Sundance SMT335E - Manual (Page 29)

Version 1.5 Page 29 of 53 SMT335E SMT375E User Manual
Reading from the Global Bus
First specify the trigger value in the Operation Register as described above. At the
same time that you set the trigger you must also set the OPERATION bit to 0
indicating that data is to go to the C6000 from the global bus. Setting OPERATION to
0 will start a transfer of data from the external device into the DPR.
As soon as the external device has moved TRIGGER+1 words, the transfer will stop
and the FPGA will set the DONE flag in the Global Bus Control Register, signalling
an interrupt condition. You can use this condition to interrupt the C6000 or
synchronise a DMA transfer.
Once DONE has been set, you may read data out of the DPR. When the FPGA
detects the C6000 reading the trigger word, it will examine the AUTORESTART bit in
the Global Bus Control Register. Another frame transfer from the external device will
start if AUTORESTART is 1; no action will be taken if the bit is 0.