Am Dienstag, 25. November 2014 16:11:52 UTC+1 schrieb TJF:
>
> There're just a few header pins usable for PRUSS low latency GPIO, when 
> LCD isn't disabled. All other GPIOs can get accessed over the OCP master 
> port with 2 or 3 cycles of latency.
>

According to 
http://e2e.ti.com/support/arm/sitara_arm/f/791/p/384515/1356079.aspx the 
latency is much higer. For PRU-mapped GPOs there are two cycles (of 200 MHz 
of PRU), for GPOs accessed via global address space it is even more higher.

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