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PCI burst writes to OPENCORE PC slave are STOPed after 6words.
by Unknown on Oct 19, 2004 |
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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
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