XVME-6300
6U VME Intel i7 Core Processor Board
Acromag, Inc. Tel: 248-295-0310
- 24 -
www.acromag.com
Programming
CPU Turbo Mode
The Intel i7 processors have a Turbo Mode feature that is essentially an ‘on-demand’ overclocking mechanism that
can run the CPU temporarily faster than the maximum rated CPU frequency when both cores of the CPU are not
100% utilized. This mode of operation results in large instantaneous dynamic swings in power supply current. As a
result, spurious resets of the board may be experienced with Turbo Mode enabled if the power supply and/or
backplane combination are insufficient.
Turbo Mode can be enabled/disabled in the BIOS setup. It can be found in the Advanced > Thermal Configuration
screen.
Note
With Turbo Mode enabled a power supply and/or backplane combination incapable of
supplying large instantaneous current surges may result in spurious resets of the board.
VME Interface
The VME interface is the Tundra TSI-148 chip, which is a PCIbus-to-VMEbus bridge device. The XVME-6300
implements a 64-bit PCI-X bus and a 32/64-bit VMEbus interface. The TSI-148 chip configuration registers are
located in a 4 KB block of PCI memory space. This memory location is programmable and defined by PCI
configuration cycles. The VMEbus controller has four main functions; system resources or the “traffic cop of the
bus”, master interface which “starts conversation on the bus”, slave interface which responds to a bus master’s
question and the interrupt functions which uses seven levels of interrupt control.
Note
For your frame of reference, the left side below is the XVME-6300 board and the right side below is the VMEbus.
PCI memory slave access = VMEbus master access
PCI memory master access = VMEbus slave access
