Artesyn iVPX7225 Installation and Use (April 2015) - Manual (Page 75)

Functional Description
iVPX7225 Installation and Use (6806800S11C) 56
4.16 Trusted Platform Module
iVPX7225 provides a (Version 1.2 Compatible) Trusted Platform Module. The TPM is
implemented with Atmel AT97SC3204.
4.17 Real Time Clock
This board supports a battery-backed real-time clock. The PCH contains a Motorola
MC146818B-compatible real-time clock with 256 bytes of battery-backed RAM. The real-time
clock maintains the time of day and stores system data. The RTC operates on a 32.768 KHz
crystal.The VPX VBAT input of the iVPX7225 provides a means to maintain operation when
main power is removed. In the event that a battery voltage is not provided at VBAT, there is a
diode protected 0.2F SuperCap (C214) onboard the iVPX7225 RTM to maintain operation for
short down times. The steady state current draw at VBAT is 6 uA. The minimum hold-up
voltage is 2V.
Other RTC features include two lockable memory ranges for protection of passwords and/or
other system security information as well as a data alarm for scheduling wake up events.
4.18 Watchdog Timer
The watchdog timer (WDT) uses an FPGA watchdog implementation, with a programmable
timeout (16 milliseconds to 8 minutes). The watchdog may be enabled or disabled via BIOS
setup or by software. The BIOS disables the watchdog timer by default. A timeout event causes
a board reset.
A PCH-integrated WDT is also available for use by software. This timeout interval is not
configurable via BIOS setup.
4.19 XMC Support
iVPX7225 hosts one XMC site. The XMC site supports an XMC add-on card. A single x8 (or 2x4
configurable) PCI-E Gen 2 root port routed from the CPU PEG Port 1 (x8) or Ports 1 & 2 (2x4),
lanes 8-15 to the XMC XJ15 connector is used.
The board supports XMC add-on cards with PCI-E link widths of x1, x2, x4, or x8. The board also
supports XMC add-on cards with PCI-E Gen 1 and Gen 2 speeds.