new component tutorial, byteenable inputs are not t responding

Altera_Forum · ‎01-05-2014

HI,

I practiced the tutorial named Making Qsys Components, and have questions regarding the byteenable.

(linked it following line)

ftp://ftp.altera.com/up/pub/altera_material/12.0/tutorials/making_qsys_components.pdf

how do I address(controll) the byteenable inputs ?

i programed my DE2-115 board according to the manual, and used eclipse to test the resolutes.

i used the function :

IOWR_16DIRECT(REG16_AVALON_INTERFACE_0_BASE, 0, 0x2222);

to write to the register ,

i changed the address (base + offset of 0,1,2,3,4) to control byteenable but it seems that bouth bytes are enabled all of the time (until the address gets to base addres +offset of 4)

if i would like to disenable 1 of the bytes what should i do?

thanks in advance

Yakir

Altera_Forum · ‎01-07-2014

Is you peripheral 16-bit data wide? You should use IOWR_8DIRECT() to access individual bytes, or use a unsigned char or char pointer with cache bypassing.