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PCI burst writes to OPENCORE PC slave are STOPed after6words.
by Unknown on Oct 19, 2004 |
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Hi Miha,
My PCI fifo size was 128 words, also it is not shared so 6 seems a small
number for the burst. I will recompile with 256 words to see if the burst
size changes.
`define PCI_FIFO_RAM_ADDR_LENGTH 7
`define PCI_RAM_DONT_SHARE
regards
Dave Warren
----- Original Message -----
From: "Miha Dolenc" mihad@opencores.org>
To: "Discussion list about free, open source PCI IP core"
pci@opencores.org>
Sent: Tuesday, October 19, 2004 8:24 AM
Subject: Re: [pci] PCI burst writes to OPENCORE PC slave are STOPed
after6words.
Hi!
Have you tried increasing the FIFO size?
Regards,
Miha Dolenc
----- Original Message -----
From: "Dave Warren" dave@luscher.co.uk>
To: pci@opencores.org>
Sent: Monday, October 18, 2004 4:53 PM
Subject: [pci] PCI burst writes to OPENCORE PC slave are STOPed after
6words.
>
> I have the PCI core configured as a PCI slave, wishbone master. The transfer
> rate for large burst transfers is disappointing. My PCI bus is clocked
at
> 33Mhz, wishbone at 40Mhz. Data is written by an external PCI master
which
> can write long bursts, up to 256 words. The PCI target is the OPENCORE
PCI
> bridge, the wishbone target is an internal FIFO which means no wait
states.
>
> However after six words have been written the OPENCORE PCI generates STOP
> halting the transfer. The external master starts another burst, this
also
is
> STOPped after six words. So my overall PCI data rate is very poor.
>
> Is there any way to get longer bursts to work?
>
> Dave Warren
>
> dave@luscher.co.uk
>
>
> _______________________________________________
> http://www.opencores.org/mailman/listinfo/pci
_______________________________________________
http://www.opencores.org/mailman/listinfo/pci
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