Nice bit of information at this TI URL:
(My underlining below):
The Programmable Real-time Unit (PRU) is a low-latency microcontroller sub-system comprised of two or more 32-bit RISC processors, local instruction and data RAM, local peripherals and an interrupt controller. The PRU is efficient at handing events that have tight real-time constraints. The PRU is also known as the Industrial Communications Sub-System since it is used to enable industrial protocols such as EtherCATÂ, EtherNet/IPâ„¢, PROFINET, PROFIBUS, POWERLINK, SERCOS III, and others. Each 32-bit processor runs at 200MHz, enabling 5ns instruction cycle. Local peripherals within the PRU sub-system include UART, eCAP, MII_RT, MDIO and IEP. The PRUâ€s fast input and output pins enable detection and reaction to I/O events within two PRU cycles.
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