Related Products:
MM-6795C - 64MB VME/VME64 NVRAM Memory Module
MM-6795F - 256MB VME/VME64 Non-Volatile FLASH module
MM-6790C - 32MB High-Speed CMOS NVRAM and 64MB Flash Memory VME/VME64 Card

MM-6790F 64MB CMOS NVRAM and 256MB Flash Memory VME/VME64 Card


  • Capacity - CMOS NVRAM: 16, 32, 64MB; Flash Memory: 32, 64, 128, 256MB
  • On-board timer provides 1 usec to 16 msec in 1 usec increments for Flash timing requirements
  • Compatible with VME/VME64 A32/A24/D64/D32/D16/D8 (UAT) (BLT) (MBLT)
  • Data retention for CMOS, 3 years with lithium batteries, 4 weeks with rechargeable NiCad batteries
  • Cycle/Access Time - CMOS NVRAM: 150/100 nsec; Flash memory: 200/150 nsec (read only mode)
  • Block Transfer of 256 bytes for VME and 2KB for VME64
  • Two on-board, redundant, fused lithium or NiCad batteries
  • Module Selection on 1MB boundaries, switch-selectable

The MM-6790F is a high speed, non-volatile memory board using various combinations of CMOS NVRAM and Flash memory. The board is completely compatible with VME/VME64 and has a data transfer rate of 64 MB/sec. Boards operate with block transfer (BLT) of 256 bytes for VME and 2KB for VME64 (MBLT).

A Flash memory software driver example is provided on a floppy diskette along with a sample listing in "C" code.

With CMOS NVRAM the MM-6790F has two on-board, redundant, fused batteries to backup the memory in case of a power loss. Batteries may be either rechargeable NiCad or non-rechargeable lithium types. On-board LEDs and a control status register indicate battery condition.

Reliability is ensured by burn-in and running memory diagnostics that check operation for 48 hours while temperature-cycling boards between 0 and 65°C.

Last updated: Sep 24 2007, 11:03PM