That sounds typical for ARM based SoC designs. AMBA is simply the name around all those buses like AHB and so on.
AHB is actually a bus from the set of buses within AMBA. Bulk transfer is a term from AHB.
RGMII => Reduced Gigabit Medium Independent Interface. Detailed information just within the IEEE 802.3 specifications.
"cipher core" sounds like it has hardware encryption support for hard drive encryption.
How was the registration process done on PLX page? Just in case.
But, I suppose I keep it the unsigned way since I can document every single finding publicly then. No entanglement in that case.