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參數(shù)資料
| 型號： | CLC-CAPT-PCASM |
| 文件頁數(shù)： | 4/15頁 |
| 文件大?。?/td> | 763K |
| 代理商： | CLC-CAPT-PCASM |
http://www.national.com
4
SMA Connectors
The output clock SMA connector provides a signal that
can be used to phase lock a signal source. The
frequency is that of the input clock signal divided by 2.
For example, with an attached CLC5958 ADC evaluation
board at 52MSPS the clock output signal will be a
26MHz square wave. The second SMA connector is
currently unused.
Serial Port
The serial port is con
fi
gured at 115,200 baud with one
stop bit, no parity, and 8-bits per character. Although the
DSR, CTS, and RTS control signals are connected, they
are not used. XON/XOFF
fl
ow control is supported. The
fl
ow of returned data pauses after an XOFF character
(DC3, ctrl-S, hexadecimal 13) has been received. The
fl
ow of returned data resumes after an XON character
(DC1, ctrl-Q, hexadecimal 11) has been received. The
Data Capture Board initializes as if an XON character
had been received.
Power Up the System
Once the WCLK jumper, VCCD jumper, and the DIP
switches have been set, (for example, for the CLC5957
we have set WCLK at RDY2, VCCD at +5, and DIP
switches 1,2,3,4,5 as ON,ON,ON,OFF,OFF) connect the
evaluation board to the data capture board, apply power,
clock, and signal to the boards, and connect the serial
cable to the PC. Some PCs will need to be rebooted at
this point, but it may not be necessary with your PC.
In the software con
fi
guration section, next, we will
check
the
communication between the PC and the data
capture board.
Light Emitting Diode (LED) Status Monitors
3 of the 6 LEDs are used to provide status indications.
LED 1:
static RAM ICs. While the static RAM is being
written or read, it blinks. After the Data Capture
Board is powered up and the FPGA is initialized, it is
on to indicate that the board is ready. After all the
SRAM data has been output, it is off.
LED 2:
This LED is on when captured data is available
to be output to the serial port. After all the data has
been output, it is off.
LED 6:
This LED is connected to the clock signal
selected by DIP switch 1. When the clock is
toggling, it will be on at less than full intensity.
This LED is connected to an address line of the
So, at this point in your setup, you should have LED 1 on
at full intensity and LED 6 on at reduced intensity. You are
now ready to con
fi
gure the software for data capture.
Software Con
fi
guration
Run the program
tory that you chose during the CD-ROM installation. The
default directory is
“c:\nsc\”
menu: start
→
programs
→
nsc
“capture.exe”
. It is located in the direc-
. You can also use the start
→
capture.
When you run
window pop up onto your PC:
capture.exe
, you will see the following
This is the data capture control panel. It is small to
conserve monitor area for other programs. The main
function of the panel is to initiate data capture. Before we
capture data we must con
fi
gure the computer and the
board. By clicking on the
control panel
mouse button (right click), we bring up the following
con
fi
guration menu:
with the RIGHT
The
fi
rst thing to con
fi
gure is the COM port on the
computer, so move the mouse to
click with the LEFT mouse button. This will bring up the
following menu:
“Configure I/O”
and
Select the COM port that you have attached to the data
capture board, and press
“OK”
send a command to the data capture board. If the data
capture board responds and the COM port interface is
operating correctly, the
“Configure I/O”
pear, and the Data Capture control panel will return. If
there is a problem with the COM port interface, you will
get the following message:
. The computer will then
menu will disap-
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