Altera FPGA SRAM Programming

[m_llaa]

iord_32direct

Hi
I am working with Altera FPGA, Stratix II EP2S60 with IDT SRAM, but i cant find any documents about sram programming in nios, for example writing 1 word in known address in nios environment.
thanks

 

[m_llaa]

iowr_32direct

I find 2 macros, IOWR_32DIRECT() and IORD_32DIRECT()
I can write to my ram by IOWR_32DIRECT() but I cant read from it by IORD_32DIRECT()

IOWR_32DIRECT(BASE,OFFSET,DATA);
IORD_32DIRECT(BASE,OFFSET);
any guide?
thanks

 

[samuraign]

fpga sram

Hi,
Under Alter installation ,find the standard directory and use the
standard qpf file in SOPC builder and try to access ur SRAM using Nios IDE.

 

[BGAman]

iowr_32direct altera

I'm using memory type Avalon interface for buffers and other memories not register type. Macros IOWR..., IORD... are dedicated for register type inteface. I'm using pointers like " unsigned short* ScopeBufPtr = (unsigned short*) SCOPE_0_SCOPEBUFFER_BASE; ", where base adress SCOPE_0_SCOPEBUFFER_BASE generated by SOPC builder can be found in "system.h" file. Then simply use W = *ScopeBufPtr; etc... Hope this helps. Regards Paul.

 

[m_llaa]

altera macro iowr

Hi BGAman
Thanks for your comment.
Is it any different between IOWR( ) and IORD( ) macros and writing and reading with pointer?
I used those macros but I had problem in reading. if delay between writing and reading increase, I can just read 0xffffffff