Sundance SMT381 2004 - Manual (Page 22)

MSP430 is connected to ComPort 3 of the TIM. With the standard firmware
implementation ComPort 3 is used to communicate with the FPGA. ComPort 0 is
open for custom applications as it is not used by the SMT381-VP.
2.10 FPGA Configuration
In a typical Sundance system a carrier and host module (most likely a DSP module)
is needed to configure the SMT381-VP.
After a hardware reset the FPGA of the SMT381-VP is un-configured and the
microprocessor (MSP430) waits for a data stream. At this point the microprocessor is
in control of ComPort 3. The host can then send a data stream over ComPort 3
starting with a STARTKEY, then the data, and ending with an ENDKEY. This will
configure the FPGA via the microprocessor, and after configuration the
microprocessor will release ComPort3 so that the host can talk straight to the FPGA.
If at any time the host want to reset the FPGA the host must send a reset command
to it the SMT381-VP over the ComPort – Any hardware resets coming over the TIM
site will be caught by the microprocessor but will not be passed on to the FPGA.
If the FPGA is configured, but the host restarts its application, it must send an
ENDKEY only. This will ‘wake up’ the FPGA and the uP will release ComPort 3 so
that the host can use it for FPGA communication.
If the host want to reconfigure the FPGA it must toggle the nConfig line on the TIM
site. This will give control of the ComPort back to the microprocessor, but it will not
un-configure the FPGA. If the host then start sending a new bit-stream starting with a
STARTKEY, the FPGA will be un-configured and the new bit-stream will load. If after
toggling the nConfig line, if the host does not want to re-configure the FPGA, it must
send an ENDKEY like described above.
The above structure makes it possible to:
•
Reset only the FPGA in the system and
•
Make sure that the FPGA is not un-configured every time the host application
is re-run as it takes time for the FPGA to re-configure (approximately 35
seconds).
2.11 Analogue output section
Two options are hardwired into the design. The options are shown below with a
figure of each.
Option 1
Single ended AC coupled output with Macom TP-101 transformer.