Max Frequency of 64-Bit Timer Plus (tms320c6748)

I've reviewed several resources and just want to verify if I understand correctly what the maximum speed of the 64-Bit Timer is.  I'm controlling a tms320c6748.  Looking at the OMAP-L138 C6-Integra™ DSP+ARM® Processor Data Sheet Ch 5.30.1 (p.255) lists the Timer Input minimum cycle time as 4*P where P = OSCIN cycle time in nsec.

OSCIN is limited to 12 to 30 MHz (Ch 5.5 p 87) meaning the counter is limited to 3 to 7.5 MHz.  Am I correct?

I couldn't find timing specs for the eCAP devices, but even if they are fast enough (I'd like >66 MHz) 3 signals are too few.  I need to count frequency on 4 signals and require 5 counters each with a 2 to 4 capture registers.

Please let me know if I have the specs correct.