Hi everyone,

I am using driverstudio to write a device driver for my PCI card,

i don't know how to call up burst mode Read on my PCI card, i try to use one of this method VOID ind(ULONG Offset, PULONG buf, ULONG count); in the declaration of KMemoryRange supplied by driverstudio. It can read in a string of DWORD (32 bits) data but it is not performing burst mode read on the hardware . It is just read in data one by one. My question is : 1. How can i call up burst mode Read in my device driver? Is there any command or method can use , or i need to handle the IRP by my own? 2. By theory , where the data from the PCI board store before reaching my Win32 user program ? Do they store in the RAM before getting by the device driver ? Please give some sample code if it is possible. Thank you very much for you all. _______________________________________________ http://www.opencores.org/mailman/listinfo/pci

To use burst transfers on PCI the PCI card has to be the master, you need to add DMA to your card. I think opencores has a wishbone DMA controller you can use. All the high speed PCI devices have DMA, look at specs for SCSI controllers ect. Anything you code in the device driver will be brocken down to individual reads or writes, because of latency in the system the transfer rate will be slow. good luck ----- Original Message ----- From: tomko81@h... > To: pci@o... > Sent: Saturday, December 06, 2003 6:10 AM Subject: [pci] how to handle burst mode read/write of PCI in device driver
PCI card,
but

try to use

It can read

burst mode

there any

own?

reaching

getting by

To use burst transfers on PCI the PCI card has to be the master, you need to add DMA to your card. I think opencores has a wishbone DMA controller you can use. All the high speed PCI devices have DMA, look at specs for SCSI controllers ect. Anything you code in the device driver will be brocken down to individual reads or writes, because of latency in the system the transfer rate will be slow. good luck ----- Original Message ----- From: tomko81@h... > To: pci@o... > Sent: Saturday, December 06, 2003 6:10 AM Subject: [pci] how to handle burst mode read/write of PCI in device driver
PCI card,
but

try to use

It can read

burst mode

there any

own?

reaching

getting by

The board I have made does not use DMA but it can still have a reasonably fast writes to the board. With a normal PC at 2.4GHz it will have write of about 75MB/s. The burst works quite well. The limitations of transfer speed are in the windows driver and/or in RAM bandwidth. I do not know about read speed because the card hardly uses any. I am using Altera PCI Slave core and a custom made windows driver. Since all modern PC motherboards got DMA circuits that can be programmed to do transfers without CPU, we got plans to rewrite the windows driver and maybe get higher transfer rates. Information about DMA circuits could probably be found in hardware related PC books. The original DMA chip was called 8237A but it is integrated in the chipsets today. A PCI master is a card that can initiate writes and reads by itself without help from CPU or windows software. It is not related to DMA via the 8237A. Regards STB -----Ursprungligt meddelande----- Från: pci-bounces@o... [mailto:pci-bounces@o... ] För tomko81@h... Skickat: den 9 december 2003 12:08 Till: dave@l... ; pci@o... Ämne: Re: [pci] how to handle burst mode read/write of PCI in device driver Thank you very much for your reply. But can you tell me more how to "add" DMA on my PCI core? As for the pci card, how it can communicate with the PC can only through those PCI signal bus. What i don't understand is on the side of motherboard , which type of command and signals need to given by the master PCI so as to know it want to directly write data to memory without involve of CPU? ( i don't mean i don't know the control of those signal like FRAME,IRDY..etc as i have read the spec of PCI). what i guess is the master PCI do normal memory write operation with burst mode and give the address of physical memory on the PC at the address period. This is just my guess and please tell me am i right or not. Regards, TOM ----- Original Message ----- From: "Dave Warren" dave@l... > To: "Discussion list about free,open source PCI IP core" pci@o... > Date: Sat, 6 Dec 2003 11:47:57 -0000 Subject: Re: [pci] how to handle burst mode read/write of PCI in device driver
master,

specs for

be

system the

device

I'm just using write bursts. I do not know if my board can use burst read. The PCI standard and the Altera PCI core can handle it but I do not know if there are limitations in the motherboard hardware that prevent read bursts. I have no clue whether the Opencore PCI can handle read bursts. It should be technically possible to use read busts (in a slave PCI-core) at a PC since Altera has made code for it but I don't know for sure. Sincerely STB -----Ursprungligt meddelande----- Från: tomko81@hotmail.com [mailto:tomko81@hotmail.com] Skickat: den 10 december 2003 02:08 Till: stb@viking2001.se; pci@opencores.org Ämne: Re: [pci] how to handle burst mode read/write of PCI in device driver Thank you for your reply. But my point is that in slave PCI, the write/read process is initiated by others like CPU, i try to read in a string of DWORD in the PCI device driver but it just read in the data one by one and so the speed is slow. I would like to know is there any solution can call out the burst read/write in slave PCI? You say you are using slave PCI but can still perform burst read, how can you do that ? Regards, TOM _______________________________________________ http://www.opencores.org/mailman/listinfo/pci

Hi Stefan,

on PCI you can influent the kind of transfer by setting the command
bit's on the bus. These bit's are laying during addressing phase on the
bus and indicate the desired busmode.
Beneath the single cycle read/write modes there exist two modes for
initiating a burst. They are called 'read cache line' and 'read
multiple'. For writing, no such modes are defined!!
Of course, write bursts occour, but you can't take control over them.
They are assembled by the (intelligent) PCI-bridge into a burst.

If you want to know, how to initiate 'read cache line' or 'read
multiple' transfers (I recomend read multiple) you have to look into
you're description/driver how to influent the C/BE# of your device.

I hope this was helpful for you,

Adalbert


Stefan Bergström wrote:

_______________________________________________ http://www.opencores.org/mailman/listinfo/pci