Ask the Community
Close
Ask the Community
nav search Icon
Forums gray-arrow gray-arrow
Resources gray-arrow gray-arrow
About gray-arrow gray-arrow
Groups gray-arrow gray-arrow
nav-user Account

Tip / Sign in to post questions, reply, level up, and achieve exciting badges. Know more

cross mob

FX3 SlaveFIFO 32-bit Mode Not Working

lock attach
Attachments are accessible only for community members.
Log in arrow right alert

FX3 SlaveFIFO 32-bit Mode Not Working

nluong
Level 1
Level 1
First reply posted First question asked Welcome!
‎Dec 01, 2021 11:24 AM
‎Dec 01, 2021 11:24 AM
Jump to solution

Hello,

I am trying to use the FX3 SlaveFIFO in 32-bit mode for automatic DMA transferring. I am able to fill up the buffers and send data to the host, however I noticed half of each of the 32-bit words are missing. This leads me to believe it is operating in 16-bit mode. 

Am I missing a configuration somewhere? Note I have setSysClk400 set to True.

For reference, see main C source file that implements this. The project is a modification of AN75779 firmware, and uses the GPIF design from AN65974.

Thanks,

Nicholas

uvc.zip
0 Likes
Subscribe
1 Solution

Re: FX3 SlaveFIFO 32-bit Mode Not Working

JayakrishnaT_76
Moderator
Moderator
Moderator
First question asked 1000 replies posted 750 replies posted
‎Dec 01, 2021 07:05 PM
‎Dec 01, 2021 07:05 PM
Jump to solution

Hello Nicholas,

Please answer the following questions so that we can understand the issue better:

1. Please elaborate the following statement in your description:

"however I noticed half of each of the 32-bit words are missing"

Does this mean that if the FPGA (or master) is sending 0xABCDEF00 for one PCLK, then only 0xEF00 is captured by FX3 and the remaining data is lost? Please let me know if my understanding is correct or not. If my understanding is correct, then please let me know how this was confirmed. If my understanding is wrong, then please feel free to correct me.

2. I find that the #define CY_FX_SLFIFO_GPIF_16_32BIT_CONF_SELECT is used to switch between 16 bit and 32 bit interface. But, I find that CyU3PGpifLoad () is always called with the same configuration irrespective of the value of CY_FX_SLFIFO_GPIF_16_32BIT_CONF_SELECT. Please let me know if the second word of GPIF register values is changed based on the value of CY_FX_SLFIFO_GPIF_16_32BIT_CONF_SELECT. This is needed to switch between 16 and 32 bit interfaces. You can refer to the cyfxgpif_syncsf.h in the default Slave FIFO project to understand this change better.

Best Regards,
Jayakrishna

View solution in original post

0 Likes
3 Replies