Real-Time Clock/NVRAM/Watchdog Timer
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4-13
4
Note
You cannot use 3.3V and 5V PMCs together; the voltage keying
pin on slots 1 and 2 must be identical. When in 5V mode, the bus
runs at 33 MHz.
In addition, the PMC connectors are located such that a double-width PMC
may be installed in place of the two single-width PMCs.
In this case, the MVME6100 supports:
Note
On either PMC site, the user I/O – Jn4 signals will only support
the low-current, high-speed signals and not for any current
bearing power supply usage. The maximum current rating of
each pin/signal is 250 mA.
Real-Time Clock/NVRAM/Watchdog Timer
The real-time clock/NVRAM/watchdog timer is implemented using an
integrated SGS-Thompson M48T37V Timekeeper SRAM and Snaphat
battery. The minimum M48T37V watchdog timer time-out resolution is
62.5 msec (1/16s) and maximum time-out period is 124 seconds. The
interface for the Timekeeper and SRAM is connected to the MV64360
device controller bus on the MVME6100 board. Refer to the MV64360
Data Sheet, listed in
Appendix C, Related Documentation
, for additional
information and programming details.
Mezzanine Type:
PMC = PCI Mezzanine Card
Mezzanine Size:
Double width and standard depth
(150mm x 150mm) with front panel
PMC Connectors:
J11, J12, J13, J14, J21, J22, J23, and J24
(32/64-bit PCI with front and rear I/O)
Signaling Voltage:
VIO = +3.3V (+5V tolerant) or +5V, selected by keying
pin