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Visitor lannylian
Visitor
426 Views
Registered: ‎12-01-2017

Migrating a streaming design on AWS F1 from IPI flow to SDAccel flow

I have a streaming design on AWS F1 that was initially developed using the IPI flow. In this design, the host streams data to/from the CL using the PCIS AXI4 interface. This was achieved by having the CL monitoring the PCIS AXI4 interface — the CL sees the write and read channels of the PCIS and streams in and out data correspondingly. The CL consumes as much data as the host streams to it, and produces a variable size of output data that is to be read by (streamed to) the host. So the host reads a register value via BAR1 AXI-L interface to know the amount of data to be transferred back before starting the read on PCIS.

Now we need to port this design into the SDAccel environment and plan to convert the existing CL design into an RTL kernel. I have two immediate questions, hoping someone can give some pointers.

1) Is there a way in SDAccel to allow the host directly stream data to/from an RTL kernel, without having to store the data in DDR (global memory)?
2) Can the host read a scalar value back from the kernel, so that the host knows how much data to transfer back when the output size is variable?

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Moderator
Moderator
399 Views
Registered: ‎11-04-2010

Re: Migrating a streaming design on AWS F1 from IPI flow to SDAccel flow

Hi, @lannylian ,

Currently "Host direct reads/writes data from a kernel" function is not supported in SDAccel. 

 

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Visitor lannylian
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390 Views
Registered: ‎12-01-2017

Re: Migrating a streaming design on AWS F1 from IPI flow to SDAccel flow

Hi @hongh, is there a way for the host to read a scalar value back from the kernel (like a return value of a kernel function)?
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Moderator
Moderator
373 Views
Registered: ‎11-04-2010

Re: Migrating a streaming design on AWS F1 from IPI flow to SDAccel flow

Hi, @lannylian , 

The data in my last post includes both vector and scalar data. It's the limitation of the existing platform.

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