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Dear Sir,
I know the clk of GPIF is 100Mhz,so the best performance is 3.2Gbs(32bit), But I read AN86947,which is a paper for optimizing the throughput of FX3,
In page 5,
Table 2. Performance Summary Results
Transfer Burst length No. of packets Buffer size (KB) No. of buffers Throughput(KB/s)
Isochronous 16 3 48 2 382,700
Bulk 16 NA 48 2 454,300
Interrupt 3 1 3 1 23,900
The throughput of bulk is 454,300 KB, which is faster than 400M byte per second!
So, Which is correct? please see the attached file,an86947_Optimizing_USB_3_EZ_USB_FX3.pdf
David
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Hi,
The Bulk theroghput mentioned in that firmware does not involve the GPIF interface., The data is generated on the DMA of FX3 and is sent over USB. So we get a high throughput.
If the data is transfer is done from the GPIF Interface to USB, the throuput cannot exceed 3.2Gbs
Regards,
- Madhu Sudhan