- device to device communication across southbridge
- Posted by John Rivers on September 20th, 2007
is it possible for one device (let's say hard disk controller) to send
data directly to another device (say gpu or usb controller) directly
without using the northbridge, ram or cpu ?
for example
it would be very efficient if an application could tell the hard disk
controller to send some blocks of video data directly to the gpu for
decoding and display
ie: not going via the system ram
- Posted by Stephan Wolf [MVP] on September 21st, 2007
DMA is the key, see e.g.
http://en.wikipedia.org/wiki/Direct_memory_access
Stephan
---
On Sep 20, 6:19 pm, John Rivers <firs...@btinternet.com> wrote:
- Posted by Calvin Guan on September 23rd, 2007
With current pcie implementation, if 2 devices root at the same RC,
Device-device dMA is possible.
--
Calvin Guan
Principal Engineer
Broadcom Corporation
Connecting Everything(r)
"Stephan Wolf [MVP]" <stewo68@hotmail.com> wrote in message
news:1190386335.365157.153570@22g2000hsm.googlegro ups.com...
- Posted by John Rivers on September 27th, 2007
hi
that is good news
i suppose it is meaningless without operating system support
do you know if any os supports detecting that capability
and automatically "short circuiting" the normal procedure
which (i am guessing) involves dma from source device to system ram
then another dma from system ram to target device
best wishes
john
On 23 Sep, 23:05, "Calvin Guan" <hg...@nospam.broadcom.com> wrote:
