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Honored Contributor I
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altasmi_parallel page writes

Consulting: 

http://www.altera.com/literature/ug/ug_altasmi_parallel.pdf 

 

I have implemented the timing on page 11/ figure 11 (aka; Example 2) 

 

I have the PAGE_SIZE parameter set to 256 and thus I have 256 shift_bytes/wren/datain 

toggles before later asserting write/wren/addr after which busy is asserted for many cycles 

thereafter indicating a write to the EPCS. 

 

Problem is I read back the data as all 0xFF's. 

 

Prior to implementing page writes I performed single writes (disabled page writes 

in the mega fcn) and this worked (but took a long time naturally). 

 

Any ideas why page writes not working here? 

Is Figure 11 timing correct? 

I presume this is still a page size of 8 but only the first four bytes written with the rest  

left as 0xFFs. 

Does wren need to be asserted through the whole page write(and not toggle)? 

 

Using EPCS128. 

 

 

Thanks, 

 

Cos
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