= VME64x =
''VME64x'' or ''VME64 Extensions'' is the further enhancement of the VME64 standard. VME64x is defined in ''ANSI/VITA 1.1-1997'' standard.

The brief information on VMEbus may be found on official [[http://www.vita.com/vmefaq.html|VME technology FAQ]] page.
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VMEbus major enhancements specified in VME64 standard:

 1. 64 bit data and address capability
 1. Locks, Configuration ROM / Control & Status Registers (CR/CSR)
 1. rescinding DTACK*
 1. Auto system control detection, auto slot ID
 1. Optional shielded DIN connectors

VME64 Extensions:

 1. 160 pin P1/J1, P2/J2 connectors. "z" and "d" rows added
 1. Optional 2 mm hard metric 95 signal pin plus 19 or 38 ground pins P0/J0 connector for more user I/O
 1. +3.3V and auxiliary supply, more +5V power
 1. 35 more signal ground returns on P1/J1, P2/J2
 1. 46 more user defined I/O pins on P2/J2.
 1. 14 bused spare pins and 2 unbused spare pins on P1/J1 reserved for future
 1. Test and maintenance bus pins
 1. Slot geographical addressing
 1. Mechanical support for EMC and ESD control
 1. Solder side covers with ESD protection
 1. An injection/extraction handle with a locking feature
 1. User installed board to slot keying
 1. Alignment pin for keying, alignment, and ESD/EMC protection
 1. Front Panel Safety Ground
 1. Reserved area on the front panel for ID and/or bar code labels
 1. Rear I/O transition boards
 1. Added CR/CSR definition
 1. Live insertion specifications
 1. 2eVME: two-edge protocol