Modes

The “Conﬁgure I/O” button opens the user port option menu window. Clicking the left mouse button selects the desired port (the default Windows address and IRQ is assumed). Clicking the “OK” button sends an identiﬁca- tion command out the selected port and listens for the Capture board to echo back the command. This function requires that DC power and data clock is present. If the hardware is functional and the proper PC port connected, the Conﬁgure I/O window will then close and return back to the user Control Panel. Capture Board LED#6 will be lit if the data clock is present.

If the incorrect serial port is selected or if the hardware is dysfunctional (i.e. missing power or clock) the program will return an error-warning window.

Click the “OK” button to clear the warning and then try the other PC serial port in the “I/O Conﬁguration” window or correct the hardware problem.

The “Change Data File” button enables a dialog window where the user can direct the location of the captured data ﬁle. The desired ﬁle name and path can be typed into the box. Clicking the left mouse on the button on the right side of the ﬁle name box opens a standard browser window to search for an appropriate ﬁle name. The “Default” button restores the default directory and ﬁle name. The attached Matlab script analysis routines (*.m ﬁles) assume that the data is located at this location; however, the user can edit the routines to load from the appropriate location. Clicking the “OK” button updates the Capture program’s *.ini ﬁle and returns to the Capture Control Panel.

The “Conﬁgure Capture” button invokes the user dialog window for the remainder of the conﬁguration options. After selecting the desired options, a left mouse click on “OK” stores the conﬁguration variables and returns to the Control Panel. Positioning the mouse pointer over the Progress Bar inside the Control Panel pops up a text bub- ble which displays the conﬁguration variables used when the Capture Program is started. Next is a discussion of the Mode functions and the related sub-functions:

There are four primary modes in which to run the data capture system, each with its own associated options:

1.Capture mode conﬁgures the Capture Board for data reception from the DRCS evaluation board. Both serial and the parallel output ports can be used as the source data path.

a)The 24-Bitsoption captures serial DRCS data FROM either of the two serial data ports. The Capture 1st Bit option should be selected for this mode of data capture. With CLC5902 DDC in “packed” and “mux_mode”, the AOUT data source contains both phases of both DDC channels. The two Channel buttons select the desired DDC channel to be stored in the SRAM. The four Phase buttons select either I or Q phase or the ordering of alternating I/Q phases. In this latter case, the 32K RAM space is shared. Therefore, only 16K points of each phase are collected. If the BOUT data source is selected, the CLC5902 DDC must be instructed accordingly (i.e. “packed” and “mux_mode” off). With the DDC in its default output format, the BOUT serial port is disabled.

b)The Upper 16-Bits and Lower 16-Bits options enable the CLC5902 DDC’s parallel outputs. In this conﬁguration the DDC parallel output mux is controlled by the FPGA through the 64 pin Euro connector (be sure that the DRCS board SW1 “POUT” switches are OFF/OPEN). The user selects Channel and Phase and the FPGA instructs the DDC which channel, phase, and which half of the 32-bit output word to send out its parallel data bus. This conﬁguration uses the FIFO for temporary data storage.

2.Histogram mode returns the Capture Board to the 24-bit serial data mode. As before, with the CLC5902 DDC in “packed” and “mux_mode”, the AOUT data source contains both phases of both DDC channels. A DDC change is required to enable the BOUT. The Capture 1st Bit option should be selected as before. In the Histogram conﬁguration, the program Start button ﬁrst sets every SRAM location value to zero. The hardware then samples the data, reads the value at that memory location, increments the value, and writes back the updated value. The process continues until one of the memory values reach the target value set by SW1

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