Variable read rate

Hi all,

I have an SOPC build custom component which output some data and is readback by NIOS II.

After integrating into the FPGA system, I noticed that the data read back has a varying read rate.

For example: If the data is: 1,2,3,4,5,6,7,8,9 , the NIOS will read as: 1,3,6,8. NIOS II skip one or two or three samples.

Could anyone tell me why Nios is not reading the value back at a constant flow. (i.e. read 1,3,5,7,9)?