17
HDR-60 Base Board – Revision B
Figure 7. Bitstream Ready to Download into LatticeECP3 SRAM
10. Click
Project >Download
or the green
Go
button to download the bitstream into the LatticeECP3 device (U2).
A small window will appear as shown in Figure 8. It will take about 12 seconds to download the bitstream for a
PC with USB 2.0 ports. When the LatticeECP3 has loaded in correctly, the ispVM status window will report
“Operation Successful” as shown in Figure 9.
Figure 8. Bitstream Downloading into LatticeECP3
Figure 9. Bitstream Download Operation Successful
LatticeECP3 SRAM Configuration Using SPI Flash and USB Cable at J12
The LatticeECP3 SRAM can be configured easily using the ispVM System software to program the on-board SPI
Flash via a standard USB cable connected to the upper USB port at J12. The LatticeECP3 device is SRAM-based,
so it must remain powered on to retain its configuration when programming the SRAM. The on-board SPI Flash
retains its programmed bitstreams when power is off, and can quickly load programmed bitstreams into the
LatticeECP3 device when power is applied.
1.
Attach a ground connection from test equipment chassis ground to the ground plane of the board, for example
on the metal HDMI connector.
