On 04/24/2019 02:53 AM, Gregg Eshelman via Emc-users wrote:
What about ECP mode, which requires DMA?
ECP mode is great for long, continuous transfers, like a
printer or scanner. For CNC motion control in the LinuxCNC
scheme, there will be pretty short transfers in each
direction, so the DMA really doesn't help much. Modern CPUs
with PCI or PCIe can transfer somewhere around 1.6
MByte/second in the burst, and a whole servo thread can
complete in around 100 us, including read hardware state, do
PID computation and write new velocity, etc.
Jon
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