Chapter 1
22
3.
Configure the master module to use either an internal or external trigger source. The
Scalable Bus cables and connectors provide the internal trigger signal (but not the external
trigger signal) from the master module to the slave modules. Therefore, if you are using
an internal trigger to trigger the master and slave modules, the Ext Clk BNC connector on
the slave modules is not used.
If you select an external trigger, ensure that you attach a trigger signal to the Ext Trig BNC
connector on the master module and to the Ext Trig BNC connector on each slave module.
Refer to the
DT9840 Series Getting Started Manual
for more information on attaching signals.
For asynchronous operation, you can set the clock source for both the master and slave
modules to either internal or external (but not to Scalable Bus master). Each module is then
clocked and triggered separately; you can communicate with all the modules on the bus using
software.
You can perform the following communication operations on the Scalable Bus using software:
• Return the address of slave modules
• Determine whether the module is ready for data transfer
• Allocate and deallocate buffers for data transfer
• Initiate transfer requests from the slave
• Transfer data and messages from the master to the slave
LEDs
LED CR6 on the DT9841E module and LED CR1 on the back of all other DT9840 Series
modules is a two-color device that indicates the state of the DT9840 Series module. Refer to
the
DT9840 Series Getting Started Manual
for the location of this LED.
When power is applied to the module, this LED turns green. When the module is recognized
by the host and the firmware is downloaded to the module, the LED turns red. When the
Windows driver is loaded and started, the LED turns orange. The module is then ready for
use.
When you download and run your DSP program, this LED flashes green and orange. If the
downloaded program stops running, this LED turns stops flashing (in either the green or
orange state) to indicate that an error occurred, and the debug LEDs (CR7 to CR14) turn on.
You can define the state of the debug LEDs using software.
Note:
Debug LEDs are not supported on DT9841E modules.
Summary of Contents for DT9840 Series
Page 1: ...DT9840 Series UM 19197 T User s Manual Title Page ...
Page 4: ......
Page 44: ...Chapter 1 44 ...
Page 76: ...Chapter 2 76 ...
Page 98: ...Appendix A 98 ...
Page 124: ...Appendix B 124 ...