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diablocm
Newbie
Newbie
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Registered: ‎05-17-2008

Write interval in OPB_EMC

hi

I use OPB_EMC 2.00a with Central DMA to control the DM9000b;

I find that when I use DMA, the EMC write interaval time is not enough

I need WEN vaild to next WEN vaild is 100ns, and the WEN pulse width is 20ns ( the clk period is 20ns with 50Mhz OSC )

 

WEN ~~~~~~~~~~~|_|~~~~|_|~~~~~~~~~~

I try to set  

C_TCEDV_PS_MEM_0 = 20000

C_TAVDV_PS_MEM_0 = 20000

C_THZCE_PS_MEM_0 = 7000

C_THZOE_PS_MEM_0 = 7000

C_TWC_PS_MEM_0 = 20000

C_TWP_PS_MEM_0 = 20000

C_TLZWE_PS_MEM_0 = 6000

but can't get the wave I want

 

How could I set the EMC params?

 

3x

 

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