wintel

["Daniel DeConinck" <daniel.deconinck@sympatico.ca>]

Hello,

 

(Please correct any misunderstanding you see. Thanks)

 

I am designing a PCI frame grabber. I want to xfer digital video to the host in a wintel enviroment via the PCI bus.

 

I understand that the CPU ( in a wintel enviroment) can not 'BURST' read.

 

This gives it a max xfer rate of 33MB/S. (Since it takes four clks per read versus one clock per read in burst mode.)

 

If the CPU executes a MOVS command, will it do max bandwidth (33MB/S) reads? I ask because a MOVS requires a write for every read to complete the 'move'. Assume the destination of the MOVS is motherboard main memory. Will the CPU write to main memory, simultaneously while performing the next read across the CPU bus ?

 

In other words. 'what is the max xfer rate of a MOVS command in a wintel enviroment from a PCI target to main memory'?

 

 

If I design my PCI card as a master can it burst write to the main memory in a wintel enviroment ? Will this occupy any of the CPUs time other than tying up the PCI bus ?

 

 

Sincerely

Daniel DeConinck

High Res Technologies, Inc.