(no subject)

[Jawad Qureshi]

Hi

I am facing some problems with the pci. I have two questions about Pci.
First is that 
1-how one can explicitly specify to brust on the pci device;
2-We have a custom made pci card . The problem is that the transfer on this
card is slow. I am making 40 double word transfers from the fifoes on the
board to the memory. The pci card does not allow brusts. These transfers are
taking almost 32us. Can any body tell why this much time is taking place.

Thanks in Advance 
Jawad


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Re: Non PCI bursting cards should go to the trash can

[Francois Romieu]

Jawad Qureshi <qureshi_jawad@usa.net> ecrit :
[...]
> I am facing some problems with the pci. I have two questions about Pci.
> First is that 
> 1-how one can explicitly specify to brust on the pci device;
> 2-We have a custom made pci card . The problem is that the transfer on this
> card is slow. I am making 40 double word transfers from the fifoes on the
> board to the memory. The pci card does not allow brusts. These transfers are
> taking almost 32us. Can any body tell why this much time is taking place.

32us/40 = 800ns. PCI at 33MHz, cycle = 33ns -> 24 cycle/access.
The *address* phase of a PCI r/w cycle eats 6 cycles for himself at least.
It looks rather normal.

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