Programmable Devices
CPLDs, FPGAs, SoC FPGAs, Configuration, and Transceivers
20733 Discussions

PCie BAR to memory mapped slave

Altera_Forum
Honored Contributor II
‎04-16-2017 04:23 AM
1,101 Views

hi guys!! 

 

Well, I've got trouble with sending a some data to memory mapped slave.  

My PCIe just has one BAR. 

That Bar has a size of 4kbytes - 12 bits and my memory mapped slave has a 10 bits of address width and 32 data width  

(memory mapped slave has address are 0x0000_0000 to 0x0000_0fff). 

 

So my questions are: 

1.- if I want to send data to memory slave, How should I fill BAR?:confused:....... Bar has size of 4KBytes and I dont know which bits are of datas and address. 

2.- Why dooes BAR has 12 bits if my memory mapped slave has 10 bits??:confused: 

 

Well, Iill be thanking for your replys!!
0 Kudos

Link Copied

1 Reply
Altera_Forum
Honored Contributor II
‎04-17-2017 10:27 PM
309 Views

The BAR is for bytes. Your memory is four bytes. 

Memory address of 10 bits plus 2 bits to address the byte = 12. 

 

Dave
0 Kudos
Copy link
Reply

Community support is provided during standard business hours (Monday to Friday 7AM - 5PM PST). Other contact methods are available here.

Intel does not verify all solutions, including but not limited to any file transfers that may appear in this community. Accordingly, Intel disclaims all express and implied warranties, including without limitation, the implied warranties of merchantability, fitness for a particular purpose, and non-infringement, as well as any warranty arising from course of performance, course of dealing, or usage in trade.

For more complete information about compiler optimizations, see our Optimization Notice.