for a total of 4 Msamples.
- QPSK modulation. 19 Mbit/s. 9.5 Msymbols/s
- IP address: 172.16.1.128

The ComBlock assembly IP address is configured to be 172.16.1.128
If this IP address does not match your network, edit the 5001_8001_1002.stn file
(change the COM-5001 registers 0-3 [IP address], 4-7 [IP mask].

Proper operation can be verified as follows:

(a) connect a serial cable between the host PC and the DB9 connector of the COM-5001

(b) connect a COM-5001 to the LAN. 

(c) power up the comblock assembly. Using the ComBlock Control Center, enumerate the 
Comblock assembly (2nd button from the left). Import the 5001_8001_1002.stn file, using
the File|Import menu. 

(d) Power the assembly down, then up again so that the new IP address is in effect.
Enumerate the comblock assembly again.

(e) Using the ComBlock Control Center Functions|Pattern generator menu, 'Start Upload' 
the binary data file D8_1Mbyte.bin The file consists of 1Mbytes of 0xD8 characters.
The file is stored in the same directory as the 5001_8001_2001.stn file.
The file contains samples in binary format. Do the entire upload, starting at address 0.
Select Action = Start Upload. Then Apply.
The menu should show a quick progress bar, then indicate upload completion with 1,000,000 
bytes uploaded.
 
(f) using the ComBlock Control Center Functions | Pattern Generator, 
download the file. Select Action = Start continuous download. Then Apply.
The data is 'pulled' by the QPSK modulator at a rate of 9.5 Msamples/s, 
with 2 bit output width (I/Q).

Using an oscilloscope, the user can verify that
  (1) the sampling rate at the modulator input interface is 9.5 Msamples/s 
  Place the probe on the COM-1001 J1 connector, pin B1 (top level).
  SAMPLE_CLK_IN consists of 25ns pulses at 9.5 Msamples/s in the average.
  (2) the I-channel input data stream consists of 00110011.. etc
  Place the probe on the COM-1001 TP2 test point
  (3) the Q-channel input data stream consists of 01010101.. etc
  Place the probe on the COM-1001 TP3 test point

The I/Q data stream is consistent with the 0xD8 bytes stored in SDRAM. 
Indeed 0xD8 = 11 01 10 00
              QI QI QI QI