1
Discussion - Hardware / FT600q communication problem
« on: January 18, 2024, 05:46:40 PM »
Hi
I would need continuous communication between the IC and the PC, at a speed of 160MB/sec. There is no problem with the speed, but the communication between the IC and the data source is not continuous, but intermittent!
I am currently using a test environment for testing. Here, I upload the data to the IC at a speed of 100MHz, and this is continuous for 20.47usec. Then in each case comes an approx. 0.5-1usec pause in reception (TXE_N=1), after which the whole cycle starts again.
The time of 20.47usec matches the size of the internal FIFO (1 channel out, 1 channel in direction = 2048 words), but I don't understand why there is a little pause afterwards??!
But that's the minor problem. The biggest one is that in stream mode, when the value set on the FT_SetStreamPipe API is reached, a pause occurs again (TXE_N=1), but this lasts for about 10usec! Whatever size is specified for the ulStreamSize parameter, there is always a pause of approx. 10usec at the end!
This is quite a problem, because the data source requires continuous communication, and the bigger the pause in the communication, the bigger the buffer I have to use to bridge these pauses.
This big pause is there even if I used my own test program and even if I tested it in the FT600DataStreamerDemoApp program!
Does anyone have an idea of what causes these regular pauses? And is there any way to eliminate them? But at least the goal would be to eliminate the 10usec pause...
Thanks
I would need continuous communication between the IC and the PC, at a speed of 160MB/sec. There is no problem with the speed, but the communication between the IC and the data source is not continuous, but intermittent!
I am currently using a test environment for testing. Here, I upload the data to the IC at a speed of 100MHz, and this is continuous for 20.47usec. Then in each case comes an approx. 0.5-1usec pause in reception (TXE_N=1), after which the whole cycle starts again.
The time of 20.47usec matches the size of the internal FIFO (1 channel out, 1 channel in direction = 2048 words), but I don't understand why there is a little pause afterwards??!
But that's the minor problem. The biggest one is that in stream mode, when the value set on the FT_SetStreamPipe API is reached, a pause occurs again (TXE_N=1), but this lasts for about 10usec! Whatever size is specified for the ulStreamSize parameter, there is always a pause of approx. 10usec at the end!
This is quite a problem, because the data source requires continuous communication, and the bigger the pause in the communication, the bigger the buffer I have to use to bridge these pauses.
This big pause is there even if I used my own test program and even if I tested it in the FT600DataStreamerDemoApp program!
Does anyone have an idea of what causes these regular pauses? And is there any way to eliminate them? But at least the goal would be to eliminate the 10usec pause...
Thanks