Question of GPMC and DMA of Quicklogic CSSP.

WeiJiang

Dear all,

QuickLogic® has developed a Customer Specific Standard Product (CSSP) to provide a camera interface bridge for the Texas Instruments Sitara AM335x processor line. Below it is the datasheet:

www.quicklogic.com/.../QL-GPMC-CAMIF-Connect-Solution-TI-Ref-Design-Data-Sheet.pdf

My question is:

1. “The system must configure GPMC as 16-bit to take advantage of the DMA burst capability.” Why? Did this mean 8-bit GPMC can't take the advantage of the DMA burst capability? The burst capability of here means the burst mode of GPMC or DMA?

2. "Only bit [7:0] of the GPMC bit [15:0] address/data bus is connected to valid data." Then how did the DMA dropped the bit[15:8] while the data transfering. I mean how to set the DMA params to drop the high bits of GPMC bus? I read the source code of github and got no idea.

Thanks, Waiting for your help.

over 9 years ago

0 WeiJiang over 9 years ago

Expert 1080 points

github.com/.../beaglebone-3.2
www.quicklogic.com/.../

0 Biser Gatchev-XID over 9 years ago

TI__Guru**** 393215 points

Hi,

This is a third-party product and TI cannot comment on their documentation. However on your questions:

1. AM335X does not support burst mode on 8-bit devices connected to the GPMC.
2. High byte is simply not used.

0 WeiJiang over 9 years ago in reply to Biser Gatchev-XID

Expert 1080 points

Hi Biser:
Thanks a lot. my question:
1. how to set dma params to get 8-bit or 16-bit GPMC data? what's the diffrence of DMA params between 8-bit and 16-bit GPMC? which param of DMA affect the GPMC data width? Is it the "FIFO Width"(Bit 10-8) of the Register OPT(Channel Options Parameters)?
2. the ACNT of DMA transfer setting is 32. why 32 is used in here? how can I get the ACNT and BCNT params in here?
github.com/.../0072-beaglebone-add-support-for-QuickLogic-Camera-interfa.patch
thanks again.

0 Biser Gatchev-XID over 9 years ago in reply to WeiJiang

TI__Guru**** 393215 points

Please direct Beaglebone software related questions to the community at: beagleboard.org/.../Forums

0 Eddie Ferrufino over 9 years ago in reply to Biser Gatchev-XID

Prodigy 30 points

Has anyone had any luck purchasing QuickLogic CSSP chips for integration into their design? I'd like to get this product integrated into my design but I can't get in touch with anyone there. Does anyone have a good email for the sales team at quicklogic?

Thanks

Eddie

0 Biser Gatchev-XID over 9 years ago in reply to Eddie Ferrufino

TI__Guru**** 393215 points

This is the company info we have: www.ti.com/.../companyfolder.tsp

0 Eddie Ferrufino over 9 years ago in reply to Biser Gatchev-XID

Prodigy 30 points

The contact information listed on that website is no good....all emails are returned as undeliverable. Consider updating or deleting. I am trying to make contact with the new sales rep at Quicklogic with no success...